You’ve got an interview coming up, and your palms are already sweating. We’ve all been there—refreshing that email inbox, googling “common interview questions” at 2 AM, and wondering if you’re actually prepared. Here’s the good news: you don’t need to drop hundreds of dollars on interview coaching to nail your next opportunity.
Affiliate Disclosure: This post may contain affiliate links, which means we may receive a commission if you click a link and purchase something we’ve recommended. This comes at no extra cost to you.
In this guide, I’m sharing the 10 best free interview prep resources that’ll help you walk into any interview room with confidence. Whether you’re a recent grad hunting for your first role or a seasoned professional making a career switch, these interview question banks and preparation platforms have got you covered. You’ll learn about platforms offering everything from technical coding challenges to behavioral question practice, complete mock interviews, and even AI-powered feedback systems.
Ready to transform those interview jitters into interview confidence? Let’s dive in.
Why Interview Preparation Actually Matters
Let’s be real—winging an interview rarely works out well. According to LinkedIn’s research, 93% of hiring managers say that properly prepared candidates stand out immediately. The difference between a candidate who practiced and one who didn’t? It’s painfully obvious within the first five minutes.
Interview preparation isn’t just about memorizing answers to common questions. It’s about building the muscle memory to communicate your value clearly, handling curveballs with grace, and projecting genuine confidence. When you’ve practiced articulating your experiences dozens of times, you’ll sound natural instead of rehearsed. You’ll catch those tricky behavioral questions that used to trip you up, and you’ll actually have compelling stories ready to showcase your skills.
The stakes are high, too. One study found that 47% of candidates are rejected within the first five minutes of an interview due to poor preparation. But here’s the encouraging part: preparation is the great equalizer. You might not have the most impressive resume in the stack, but if you can tell your story compellingly and answer questions with clarity and confidence, you’ll leave a lasting impression that paper credentials simply can’t match.
How We Chose These Resources
I didn’t just google “free interview prep” and call it a day. Each resource on this list was evaluated based on real-world usability, actual user feedback, and the genuine value it provides without requiring your credit card.
Our criteria included: breadth of question coverage, quality of feedback mechanisms, user interface design, community ratings, and whether the “free” version is actually useful (not just a glorified teaser). We prioritized platforms that offer substantial free tiers—resources you can genuinely use to prepare for interviews without hitting a paywall after five minutes. We also considered different interview types: technical interviews, behavioral questions, case studies, and industry-specific preparation.
Quick Comparison Table
| Resource | Best For | Starting Price | Rating | Key Feature |
| LeetCode | Technical coding interviews | Free (Premium: $35/mo) | 4.6/5 | 2,500+ coding problems |
| Glassdoor Interview | Company-specific questions | Free | 4.4/5 | Real interview questions from actual candidates |
| Pramp | Live mock interviews | Free | 4.7/5 | Peer-to-peer practice sessions |
| InterviewBit | Software engineering prep | Free (Pro: $99/year) | 4.5/5 | Structured learning paths |
| Big Interview | Behavioral interview practice | Free trial (Paid: $79) | 4.3/5 | Video practice with AI feedback |
| Exponent | PM and tech interviews | Free (Premium: $25/mo) | 4.8/5 | Expert interview videos |
| Interviewing.io | Anonymous mock interviews | Free | 4.6/5 | Practice with real engineers |
| CareerCup | Interview question database | Free | 4.2/5 | 14,000+ questions across industries |
| HackerRank | Technical assessments | Free (Enterprise: Custom) | 4.5/5 | Company-specific prep tracks |
| Indeed Interview Questions | Industry-wide prep | Free | 4.3/5 | Massive question database by job title |
1. LeetCode – The Gold Standard for Technical Interview Prep
What is LeetCode?
LeetCode is the undisputed heavyweight champion of coding interview preparation. Founded in 2015, this platform has become the go-to resource for software engineers preparing for technical interviews at companies like Google, Amazon, Facebook, and Microsoft. It’s essentially a massive database of algorithmic coding problems that mirror what you’ll face in real technical interviews.
Key Features
- 2,500+ coding challenges ranging from easy to hard difficulty levels
- Company-specific question lists showing what actual companies ask in interviews
- Discussion forums where you can see multiple solution approaches for each problem
- Built-in code editor supporting 14+ programming languages
- Contest mode for timed practice that simulates real interview pressure
- Solution explanations from the community with complexity analysis
- Progress tracking to monitor which topics you’ve mastered
Use Cases
Perfect for the software engineer who just landed a Google phone screen and needs to brush up on dynamic programming. Also great for computer science students preparing for campus recruitment—you can filter problems by difficulty and topic to build skills progressively. If you’re switching from web development to a more algorithm-heavy role, LeetCode’s structured problem sets help you level up systematically. Bootcamp graduates use it to fill gaps in their data structures and algorithms knowledge before applying to competitive tech companies.
Who Should Use LeetCode?
Ideal for software engineers at any level preparing for technical coding interviews. Whether you’re a new grad facing your first FAANG interview or a senior engineer who hasn’t interviewed in five years, LeetCode meets you where you are. It’s particularly valuable for self-taught developers who need structured algorithm practice, and for anyone interviewing at tech companies known for rigorous coding assessments.
Why Choose LeetCode?
First, it’s become the industry standard—hiring managers literally use LeetCode-style questions in actual interviews. Practicing here means you’re training with the same equipment used in the game. Second, the community is incredibly active. For almost any problem, you’ll find multiple solution approaches explained in detail, which means you’re not just memorizing answers but actually understanding different ways to think about problems. Third, the company-specific tags let you laser-focus your preparation on what specific employers actually ask.
Pricing
Free Plan: Access to 50+ problems, basic discussion forums, and solution viewing (limited)
Premium Plan: $35/month or $159/year (saves you $261/year) includes all 2,500+ problems, company-specific questions, video solutions, and autocomplete debugger
Student Discount: 25% off with valid .edu email
The free tier alone provides enough practice for solid interview preparation, though premium unlocks company-specific lists that can be game-changers.
