FAANG Mock Interview Prep & Timer Mode
10 high-yield system design interview scenarios with expected answers, red flags, bonus points, and a 60-minute mock timer.
60-Minute Interview Stage Progression & Time Budgets
Scope functional vs non-functional, DAU, read/write ratio, latency SLA.
State 10M MAU → 2M DAU → 400k PCU → 6.6k Peak RPS anchor chain.
Draw Client → CDN → NLB/ALB → Gateway → Microservices → Kafka → DB/Cache.
Idempotency keys, saga outbox, partition keys, DB connection limits, cache invalidation.
DDoS defense, load shedding priority ladder, DLQ retry, cost estimation.
10 Master FAANG Scenario Flashcards
1. Design an e-commerce checkout flow at 10M DAU
Walk client → CDN → gateway → order svc → payment svc (idempotent) → Kafka outbox → inventory → confirmation. Anchor everything on Peak_RPS (6.6k+).
02_User_Metrics, 06_Backend_Services, 07_Network_Latency
Jumping straight into microservice diagrams without stating scale numbers and latency budget first.
Mention Saga pattern with transactional outbox for dual-write avoidance and exactly-once publish.