Hey PH! I'm Adrian, solo developer behind PrepCity. I built this because interview prep felt broken. You either watch hours of lectures, memorize solutions you forget in a week, or pay $100+ per mock interview. PrepCity takes a different approach: - The mock interviewer is adversarial by design. It catches your math errors ("100M/86400 is not 1000 QPS"), challenges hand-waving ("that's a textbook answer - what does it look like in production?"), and never says "great question." - DSA coaching derives code from observation, not presentation. You trace by hand, spot the pattern, then the loops emerge naturally - like proof by induction. - System design uses actual graph analysis on your architecture diagrams - BFS reachability, shortest paths, cycle detection - to find flaws a human interviewer might miss. - At the end, you get a scorecard: Google L3-L7 level assessment, hire/no-hire decision, dimension-by-dimension rubric, and specific recommendations. 236 system design topics. 74 coding problems across 19 patterns. Voice mode for practicing out loud. Would love feedback on the mock interview grading - that's where most of the engineering went. Links - add these: - https://prepcity.io (main) - https://prepcity.io/download (apps) - https://prepcity.io/problems (coding problems) - https://prepcity.io/library (system design library) X account: @prepcity_io

PrepCity

AI coach that drills you harder than a real FAANG interview

AI coach that drills you harder than a real FAANG interview