Pros and Cons
Pros:
- Massive question database covering every conceivable algorithm topic
- Questions are verified to match real interview formats
- Active community providing multiple solution perspectives
- Progress tracking keeps you motivated
- Company tags help you prepare strategically
Cons:
- Can feel overwhelming for complete beginners
- Premium features are pricey if you’re on a tight budget
- Some explanations assume prior knowledge
User Ratings
4.6/5 stars on G2 (based on 890+ reviews) — View reviews on G2
One standout review: “LeetCode transformed my interview preparation from random practice to strategic skill-building. Landed my dream job at Microsoft after three months of consistent practice.”
How to Use LeetCode
- Start with the “Top Interview Questions” list to tackle the most commonly asked problems first
- Choose a programming language you’re comfortable with (or the one your target company uses)
- Begin with Easy problems even if you’re experienced—build confidence first
- Set a timer for 30-45 minutes per problem to simulate interview pressure
- Write your solution without looking at hints initially
- Review multiple solutions in the discussion section even after solving correctly
- Note patterns in your interview notebook—many problems share similar approaches
- Revisit problems you struggled with after a week to ensure understanding stuck
Pro tip: Do at least one problem every single day rather than cramming. Consistency beats intensity when building problem-solving muscle memory.
2. Glassdoor Interview – Real Questions from Real Candidates
What is Glassdoor Interview?
Glassdoor’s interview section is like having a spy network inside every company you’re applying to. It’s a crowdsourced database where actual candidates share the exact questions they were asked during real interviews. Founded in 2007, Glassdoor has grown into the world’s most comprehensive company review platform, and its interview section contains millions of authentic interview experiences.
Key Features
- Company-specific interview questions shared by real candidates who interviewed there
- Interview difficulty ratings so you know what you’re walking into
- Candidate experiences detailing the entire interview process from application to offer
- Interview tips specific to each company and role
- Salary information to help you negotiate confidently
- Questions organized by role (software engineer, product manager, data analyst, etc.)
- Interview process timelines showing how long companies take to respond
Use Cases
Absolutely perfect for when you’ve got an interview scheduled at a specific company and want to know exactly what to expect. A marketing manager interviewing at Salesforce can read through 50+ real interview experiences from people who interviewed for similar roles. Recent grads can use it to understand what entry-level interviews actually entail at their target companies—no more going in blind. Career switchers benefit from seeing what questions are asked across different industries, helping them prepare for role-specific scenarios they might not anticipate.
Who Should Use Glassdoor Interview?
Anyone interviewing at a mid-to-large company should use Glassdoor. It’s particularly valuable for corporate roles, consulting positions, and established tech companies where interview processes are more standardized. If you’re interviewing at a startup with fewer than 50 employees, you might find limited information, but for Fortune 500 companies, the interview intel is gold.
Why Choose Glassdoor Interview?
The specificity is unmatched. Instead of generic “tell me about yourself” advice, you’ll see: “The hiring manager asked me to walk through a specific campaign I ran and explain why certain metrics declined in Q3.” This level of detail helps you prepare stories and examples that directly address what interviewers actually care about. Plus, seeing salary ranges helps you negotiate from a position of knowledge rather than guessing.
Pricing
100% Free – No premium tier, no paywall. Just create an account and you have full access to all interview questions and company reviews.
Pros and Cons
Pros:
- Completely free with no limitations
- Real questions from actual interviews, not hypotheticals
- Company-specific insights you can’t get anywhere else
- Salary data helps with negotiation preparation
- Reviews help you evaluate if you even want the job
Cons:
- Quality varies—some reviews are detailed, others are vague
- No practice mechanism, just information
- Older entries may not reflect current interview processes
User Ratings
4.4/5 stars on Trustpilot (based on 15,000+ reviews) — View reviews on Trustpilot
User quote: “I read through 30 interview reviews before my Amazon interview and was asked four of the exact behavioral questions people mentioned. Felt like I had the answer key.”
How to Use Glassdoor Interview
- Search for your target company in the Glassdoor search bar
- Navigate to the “Interviews” tab on the company page
- Filter by your specific role to see relevant questions
- Read at least 10-15 interview experiences to identify patterns
- Take notes on commonly asked questions and themes
- Prepare STAR-format stories that address the most frequent question types
- Check the interview difficulty rating to calibrate your preparation intensity
- Review recent experiences first (within the last 6 months) for current accuracy
Pro tip: Pay special attention to the “negative experience” reviews—they often reveal red flags about company culture or unrealistic interview expectations.
3. Pramp – Live Practice with Real Humans
What is Pramp?
Pramp (Practice Makes Perfect) flips the script on interview preparation by connecting you with real people for live mock interviews. Instead of practicing alone or with expensive coaches, you interview with peers who are also preparing—and you take turns being both the interviewer and the interviewee. It’s brilliant in its simplicity and incredibly effective for building actual interview skills.
Key Features
- Peer-to-peer mock interviews scheduled at your convenience
- Turn-based format where you both interview and are interviewed
- Technical and behavioral questions provided by the platform
- Video conferencing built-in with code editor for technical interviews
- Instant scheduling available within minutes or book ahead
- Post-interview feedback forms to exchange constructive criticism
- Practice different interview types: coding, system design, behavioral, product management
Use Cases
Ideal for the engineer who’s technically solid but gets nervous talking through solutions out loud. You’ll practice explaining your thought process, which is often more important than the solution itself. Also great for introverts who need to build comfort with the interview conversation dynamic before facing high-stakes real interviews. Product managers and data scientists use it to practice case interviews and analytical frameworks. Anyone who hasn’t interviewed in years benefits from the low-stakes environment to shake off the rust.
Who Should Use Pramp?
Perfect for anyone who learns better through doing rather than reading. If you’re the type who can read about swimming techniques all day but needs to get in the pool to actually learn, Pramp is your pool. It’s especially valuable for candidates interviewing at multiple companies—you can practice different interview styles and get comfortable with video interviews. Self-taught developers without formal CS backgrounds benefit enormously from experiencing what real technical interviews feel like.
