Pattern series
Exact tags are useful, but interview prep works better as grouped drills. Pick a series and compare how the same design move changes across products.
Practice series
Clicks, counters, dashboards, alerts, windows, and late-event correctness.
Practice series
RAG, agent loops, model routing, training clusters, tool gateways, and evaluation.
Practice series
Messaging, WebSockets, local-first state, CRDT/OT, fan-out, and backfill.
Practice series
Indexes, retrieval, autocomplete, recommendations, feeds, ranking, and RAG.
Practice series
Money movement, double-entry ledgers, retries, reconciliation, and billing-safe writes.
Practice series
Limited supply, holds, queues, booking flows, ticketing, auctions, and oversell control.
Practice series
Nearby search, geospatial indexes, ride dispatch, profile matching, and regional scale.
Practice series
Uploads, sync, object storage, CDN delivery, transcode pipelines, and file metadata.
Practice series
Retries, queues, webhooks, notifications, background jobs, circuit breakers, and leases.
Practice series
Rate limits, bot mitigation, fraud, moderation, policy enforcement, and scoped access.
Practice series
Hot keys, cache strategy, sharding, admission control, quotas, and durable fast paths.
Practice series
General prompts that are still useful when drilling requirements, scale, APIs, and trade-offs.
Exact pattern tags
Open a raw tag when you want the exact bank wording; use the series above for normal practice.
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