Remember what you studied for your interviews
Bertopia uses spaced repetition to keep the patterns, complexity and system design you already studied fresh until interview day. Most cards are quick multiple choice questions you answer with one tap, so a review fits into 5 minutes on a commute. Packs are free and the app is coming to Android, iOS and macOS.
Why spaced repetition for interviews
You solved the sliding window problem three weeks ago. Will you spot the pattern under pressure? Much of what you learn grinding problems fades within days unless you see it again. Bertopia schedules each card with FSRS right before you would forget it, so easy cards come back rarely and the ones you miss come back soon.
It goes with NeetCode, not instead of it
Keep solving problems on NeetCode or LeetCode. That is where you learn to code a solution. Bertopia is the review layer on top: which pattern fits, what the complexity is, where the bug hides, which tradeoff a design needs. It is the part you can do one handed on a train.
The interview packs
Topics come from research on what about 25 companies actually ask, from big tech and AI labs to companies running at real scale, using public interview reports and official prep pages. Cards are tagged for mid and senior levels.
Data structures and algorithmsPick the pattern, the complexity, the bug and the edge case, with wrong options drawn from real candidate mistakes.
System designEstimation, component choice, tradeoffs and failure modes under stated constraints, plus open design prompts.
DatabasesContention, idempotency, indexes, isolation anomalies, replication lag and sharding.
NetworkingReal time transports, load balancers, retries and status codes, and latency budgets.
Operating systems and concurrencyRaces, deadlocks, bounded queues, thread safe caches and the OS limits behind backend incidents.
Programming languagesWhat does this print and where is the bug, in Python, Java, JavaScript, TypeScript, Go and Kotlin.
Want concept by concept answers? Browse the interview concepts. Already keep an Anki deck of your own? Bertopia opens it too.