Why Choose Pramp?
Because reading about interviews and doing interviews are completely different skills. You can know every algorithm in your sleep, but if you freeze when someone’s watching you code, all that knowledge becomes useless. Pramp gives you the reps you need. The peer aspect is genius—you learn just as much from interviewing others as being interviewed. You start recognizing what makes a good answer, what communication styles work, and what trips people up. Plus, it’s free, which is kind of amazing for live practice with real humans.
Pricing
Completely Free – Unlimited peer interviews at no cost. Pramp makes money through premium features like scheduled interviews with experienced engineers ($40/session), but the peer-to-peer platform is 100% free forever.
Pros and Cons
Pros:
- Actually free with no hidden costs or limited sessions
- Real interview experience, not just theory
- Both interviewing and being interviewed teaches you
- Flexible scheduling, even last-minute sessions
- Built-in code editor and video make it seamless
- Reduces interview anxiety through repeated exposure
Cons:
- Quality depends on your peer’s engagement level
- You need to schedule interviews, can’t practice on-demand
- Some peers might not provide detailed feedback
- Occasional technical glitches with video conferencing
User Ratings
4.7/5 stars on Product Hunt (based on 600+ reviews) — View reviews on Product Hunt
Standout review: “Did 15 Pramp interviews before my real ones. By interview #15, I wasn’t nervous anymore—I was just having a conversation. Got offers from 3 out of 4 companies I interviewed with.”
How to Use Pramp
- Create a free account and complete your profile with your preparation focus
- Schedule an interview for either immediate practice or a future time slot
- Review the prep materials sent before your session (usually sent 30 minutes prior)
- Join the video call at your scheduled time
- Start as the interviewer first (or interviewee, you’ll switch halfway)
- Ask the provided questions and evaluate your peer’s responses
- Switch roles and experience being interviewed
- Exchange feedback using Pramp’s feedback form after the session
- Schedule your next session immediately—consistency is key
Pro tip: Do at least 5-7 Pramp sessions before your first real interview. The first couple will feel awkward, but by session 5, you’ll feel natural and confident.
4. InterviewBit – Structured Software Engineering Preparation
What is InterviewBit?
InterviewBit takes a bootcamp-style approach to interview preparation, offering structured learning paths that guide you through exactly what you need to know for software engineering interviews. Founded by former Microsoft and Amazon engineers, it combines coding practice with computer science fundamentals in a logical progression that builds your skills systematically.
Key Features
- Structured learning tracks covering algorithms, data structures, system design, and more
- 350+ coding challenges with detailed solutions and hints
- Topic-wise organization so you can master one concept before moving on
- Progress dashboard showing exactly what you’ve completed
- Mock interviews with time limits and scoring
- System design questions for senior-level preparation
- Interview experiences shared by candidates at top companies
- Skill certification badges to showcase on LinkedIn
Use Cases
Perfect for bootcamp graduates who need to fill CS fundamentals gaps before interviewing at product companies. You know how to build web apps but need to understand Big O notation and tree traversals—InterviewBit’s structured path takes you from zero to interview-ready. Also great for self-paced learners who do better with curricula rather than random practice. Career switchers appreciate the logical progression: you master arrays before moving to linked lists, then trees, then graphs. Students preparing several months in advance benefit from the learning tracks that prevent random, inefficient studying.
Who Should Use InterviewBit?
Ideal for junior to mid-level software engineers preparing for product company interviews. If you’re more comfortable building features than solving algorithm puzzles, InterviewBit’s structured approach prevents you from feeling lost. It’s particularly useful for developers from non-CS backgrounds who need comprehensive coverage without returning to university. Teams of bootcamp buddies often use it together to stay accountable.
Why Choose InterviewBit?
The structure eliminates decision paralysis. Instead of staring at 2,500 LeetCode problems wondering where to start, InterviewBit gives you a clear path: “Complete these 15 array problems, then move to strings.” The progressive difficulty feels like a video game—you level up as you go. Plus, the system design section is fantastic for senior-level prep, which many free resources ignore completely.
Pricing
Free Tier: Full access to all learning tracks, 350+ practice problems, and mock interviews—no credit card required
Pro Version: $99/year adds personalized mentorship, priority doubt resolution, and exclusive webinars with industry experts
The free version is genuinely comprehensive. Unless you want dedicated mentorship, you can complete full interview prep without paying.
Pros and Cons
Pros:
- Clear learning path removes guesswork
- Progressively challenging prevents overwhelm
- System design content for senior roles
- Strong computer science fundamentals coverage
- Progress tracking keeps you motivated
- Completely functional free tier
Cons:
- Fewer problems than LeetCode’s massive database
- Some explanations assume baseline knowledge
- UI feels less polished than newer platforms
How to Use InterviewBit
- Sign up for a free account (no payment info needed)
- Take the skill assessment to see where you currently stand
- Start with Programming Basics track even if you’re experienced (fills any gaps)
- Complete one topic daily rather than marathon sessions—consistency matters
- Don’t skip to hard problems early—master easy and medium first
- Review solutions even for problems you solved correctly
- Take mock interviews after completing each major topic section
- Join the community forum to discuss approaches with other learners
Pro tip: Use the “Topics” tab to identify your weak areas, then do every problem in that category before moving on. Depth beats breadth in interview prep.
5. Big Interview – Behavioral Questions with AI Feedback
What is Big Interview?
Big Interview brings the behavioral interview coaching experience online with video practice and AI-powered feedback. Created by interview coach Pamela Skillings, this platform focuses on the non-technical side of interviews—telling your story, answering “tell me about a time when” questions, and presenting yourself confidently. The AI analyzes your recorded practice answers for pacing, filler words, and confidence level.
