Date: 2026-06-05
Time: 13:14
This is a fresh knowledge base — no entries or beliefs yet. I'll produce the reconnaissance from the repository structure. Each directory is a standalone system design interview problem with a consistent pattern: plan.md → plan_review.md → implementation → tests.
consistent-hashing/consistent_hashing.py — Hash ring implementation; foundational partitioning primitive used conceptually across many other designskey-value-store/keyvaluestore.py — Storage engine internals (replication, consistency model, partitioning); reveals codebase's approach to data modelingdistributed-message-queue/solution.py — Message ordering, consumer groups, delivery guarantees; backbone pattern for async systemspayment-system/payment_system.py — Idempotency and transaction patterns; highest correctness bar in the collectionrate-limiter/rate_limiter.py — Algorithm implementations (token bucket, sliding window); cross-cutting API protection concernstock-exchange/solution.py — Order matching engine; reveals low-latency data structure choices (order book, price-time priority)chat-system/chat_system.py — Real-time messaging architecture; different flavor from request/response systemsad-click-event-aggregation/click_aggregator.py — Stream processing and windowed aggregation; event-driven architecture patternsnews-feed-system/news_feed.py — Fan-out-on-write vs read trade-off; classic SDI design decisionhotel-reservation-system/hotel_reservation.py — Inventory concurrency control; pessimistic vs optimistic locking patternsdesign-google-drive/designgoogledrive.py — File sync and conflict resolution; potentially CRDT or OT patternsweb-crawler/web_crawler.py — Distributed crawl frontier; URL scheduling, politeness, deduplicationcross-cutting-patterns — Identify shared design patterns across implementations (idempotency, retry, circuit breaker, sharding strategies)consistency-models — Compare how different implementations handle consistency (eventual vs strong, CAP trade-offs made)plan-to-implementation-fidelity — Do implementations match their plans? Where do they diverge and why?