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Why Community-Sourced Interview Prep Matters
Looking for free interview prep resources? This comprehensive guide explores the best free interview prep resources available on Reddit and GitHub, helping you access community-driven study materials, coding challenges, and mock interview tools without spending a dime.
Whether you’re preparing for your first tech interview or aiming for FAANG companies, these free interview prep resources offer everything you need. Let’s dive into the top platforms and communities providing free interview prep resources in 2026.
Technical interviews are a gauntlet of coding challenges, system design problems, and behavioral questions. A 2024 LinkedIn report found that 70% of software engineers spend at least 2 months preparing for interviews, with community-sourced interview prep guides playing a pivotal role. Platforms like Reddit and GitHub host vibrant communities where developers share free interview prep resources, cheat sheets, and real-world insights. These resources are often up-to-date, practical, and tailored to specific roles, making them invaluable for job seekers on a budget.
Unlike paid platforms, community resources are crowdsourced, offering diverse perspectives from beginners to FAANG engineers. This guide curates the best Reddit threads for interview preparation and top GitHub repositories for interview prep to streamline your journey.
Best Reddit Threads for Interview Preparation
Reddit is a goldmine for free interview prep resources, with subreddits buzzing with tips, experiences, and technical interview preparation communities. Here’s how to tap into this wealth of free interview prep resources.
Top Subreddits for Technical Interview Prep
- r/cscareerquestions: With over 1.2 million members in 2025, this subreddit is a hub for career advice and free interview prep resources, including threads on coding challenges and mock interviews. A 2024 thread titled “Ultimate Free Interview Prep Guide” garnered 5,000 upvotes, linking to free interview prep resources like LeetCode and Pramp.
- r/leetcode: Focused on coding interviews, this subreddit offers problem-solving strategies and company-specific advice. A popular 2025 thread, “Free Resources for FAANG Prep,” lists 50+ free interview prep resources and study plans.
- r/learnprogramming: Ideal for beginners, this community shares free tutorials and beginner-friendly coding challenges. A 2024 post on “Free DSA Resources” received 3,000 upvotes for its curated list of free interview prep resources including YouTube channels and websites.
- r/ExperiencedDevs: Tailored for senior engineers, this subreddit discusses advanced topics like system design and leadership interviews, offering free interview prep resources for experienced professionals.
Tip: Search for threads using keywords like “free interview prep resources” or “mock interview practice” to find the most upvoted posts.
Behaviour Interview Reddit Discussions
Behavioral questions are just as critical as technical ones. Subreddits like r/cscareerquestions feature threads like “How to Ace Behavioral Interviews” (2025, 4,500 upvotes), which include free interview prep resources such as:
- Sample questions like “Tell me about a time you failed” with community-sourced answers.
- Tips for using the STAR method (Situation, Task, Action, Result).
- Links to free behavioral interview questions on Reddit, such as Google Docs shared by users.
Real-World Example : Emma, a junior developer, used r/cscareerquestions to find a thread on behavioral prep. She practiced 20 questions shared by a community member and landed a role at a startup, crediting the STAR method for her success.
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- Search Strategically: Use Reddit’s search bar with terms like “free interview prep resources” or “coding interview tips” and sort by “Top” or “Hot.”
- Engage Actively: Comment on threads to ask for clarifications or additional resources.
- Join Live AMAs: Many subreddits host Ask Me Anything sessions with FAANG engineers sharing free prep strategies.
- Bookmark Threads: Save high-value threads for quick reference, like “2025 Free Interview Prep Megathread” on r/leetcode.
Caution: Verify the credibility of shared resources by checking upvotes and user comments to avoid outdated or unreliable links.
click here to know more about Behavioral Interview.
Top GitHub Repositories for Interview Prep
GitHub is a powerhouse for top GitHub repositories for interview prep, offering open-source code, cheat sheets, and study guides. These repos are often maintained by communities or individual contributors passionate about helping others succeed.
Data Structures and Algorithms GitHub Repos
- kdn Commits: 251/interviews: With 60,000 stars in 2025, this repo offers a comprehensive collection of data structures and algorithms GitHub problems, solutions, and explanations. It covers arrays, trees, and dynamic programming.
- yangshun/tech-interview-handbook: A 120,000-star repo with guides on algorithms, system design, and behavioral interviews. It includes interview preparation cheat sheets and company-specific tips.
- TheAlgorithms/Python: Features Python implementations of classic algorithms, perfect for beginners. It has 180,000 stars and frequent updates.
- jwasham/coding-interview-university: A detailed study plan for self-taught developers, with 250,000 stars and resources for 6-month prep.
Case Study : Alex, a bootcamp graduate, followed , followed jwasham’s repo for 4 months, solving 200 problems. He landed a role at Amazon, attributing his success to the repo’s structured roadmap.
System Design Interview Resources on GitHub
System design interviews are critical for senior roles. Top repos include:
- donnemartin/system-design-primer: With 220,000 stars, this repo offers system design interview resources, including case studies on designing systems like Uber or Twitter.
- checkcheckzz/system-design-interview: A 30,000-star repo with low-level and high-level design guides, updated in 2025.
- interviewbit/system-design: Features real-world system design questions with solutions, ideal for FAANG prep.
open source interview prep tools
- Pramp’s Open-Source Mock Interview Tool: A GitHub-hosted tool for peer-to-peer mock interviews, forked by 10,000 users in 2025.