Key Features
- Video recording practice so you can see yourself as interviewers see you
- AI-powered analysis of your speech patterns, pace, and word choice
- Behavioral question database with proven frameworks for answering
- Industry-specific questions for consulting, finance, healthcare, tech, and more
- Mock interview builder letting you create custom practice sessions
- Answer guides and examples showing what strong responses look like
- Virtual interview simulator replicating video interview platforms like HireVue
- Interview outfit checker providing feedback on professional appearance
Use Cases
Perfect for mid-career professionals who haven’t interviewed in five years and feel rusty on the current norms. You’ll quickly realize you say “um” more than you thought and can fix it before real interviews. Great for recent grads who struggle with the STAR method (Situation, Task, Action, Result) for behavioral questions—seeing model answers crystallizes how to structure your stories. Career switchers use it to reframe past experiences for new industries. Anyone doing video interviews benefits from practicing in a low-stakes environment where you can redo answers until they’re polished.
Who Should Use Big Interview?
Ideal for professionals in non-technical roles: marketing, sales, operations, HR, consulting, finance. If your interview won’t involve coding but will involve lots of “tell me about a time you handled conflict,” this is your platform. Also perfect for executives and senior leaders preparing for behavioral-heavy final rounds. If you’re great at your job but not great at talking about your job, Big Interview bridges that gap.
Why Choose Big Interview?
Watching yourself on video is uncomfortable but incredibly revealing. You’ll notice body language issues, verbal tics, and pacing problems you’d never catch otherwise. The AI feedback is surprisingly useful—it catches filler words you don’t realize you’re saying and measures whether you sound confident or hesitant. Plus, the platform actually teaches interviewing as a skill with frameworks and examples, not just question lists.
Pricing
Free Trial: 7-day trial with limited access to practice questions and video recording
Full Access: $79 for 60-day access or $159 for 6-month access
School Partnerships: Many universities provide free access to students—check your career services
The free trial gives you enough to practice a handful of questions, but the real value comes with paid access for comprehensive prep.
Pros and Cons
Pros:
- Video feedback reveals issues you’d never notice
- AI analysis provides objective improvement metrics
- STAR method framework simplifies answer structure
- Industry-specific questions feel relevant
- Mock interview simulator replicates real formats
- Unlimited practice recordings
Cons:
- Not free beyond the trial period
- Focuses only on behavioral, not technical
- AI feedback can feel robotic sometimes
- Video recording requirement may feel intimidating initially
User Ratings
4.3/5 stars on Capterra (based on 280+ reviews) — View reviews on Capterra
User testimonial: “I was terrible at behavioral interviews—always rambled or drew blanks. Big Interview’s STAR framework and video practice transformed my answers. Got comfortable seeing myself on camera, which was huge for my virtual interviews.”
How to Use Big Interview
- Start the free trial (no credit card required initially)
- Browse the question database for your industry and role
- Select 5-7 common questions to practice first
- Record your first answer without preparation to establish baseline
- Review the AI feedback noting pacing, filler words, and confidence scores
- Watch the model answer provided by expert coaches
- Re-record your response applying the feedback and framework
- Compare your first and final recordings to see improvement
- Practice consistently over several days rather than one marathon session
Pro tip: Practice your answers multiple times but don’t memorize them word-for-word. You want to sound natural, not like you’re reciting a script.
6. Exponent – Product Management and Tech Interview Excellence
What is Exponent?
Exponent is the premium interview prep platform designed specifically for product managers, product designers, and tech leaders. While it has a paid tier, the free content library is exceptional—featuring hours of expert interview videos, frameworks, and real interview questions from companies like Google, Meta, and Amazon. Think of it as a masterclass in PM and tech leadership interviews, taught by people who’ve actually worked at these companies.
Key Features
- Expert-led video lessons from PMs at FAANG companies
- Framework templates for product design, strategy, and estimation questions
- PM interview question database with model answers
- System design resources for technical PMs
- Mock interview recordings showing real interviews with feedback
- Community discussion forum with thousands of active PMs
- Resume and portfolio templates specifically for PM roles
- Salary negotiation guides with real compensation data
Use Cases
Essential for aspiring product managers preparing for their first PM role transition from engineering or design. You’ll learn the frameworks (CIRCLES, HEART, AARRR) that experienced PMs use instinctively. Senior PMs interviewing at FAANG companies use the system design and strategy content to prepare for bar-raising rounds. Product designers benefit from the product thinking frameworks that translate directly to design interviews. Anyone in a technical leadership role (engineering manager, technical program manager) finds value in the strategic thinking and communication frameworks.
Who Should Use Exponent?
Primarily for product managers at all levels, from APM candidates to senior PMs and directors. Also incredibly useful for engineers or designers transitioning into product roles—it demystifies what PMs actually do and how to talk about product thinking. Tech entrepreneurs preparing for partnership or funding conversations benefit from the strategic frameworks. If your interview involves product sense, strategy questions, or technical leadership, Exponent is essential.
Why Choose Exponent?
The expert videos alone are worth the price of admission (and they’re free). Watching a Facebook PM walk through exactly how they’d answer “How would you improve Instagram Stories?” provides pattern-matching abilities that generic interview prep can’t touch. The frameworks give you mental models to organize your thinking under pressure. Plus, the community is incredibly active—you can post your mock answers and get feedback from real PMs within hours.
Pricing
Free Tier: Access to 100+ free lessons, partial question database, community forum, and basic frameworks
Premium: $25/month or $199/year includes full question database, unlimited practice questions, mock interview matching, and advanced courses
The free content is genuinely substantial—you could prepare for PM interviews using only free resources, though premium adds convenience and depth.
Pros and Cons
Pros:
- Expert content from actual FAANG PMs, not generic coaches
- Frameworks that structure your thinking effectively
- Free tier offers genuine value, not just teasers
- PM-specific focus means highly relevant content
- Community provides peer support and feedback
- Regularly updated with new content and questions
Cons:
- Focused primarily on PM roles, less useful for pure engineering
- Premium tier required for full question access
- Some content assumes baseline product knowledge
User Ratings
4.8/5 stars on G2 (based on 340+ reviews) — View reviews on G2
Stellar review: “Prepared for my Google PM interview using Exponent’s frameworks. The CIRCLES method for product design questions and metric estimation frameworks gave me structure when I would have otherwise rambled. Walked out feeling confident—and got the offer.”
