InterviewPrepKit is a free, ad-free site for learning the concepts behind technical interviews: coding, SQL, machine learning, math, agents and LLMs, and system design.
Content is organized by pattern and tracked per topic. Everything runs in your browser, and by default your progress stays on your device — we never track what you practice. If you want your progress on more than one browser or device, you can optionally sign in with Google to sync it; we store only your progress, never your name or email. See the privacy policy for details.
How it's built
This project was built with heavy, deliberate use of Claude Code, and is coordinated and reviewed by a working big-tech software engineer who vets the questions and solutions for correctness and interview realism. AI does the drafting and scaffolding; a human owns the integrity of what you study.
How the content is sourced
Problem statements here are original summaries written for teaching; each links out to the source (for example, the original LeetCode problem) so you always have the canonical version. Solutions and explanations are written from scratch. This project isn't affiliated with LeetCode, NeetCode, or any employer.
Contribute or get in touch
Found a bug, want to suggest a question, or fix an explanation? Email the project:
Contributions, corrections, and topic requests are all welcome.