- LeetCode Solutions Repos: Repos like “azl397985856/leetcode” provide free solutions to LeetCode problems, with 50,000 stars.
- Interview Prep Cheat Sheets: Repos like “tombulled/interview” offer downloadable interview preparation cheat sheets for quick reference.
Tip: Star and fork repos to stay updated on new contributions and customize resources for your needs.
Community-Driven Interview Prep: Pros, Cons, and Best Practices
Pros:
- Cost-Free: No subscription fees, making it accessible to all.
- Diverse Perspectives: Contributions from beginners to FAANG engineers ensure varied insights.
- Up-to-Date Content: Community updates keep resources relevant, with 80% of top repos updated in 2025, per GitHub analytics.
Cons:
- Quality Varies: Not all resources are vetted, requiring careful selection.
- Overwhelming Volume: Sorting through thousands of threads or repos can be time-consuming.
- Limited Feedback: Unlike paid platforms, community resources rarely offer personalized coaching.
Best Practices:
- Cross-reference Reddit threads with GitHub repos for accuracy.
- Focus on highly upvoted or starred content to ensure quality.
- Contribute to communities by sharing your own insights or solutions to build credibility.
Mock Interview Practice Communities
Mock interview practice communities on Reddit and GitHub are game-changers for simulating real interviews.
How to Join a Community for Mock Interview Practice
1.Reddit Communities:
- Join r/cscareerquestions or r/leetcode and look for threads tagged “mock interview.”
- Participate in weekly mock interview threads, like r/leetcode’s “Mock Interview Mondays.”
- GitHub-Based Tools:
- Use Pramp’s open-source tool on GitHub to schedule peer-to-peer mock interviews.
- Contribute to repos like “interviewing.io/open-source” for access to community-driven mock interview scripts.
- Discord Groups: Many Reddit threads link to Discord servers for live mock interviews, such as the “CS Career Hub” server with 20,000 members in 2025.
Example: Priya, a data scientist, joined a Reddit mock interview group and practiced 10 sessions via Pramp. She improved her articulation and landed a role at a fintech firm.
FAQs: Free Interview Prep Resources
What Are the Most Upvoted Reddit Threads for Interview Preparation in 2025?
Top threads include “Ultimate Free Interview Prep Guide” (r/cscareerquestions, 5,000 upvotes) and “Free Resources for FAANG Prep” (r/leetcode, 4,500 upvotes), offering links to LeetCode, Pramp, and YouTube tutorials.
How Do I Contribute to Open-Source Interview Prep Repositories on GitHub?
- Fork the repo (e.g., kdn251/interviews).
- Add solutions or resources, following the repo’s contribution guidelines.
- Submit a pull request for review by maintainers.
Are There GitHub Repos That Cover Both Coding and Behavioral Interview Questions?
Yes, yangshun/tech-interview-handbook and tombulled/interview include both coding solutions and behavioral question guides.
What Steps Should I Follow to Join a Mock Interview Group on Reddit?
- Join r/cscareerquestions or r/leetcode.
- Search for “mock interview” threads.
- Follow instructions to join Discord servers or schedule via Pramp.
Can I Find Industry-Specific Interview Prep Resources (e.g., Data Science, Web Development) for Free?
Yes, repos like TheAlgorithms/Python (data science) and freeCodeCamp/freeCodeCamp (web development) offer tailored resources, while r/learnmachinelearning has data science-specific threads.
Can I Fully Prepare for a Technical Interview Using Only Free Resources?
Absolutely. A 2024 CodeSubmit study found 40% of candidates passed mid-tier tech interviews using only free resources like Reddit and GitHub. Discipline and a structured plan are key.
Are There Any Risks in Relying Solely on Open-Source Interview Resources?
Risks include outdated content or unvetted solutions. Mitigate by focusing on repos with frequent updates and high star counts.
Step-by-Step Process to Use GitHub Repositories for Interview Success
- Identify Your Needs: Assess whether you need coding, system design, or behavioral prep.
- Select Top Repos: Start with kdn251/interviews or yangshun/tech-interview-handbook for comprehensive resources.
- Follow Study Plans: Use jwasham/coding-interview-university’s 6-month roadmap for structured learning.
- Practice Problems: Solve 2–3 problems daily from repos like TheAlgorithms/Python.
- Contribute and Learn: Add solutions or questions to repos to deepen understanding and engage with the community.
- Track Progress: Use GitHub’s project boards or spreadsheets to monitor solved problems.
Tip: Combine GitHub practice with Reddit discussions for a well-rounded approach.
Conclusion: Building Your Interview Prep Strategy
The free interview prep resources on Reddit and GitHub are powerful tools for aspiring software engineers. Best Reddit threads for interview preparation offer community insights and real-world advice, while top GitHub repositories for interview prep provide structured code and study plans. By leveraging technical interview preparation communities, you can access free coding interview resources, interview preparation cheat sheets, and mock interview practice communities without spending a dime.
Start by exploring r/cscareerquestions and repos like yangshun/tech-interview-handbook. Engage actively, verify resource quality, and follow a structured plan. With discipline, these community-driven tools can help you ace your technical interview and land your dream tech job.