How to Use Exponent
- Create a free account and explore the lesson library
- Start with “Introduction to PM Interviews” video series
- Learn core frameworks (CIRCLES for design, AARM for metrics)
- Practice applying frameworks to sample questions
- Watch mock interview videos to see frameworks in action
- Post practice answers in the community for feedback
- Customize your prep based on your target company and role level
- Use the interview checklist to ensure you’re covering all question types
Pro tip: Don’t just memorize frameworks—practice applying them to random products you use daily. Ask yourself “How would I improve Spotify’s podcast feature?” and work through the CIRCLES framework. This builds intuition.
7. Interviewing.io – Anonymous Practice with Real Engineers
What is Interviewing.io?
Interviewing.io is where anonymous mock interviews meet job opportunities. You practice technical interviews with experienced engineers from top companies—completely anonymously with voice changers and avatars. If you perform well in these practice sessions, companies can request to interview you for real positions. It’s brilliant: interview practice that can literally turn into job offers.
Key Features
- Anonymous mock interviews with voice modulation protecting identity
- Practice with real engineers from Google, Facebook, Amazon, etc.
- Technical coding interviews with real-time collaboration
- Performance metrics tracking your improvement over sessions
- Job matching where companies reach out based on your performance
- Feedback after every session from your interviewer
- Different question difficulties so you can progressively level up
- Recording playback to review your performance afterward
Use Cases
Perfect for software engineers who freeze under pressure but know they’re talented. The anonymity removes anxiety about looking foolish, letting your actual skills shine. Candidates from underrepresented backgrounds in tech benefit from the bias reduction—you’re evaluated purely on technical ability, not appearance or accent. Engineers who’ve been rejected unfairly can rebuild confidence through successful anonymous interviews. Senior developers who haven’t interviewed in a decade use it to shake off rust in a judgment-free environment before real interviews.
Who Should Use Interviewing.io?
Primarily for software engineers preparing for technical coding interviews at product companies. If you’re interviewing at startups or FAANG companies, this replicates the actual interview experience nearly perfectly. It’s especially valuable for talented engineers who undersell themselves in interviews—the anonymity helps you focus on problem-solving rather than self-consciousness. International candidates benefit from the unbiased environment where accents and cultural differences don’t affect evaluation.
Why Choose Interviewing.io?
The anonymity is transformational for candidates dealing with interview anxiety. You can bomb an interview, learn from it, and try again without any real-world consequences. Plus, practicing with actual experienced engineers (not peers) means you get expert-level feedback on your communication, code quality, and problem-solving approach. The potential upside—getting recruited based on strong performance—makes this practice directly valuable beyond just skill building.
Pricing
Free Tier: Unlimited anonymous interview practice with experienced engineers (though booking sessions requires credits earned through participation)
Candidate Side: Completely free—you can practice and get matched with employers at no cost
Employer Side: Companies pay to access the platform, but candidates never do
Pros and Cons
Pros:
- Completely free for candidates forever
- Anonymity reduces bias and anxiety
- Real engineers provide expert feedback
- Can lead directly to job opportunities
- Realistic interview format and difficulty
- Recorded sessions for self-review
- No limit on practice sessions
Cons:
- Requires earning credits by interviewing others
- Scheduling can be harder than on-demand practice
- Limited to technical coding interviews
- Need decent coding skills to participate effectively
User Ratings
4.6/5 stars on Glassdoor (based on user reviews of the service) — View reviews on Glassdoor
Powerful testimonial: “I bombed my first three sessions on interviewing.io. But because they were anonymous, I wasn’t embarrassed—I just learned and improved. By session 10, I was crushing it. Got matched with a company and received an offer without a traditional interview. Game-changer.”
How to Use Interviewing.io
- Sign up and complete your technical profile
- Schedule your first practice interview (or conduct one as an interviewer to earn credits)
- Join the session using their platform with voice modulation activated
- Treat it like a real interview—communicate your thought process out loud
- Receive detailed feedback from your interviewer immediately after
- Review the recording to identify specific improvement areas
- Schedule your next session applying the feedback you received
- Complete 5-10 sessions to get comfortable and show consistent performance
- Keep your profile active so companies can reach out based on strong performances
Pro tip: Be the interviewer occasionally to earn credits and gain perspective on what makes a great interviewee. You’ll learn as much from evaluating others as being evaluated.
8. CareerCup – The Original Interview Question Database
What is CareerCup?
CareerCup is the OG of interview prep resources, founded by Gayle Laakmann McDowell, author of the legendary “Cracking the Coding Interview” book. Before LeetCode dominated the scene, CareerCup was where engineers went to find real interview questions. It’s a community-driven database with over 14,000 interview questions across software engineering, product management, consulting, finance, and more. While the interface feels a bit dated, the content depth is unmatched.
Key Features
- 14,000+ interview questions across multiple industries and roles
- Company-specific pages with questions asked at specific employers
- User-contributed solutions and discussion threads for each question
- Organized by company, topic, and difficulty for targeted practice
- Interview experience stories providing context for questions
- Active forum community discussing approaches and solutions
- Questions beyond tech including consulting cases, brainteasers, and behavioral
- Mobile-friendly interface for practice on the go
Use Cases
Fantastic for anyone interviewing at companies where you can’t find recent Glassdoor reviews—CareerCup often has older but still valuable question intel. Consulting candidates preparing for case interviews find business strategy questions that aren’t covered on coding-focused platforms. Engineers at traditional companies (banks, insurance, enterprise software) benefit from questions that aren’t purely algorithm-focused. If you’re applying to a specific company and want to see every question ever reported from there, CareerCup’s archives go back over a decade.
Who Should Use CareerCup?
Great for any job seeker, but particularly valuable for roles beyond pure software engineering. Finance professionals, consultants, product managers, and data analysts all find relevant questions. It’s also perfect for thorough preparers who want to see every possible question variation—if LeetCode is your primary practice, CareerCup is your supplementary research library. Computer science students appreciate the mix of theoretical and practical questions.
Why Choose CareerCup?
