About Katkat
Interview questions you can trust.
Katkat is an interview-prep library built around one idea: practice the questions companies actually ask. Coding, system design and machine learning questions, with hints, a browser code runner, an AI mentor and full solutions — organized by company and topic.
- interview questions
- 9,403
- companies
- 546
- topics
- 11
- interview experiences
- 3,935
Editorial standards
Real interview questions
Questions are based on what candidates report being asked, tagged by company, role, round and topic, so you can practice for a specific loop.
Tested where it counts
Solution walkthroughs are written with the help of AI. Where a question has a built-in code judge, the reference solution must pass every test — edge cases and large inputs included — before the judge goes live.
Continuously maintained
Interview loops change. We keep adding newly reported questions and fix anything readers flag.
Reader-first, ad-free
No pop-ups, no auto-play, no interstitials. We're funded by memberships, not by interrupting your practice.
The Katkat editorial team
Questions and solutions are collected and maintained by the Katkat team. Spotted a wrong answer or an outdated question? Tell us and we fix it fast.