Tech
Designing a Backend System That Handles 100K Requests/Second (Without Melting Your Database)
TL;DR Architecture
At high level:
Global Traffic Routing (Geo DNS / Anycast)
Edge Layer (CDN + WAF + Rate Limiting)
Load Balancers (L4 + L7)
Stateless App Tier (autoscaled microservices)
Multi layer Caching (edge, distributed, local)
Data Layer (sharded DB + replicas + queue based writes)
Async Processing (Kafka / stream workers)
Observability + Auto healing
1) Capacity Planning First (Quick Math)
Never start with boxes and arrow...
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