The breadth is incredible. Where other platforms focus narrowly on algorithms or behavioral questions, CareerCup covers everything from “reverse a linked list” to “estimate the number of gas stations in Manhattan” to “tell me about a time you disagreed with your manager.” The community discussions often provide multiple solution approaches and real-world context that pure answer keys can’t match. Plus, it’s from Gayle McDowell, whose “Cracking the Coding Interview” is basically the bible of tech interviews.
Pricing
100% Free – No premium tier, no paywalls. Everything is accessible once you create a free account.
Pros and Cons
Pros:
- Massive question database across all industries
- Completely free with no restrictions
- Questions date back years, showing evolution of interview practices
- Community discussions add valuable context
- Covers non-technical roles often ignored elsewhere
- Founded by a legitimate interview expert
Cons:
- Interface feels outdated compared to modern platforms
- No structured learning paths or guided practice
- Some questions and answers are outdated
- Search functionality could be better
- No video explanations or interactive practice
User Ratings
4.2/5 stars on Amazon (for the associated book, reflecting platform quality) — View on Amazon
User insight: “CareerCup’s question database helped me prepare for a consulting interview at Bain. Found case questions I wouldn’t have thought to practice otherwise. The variety is unmatched.”
How to Use CareerCup
- Create a free account on CareerCup.com
- Search for your target company to see company-specific questions
- Browse by topic if you’re focusing on specific skills (algorithms, product sense, etc.)
- Read the full question threads including community solutions and discussions
- Note question patterns that appear frequently across companies
- Cross-reference with other platforms—if you see a question on CareerCup, practice it on LeetCode
- Contribute back by sharing your interview experiences to help others
- Use the forum to ask clarifying questions about confusing problems
Pro tip: Don’t just read questions and solutions—actually attempt to solve questions yourself before reading discussions. The struggle is where the learning happens.
9. HackerRank – Technical Assessments and Company Prep
What is HackerRank?
HackerRank is dual-purpose: companies use it to assess candidates, and candidates use it to prepare for assessments. Many tech companies send HackerRank tests as part of their screening process, so practicing on the platform means you’re training with the exact format you’ll encounter. It offers coding challenges, competitions, and company-specific preparation tracks covering algorithms, data structures, SQL, and more.
Key Features
- Company-specific prep kits for Amazon, Google, Facebook, and others
- Skills certification tests you can add to LinkedIn
- Timed coding challenges that simulate real assessment conditions
- 30 Days of Code challenge for building consistent practice habits
- Multi-language support for Java, Python, C++, JavaScript, and more
- Discussion forums where you can see solution approaches
- SQL and database challenges beyond just algorithms
- Interview preparation kit with structured problem sets
Use Cases
Essential if your target company explicitly uses HackerRank for initial screening—you need to be familiar with the platform interface and time constraints. New grads preparing for campus recruitment benefit from the structured 30 Days of Code program that builds skills progressively. Self-taught developers use the certification tests to validate skills they learned independently. Data analysts and engineers preparing for SQL interviews find the database challenges directly relevant to job requirements.
Who Should Use HackerRank?
Perfect for early-career software engineers, data analysts, and anyone applying to companies that use technical assessments in their hiring process. If you’re interviewing at tech-forward startups or mid-sized product companies, there’s a good chance you’ll encounter HackerRank. It’s also great for developers who want recognized credentials—the certifications are actually respected by recruiters scanning LinkedIn.
Why Choose HackerRank?
If companies are going to test you on HackerRank, you should practice on HackerRank. The interface, time pressure, and question format need to feel second-nature before you’re under actual interview stress. The company-specific kits are gold—they’ve analyzed what each employer tends to ask and created targeted practice. Plus, earning certifications takes five minutes to add to LinkedIn and can help your profile surface in recruiter searches.
Pricing
Free Tier: Full access to practice problems, contests, and company-specific tracks—completely free forever
HackerRank for Work: Companies pay to use it for hiring, but candidates never pay
The free tier is comprehensive. There’s no premium candidate tier because HackerRank’s business model is charging employers, not job seekers.
Pros and Cons
Pros:
- Completely free for candidates
- Real assessment format used by actual companies
- Company-specific preparation tracks
- Certifications boost LinkedIn profile visibility
- SQL and database questions beyond just algorithms
- Active competitions build skills under pressure
- Structured learning tracks for beginners
Cons:
- Some questions feel more academic than practical
- Less community discussion than LeetCode
- Focus on test-taking over interview communication skills
- Time limits can feel artificial and stressful
User Ratings
4.5/5 stars on G2 (based on 1,100+ reviews) — View reviews on G2
User perspective: “My Amazon application required a HackerRank assessment. Good thing I’d practiced on the platform beforehand—knew exactly how the code editor worked and wasn’t flustered by the timer. Passed the screening round and made it to phone interviews.”
How to Use HackerRank
- Sign up for a free account
- Complete the Interview Preparation Kit to start with curated problems
- Choose company-specific tracks if you have target employers in mind
- Practice with time limits enabled to simulate real assessment pressure
- Take certification tests once you feel confident in a skill area
- Join the 30 Days of Code if you want structured daily practice
- Participate in competitions to test skills against others globally
- Review editorial solutions after attempting problems yourself
Pro tip: Take the certification tests even if you don’t feel 100% ready. They’re free to retake, and the first attempt shows you exactly what you need to study more.
10. Indeed Interview Questions – Industry-Wide Preparation
What is Indeed Interview Questions?
Indeed, the world’s largest job site, has a massive crowdsourced interview question database covering virtually every job title and industry imaginable. Unlike platforms focused on tech, Indeed covers healthcare, education, retail, hospitality, trades, and everything in between. If you’re interviewing for a nursing position, retail management role, or teaching job, Indeed’s interview section is your best resource.
