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Sandboxed coding rounds that run against a hidden test suite, and written questions graded against a rubric — side by side, because when you are drilling a topic you want both.
Topicimplementation (105)system-design (24)hld (20)trees (11)distributed-systems (10)arrays-hashing (9)concurrency (9)graphs (9)binary-search (8)consistency (8)dp-1d (8)linked-list (8)reliability (8)storage (8)
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- Design a notification serviceDelivery guarantees when every downstream provider is someone else and fails.mediumWrittenExplain to unlock#hld#queues#reliability45 min
- Design a rate limiterSmall surface, deep follow-ups. The distributed counter race is the real question.mediumWrittenExplain to unlock#concurrency#hld#reliability45 min
- Design a text-sharing serviceA warm-up that turns into a storage question the moment you ask where the body lives.mediumWrittenExplain to unlock#caching#hld#storage45 min
- Design a URL shortenerThe read-heavy canonical. Key generation, cache hit rate, and what a 301 costs you.mediumWrittenExplain to unlock#caching#hld#storage45 min
- Design search autocompleteLatency is the requirement, so almost everything must be precomputed.mediumWrittenExplain to unlock#caching#data-structures#hld45 min