CodeSimulators
CodeSimulators
Part 1 — Scaling 0 → 1M
Act 1 — The Monolith
The Monolith
Separate the Database
Act 2 — DB Bottleneck
Caching with Redis
Read Replicas
Indexes & Query Perf.
Act 3 — App Layer
Load Balancer
Stateless Services
Act 4 — Write Scale
Message Queues
Database Sharding
CDN
Act 5 — The Glue
API Gateway
Real-Time Communication
Act 6 — Reliability & Ops
Observability, Failure & Recovery
Part 2 — Interview Playbook
The Method
The Interview Framework
The Problem Archetypes
The Problems
Design Twitter / Feed
Ad Click Aggregator
Ticket Booking (Ticketmaster)
WhatsApp / Chat
YouTube / Netflix
Uber / Nearby
Search Autocomplete
URL Shortener
Key-Value Store
Google Docs
Dropbox / Drive
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