Key Features
- Millions of interview questions across all industries and job types
- Job-title specific organization from entry-level to executive roles
- Salary information to inform your negotiation approach
- Interview process descriptions detailing what to expect at each stage
- Difficulty ratings from actual candidates
- Company culture insights from employee reviews
- Interview tips by role providing context beyond just questions
- Mobile app access for preparation on the go
Use Cases
Perfect for anyone interviewing in non-tech fields where specialized platforms don’t exist. A registered nurse preparing for a hospital interview finds questions about patient care scenarios and ethical dilemmas. Teachers see questions about classroom management and curriculum planning. Retail managers preparing for store leadership roles find situation-based questions about employee conflicts and customer complaints. Trades professionals (electricians, plumbers, mechanics) find technical and safety questions specific to their fields.
Who Should Use Indeed Interview Questions?
Literally anyone interviewing for any job, but especially valuable for roles outside of software engineering and product management. Healthcare professionals, educators, service industry workers, skilled trades, administrative roles—if it’s a job that exists, Indeed probably has interview questions for it. Also great for career changers exploring what different industries ask in interviews.
Why Choose Indeed Interview Questions?
The breadth is unmatched. Where other platforms excel in depth for specific roles, Indeed covers breadth across the entire employment spectrum. For many non-tech roles, it’s the only substantial free resource available. The integration with job listings is convenient—you can research interview questions while applying for positions all in one place.
Pricing
100% Free – No premium tier for interview questions. Indeed makes money from employer job postings, not job seekers.
Pros and Cons
Pros:
- Completely free with no limitations
- Covers industries ignored by tech-focused platforms
- Millions of questions from real candidates
- Integrated with job search functionality
- Salary data helps with negotiation
- Company reviews provide culture context
- Easy mobile access
Cons:
- Quality varies significantly by role and company
- No practice mechanisms or feedback
- Interface is basic compared to dedicated prep platforms
- Less detailed explanations than specialized sites
- Tech roles better covered on dedicated platforms
User Ratings
4.5/5 stars on Trustpilot (based on 50,000+ reviews of Indeed overall) — View reviews on Trustpilot
User feedback: “Preparing for a nurse manager interview, I found 50+ questions specific to healthcare leadership on Indeed. Saw several questions about budget management and staff scheduling that I wouldn’t have prepared for otherwise. Felt ready walking in.”
How to Use Indeed Interview Questions
- Search for your specific job title on Indeed
- Navigate to the company page you’re interviewing with
- Click the “Interviews” tab to see questions for that company and role
- Filter by job title to see most relevant questions
- Read through 15-20 interview experiences to identify patterns
- Note recurring themes and prepare stories addressing those areas
- Check salary information while you’re there for negotiation prep
- Read company reviews to understand culture and red flags
Pro tip: Search for your job title plus “interview questions” directly in Google—Indeed pages often rank highly and you’ll find company-specific questions quickly.
Visit Indeed Interview Questions
How to Choose the Right Tool for You
Picking the right interview prep resource depends on your role, timeline, and learning style. Here’s how to think about it strategically.
If you’re a software engineer preparing for technical interviews, start with LeetCode for algorithmic practice, supplement with InterviewBit for structured learning, and add Pramp for live practice. Once you’re comfortable solving problems alone, graduate to Interviewing.io for realistic mock interviews with experienced engineers.
For product managers and designers, Exponent should be your foundation. Learn the frameworks, watch expert videos, then apply what you learned in Pramp mock interviews. Supplement with Glassdoor to see actual company-specific questions.
Career changers and entry-level candidates benefit most from structured approaches. Begin with InterviewBit or HackerRank’s learning tracks to build fundamentals systematically. Add Big Interview to nail the “why this career change” narrative that you’ll face in every interview.
Non-tech professionals (marketing, sales, healthcare, education, consulting) should start with Indeed’s industry-specific questions and Glassdoor’s company reviews. Add Big Interview if you struggle with behavioral questions or video interviews.
If you have less than two weeks to prepare, focus on company-specific intelligence from Glassdoor and practice your storytelling with Big Interview. Add targeted technical practice on HackerRank if your role requires assessments.
With 1-3 months preparation time, build skills systematically with InterviewBit or LeetCode, do weekly Pramp sessions to maintain interview sharpness, and research company-specific questions in the final two weeks.
Budget-conscious? Stick with the completely free options: LeetCode’s free tier, Pramp, Glassdoor, CareerCup, HackerRank, and Indeed cover everything you need without spending a dollar.
Tips for Interview Prep Success
Start Earlier Than You Think You Should
Most people begin preparing two weeks before their first interview. Confident candidates start two months early. Interview skills are like muscles—you can’t cram your way to strength. Even 30 minutes of daily practice over six weeks beats marathon weekend sessions. Start practicing now, even if you don’t have interviews scheduled. When opportunities arise, you’ll be ready instead of scrambling.
Practice Out Loud, Not Just in Your Head
Reading interview questions and mentally composing answers feels productive but doesn’t build real skills. Speaking your answers out loud reveals verbal tics, awkward phrasing, and gaps in your logic that your brain glosses over internally. Record yourself answering common questions, then watch the playback. It’s uncomfortable but incredibly effective. Your third recorded attempt will be 10x better than your first.
Master the STAR Method for Behavioral Questions
Every behavioral question (“Tell me about a time when…”) should follow this framework: Situation (context), Task (your responsibility), Action (what you specifically did), Result (measurable outcome). Practice converting your work experiences into tight STAR stories. Write out 5-7 core stories that showcase different competencies—leadership, conflict resolution, innovation, failure and learning, etc. You can adapt these stories to answer dozens of different questions.
Prepare Questions for Your Interviewers
“Do you have any questions for me?” isn’t just politeness—it’s part of the evaluation. Asking thoughtful questions demonstrates genuine interest and strategic thinking. Prepare 5-7 questions exploring team dynamics (“What does success look like in the first 90 days?”), company strategy (“What’s the biggest challenge the team is facing right now?”), and growth opportunities (“How do you support employee development?”). Avoid questions about salary, vacation, or remote work until you have an offer.
