How to Solve System Design

System design case study for Astro Q-Commerce — 11 cases from flash sale to dynamic pricing with Go implementations.

Astro Q-Commerce — 11 Case Studies

Q-commerce has unique constraints: real-time inventory, geo-serviceability, driver dispatch, low latency. Case studies use Astro & Klik Indomaret as context.

Astro Q-Commerce — 11 Case Interviews — 11 complete system design cases: flash sale, inventory, geo, dispatch, ETA, checkout saga, promo engine, search, tracking, forecasting, dynamic pricing. All with Go examples.
Flash Sale System Design — Redis stock partitioning, waiting room, rate limiter, anti-bot
Real-time Inventory per Dark Store — Reservation pattern, oversell prevention
Geo Serviceability & Hub Assignment — H3/PostGIS, polygon coverage
Order Dispatch & Driver Allocation — Batching, greedy matching, GEOSEARCH
ETA Estimation — Picking time + OSRM routing + ML model
Checkout & Payment Saga — Orchestration saga, idempotency, outbox
Promo & Voucher Engine — Rule engine, atomic counter, anti-fraud
Search & Catalog — Elasticsearch + Redis stock filter per-hub
Real-time Order Tracking — WebSocket GPS, Kalman filter, pub/sub
Demand Forecasting — Holt-Winters, cold-start, FEFO
Dynamic Delivery Fee — Signal-based pricing, surge detection

References

System Design Interview — An Insider's Guide (Alex Xu) — The essential system design interview book. Vol 1 & 2 cover frameworks, real-world case studies, and architecture deep dives.
ByteByteGo — System design learning platform by Alex Xu. Newsletter, video courses, and architecture diagrams that are industry standard.