Week 10 · Sep 28-Oct 4, 2026
Uber + Tinder + Local Delivery Service
Location updates, geospatial partitioning, matching, dispatch, inventory and state machines. Exit gate: defend correctness during stale location and dispatch races.
Scope lock
| Project | Contract | Practice | Artifacts |
|---|---|---|---|
| Uber | CORE | 45m adaptive mock with two dives | Chinese deep lecture/audio, English Senior+/Staff recall script/PDF, Bad/Good/Great, invariants/failure/recovery/metrics |
| Tinder | FULL | 25-35m attempt + follow-up | Complete source links, Chinese explainer/audio, English recall outline |
| Local Delivery Service | FULL | 25-35m attempt + follow-up | Complete source links, Chinese explainer/audio, English recall outline |
Week plan
| Day | Date | Focus | Evidence |
|---|---|---|---|
| Day 1 | 2026-09-28 MON | Uber HLD: fare, ride request, location update, candidate match | Uber HLD with Rider/Driver/Fare/Ride/Location/DriverOffer schema and API trust boundaries. |
| Day 2 | 2026-09-29 TUE | Uber deep dives: geo index, freshness, driver reservation, durable dispatch | Uber deep-dive matrix with geospatial indexing, hot zones, freshness/confidence, driver reservation TTL, idempotent assignment, cancellation races, SLIs. |
| Day 3 | 2026-09-30 WED | Tinder full: profile preferences, geo feed, swipe, mutual match | Tinder 30m attempt: profile/feed/swipe/match schema, APIs, feed cache, swipe partition key. |
| Day 4 | 2026-10-01 THU | Tinder deep dives: atomic mutual match, feed generation, stale cache, Bloom filter | Tinder follow-up sheet: consistency/latency/feed/no-reshow, with failure and metrics. |
| Day 5 | 2026-10-02 FRI | Local Delivery full: availability, nearby DCs, inventory reservation | Local Delivery 35m attempt/follow-up: DC service area, availability cache, inventory/order transaction, substitution/cancel state. |
| Day 6 | 2026-10-03 SAT | Adaptive mock: Uber 45m plus Tinder and Local Delivery pressure rounds | Mock score sheet with Uber two dives, Tinder follow-up, Local Delivery follow-up, lowest-dimension repair target. |
| Day 7 | 2026-10-04 SUN | Synthesis and repair: stale facts, reservations, races, observability | Scorecard completed, production evidence recorded, READY_FOR_REVIEW in Week 10 production record. |
Mechanism map
Location FreshnessobservedAt, confidence, adaptive intervals, stale exclusion
Geo Partitioninggeocell shards, hot-zone split, routing epoch
ReservationDriverOffer and InventoryReservation as durable state machines
Safe Recoveryidempotency, fencing, timeout/cancel races, SLIs
Artifacts
| Project | Chinese | English | Practice |
|---|---|---|---|
| Uber CORE | deep script · audio | recall · PDF | 45m adaptive mock |
| Tinder FULL | explainer · audio | outline | 25-35m attempt + follow-up |
| Local Delivery FULL | explainer · audio | outline | 25-35m attempt + follow-up |
Detailed lecture notes, audio, recall scripts, PDFs, Staff Q&A, and mock packs are archived locally and are intentionally not published on this site.