Simulate Real Interview Conditions
Practicing in your pajamas on your couch doesn’t build interview-day confidence. Do mock interviews in interview clothes, at a desk, with your camera on. Set 45-minute timers. Practice with the same tools you’ll use (Zoom, Google Meet, HackerRank). Your brain needs to associate “interview mode” with specific environmental cues. When interview day arrives, the setting will feel familiar instead of foreign.
Research Each Company Deeply
Generic interview preparation only gets you partway. Spend 2-3 hours researching each company you’re interviewing with. Read their blog, understand their products, know their competitors, review recent news. Reference specific company initiatives in your answers: “I noticed your recent expansion into healthcare AI…” This level of preparation is rare and memorable—it signals genuine interest beyond just wanting any job.
Learn from Every Interview, Especially Rejections
After each interview, spend 15 minutes documenting: questions you were asked, questions you stumbled on, topics you wish you’d prepared better, and moments you felt confident. If you don’t get an offer, don’t just feel disappointed—analyze what happened. Were your technical skills weak? Did you communicate poorly? Did you fail to sell your interest in the role? Each interview makes you better at interviewing, but only if you extract the lessons.
Frequently Asked Questions
What is the best free tool for technical interview preparation?
LeetCode’s free tier is the gold standard for algorithmic coding practice, offering access to essential problems that mirror real technical interviews. For a more structured approach, InterviewBit provides complete learning tracks at no cost. If you want live practice with real humans, Pramp offers unlimited peer-to-peer mock interviews completely free. The best strategy combines all three: use InterviewBit or LeetCode for solo practice, then validate your skills through Pramp mock interviews.
Can I prepare for interviews without spending any money?
Absolutely. The resources in this guide—LeetCode (free tier), Pramp, Glassdoor, CareerCup, HackerRank, Indeed, and Interviewing.io—provide comprehensive preparation without spending a dollar. Millions of candidates have landed jobs at top companies using only free resources. Premium platforms add convenience and depth, but the fundamentals of interview success—practice, feedback, and refinement—are fully accessible for free.
How long should I spend preparing for interviews?
For technical roles, allocate 4-8 weeks of consistent preparation if you’re rusty on algorithms. Solve 2-3 coding problems daily, do weekly mock interviews, and review computer science fundamentals. For non-technical roles, 2-4 weeks of focused behavioral practice and company research is typically sufficient. The key is consistency over intensity—30 minutes daily beats occasional marathon sessions. If you have an interview in less than a week, focus on company-specific questions and polishing your core stories rather than trying to learn everything.
Do I need design experience to ace behavioral interviews?
Not at all. Behavioral interviews assess how you think, communicate, and handle challenges—skills you’ve built through any work experience. The STAR method helps anyone structure compelling answers regardless of background. What matters is articulating your experiences clearly, demonstrating self-awareness, and showing how you’ve grown from challenges. Tools like Big Interview teach these frameworks explicitly, making professional communication a learnable skill rather than an innate talent.
Should I memorize answers to common interview questions?
Never memorize answers word-for-word—you’ll sound robotic and can’t adapt to variations. Instead, prepare flexible frameworks and core stories you can customize. For behavioral questions, have 5-7 STAR stories ready that showcase different competencies. For technical questions, understand patterns and approaches rather than specific solutions. Practice enough that your answers feel natural and conversational, not rehearsed. The best interview answers feel spontaneous even though you’ve prepared the underlying structure.
Can these tools help with video interviews and HireVue assessments?
Yes, several resources specifically address video interview challenges. Big Interview’s virtual interview simulator replicates HireVue-style platforms where you record answers to prompted questions. Practicing on camera reveals body language issues, awkward eye contact (look at the camera, not your screen), and verbal tics you’d never notice otherwise. Pramp’s video sessions help you get comfortable talking on camera in real-time. The key is practicing in the actual format you’ll encounter—video interviewing is a distinct skill from in-person conversation.
How do I handle interview questions I don’t know the answer to?
Never bluff or make up answers—experienced interviewers spot this immediately. Instead, demonstrate your problem-solving process: “I haven’t encountered this specific scenario, but here’s how I’d approach it…” Walk through your thinking out loud, ask clarifying questions, and draw on adjacent experiences. For technical questions, explain what you do know about related concepts. Interviewers often care more about your thought process and composure under uncertainty than reaching the “correct” answer.
Are these resources useful for senior-level and executive interviews?
Most of these platforms work for all experience levels, though the focus shifts. Senior candidates face fewer technical trivia questions and more system design, strategic thinking, and leadership scenarios. Exponent’s advanced content covers this well. InterviewBit includes system design modules. Glassdoor’s interview experiences for senior roles reveal the different question types you’ll face. Executive interviews emphasize vision, cultural fit, and strategic thinking—use behavioral practice platforms to refine how you articulate your leadership philosophy and past impact.
Conclusion
Landing your dream job starts with preparation, and now you have the complete toolkit to prepare effectively without breaking the bank. From LeetCode’s comprehensive coding challenges to Glassdoor’s insider company intelligence, from Pramp’s live mock interviews to Indeed’s industry-spanning question database, these 10 free interview prep resources provide everything you need to walk into interviews with genuine confidence.
The best interview prep resource is the one you’ll actually use consistently. Start with whichever platform resonates with your learning style and interview needs, then layer in additional resources as you progress. A software engineer might begin with LeetCode and add Pramp after two weeks. A product manager could start with Exponent and supplement with Glassdoor research. A career changer might focus on Big Interview to nail the “why this transition” narrative.
Remember, interview success isn’t about being perfect—it’s about being prepared. These free resources eliminate the excuse that preparation is expensive or inaccessible. Dedicate 30-60 minutes daily to deliberate practice, and you’ll see dramatic improvement within weeks. Your next great career opportunity is worth the investment of time and effort.
If I had to pick one resource to start with today, I’d choose Pramp for immediate value. Nothing builds interview confidence faster than actual interview practice with real humans. Supplement it with LeetCode or Glassdoor depending on whether your interviews are technical or behavioral, and you’ve got a winning combination that costs absolutely nothing.
Now stop reading about interview preparation and start actually preparing. Your future self—the one celebrating a job offer—will thank you. Good luck out there!