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Lessons (9)

• Scalable Frontend Architecture

  … A scalable application is not the one with the most folders; it is the one where a developer …

• What Is Software Architecture?

  … How fast? p95 page load under 300 ms Scalability Can it grow? Handle 10× traffic on Black Friday …

• Replication, Partitioning & Sharding

  … Do not shard because it sounds scalable; exhaust indexing, caching, replicas and partitioning where appropriate first.

• Design a Social Media Feed

  … Keep likes/comments as separate scalable counters or event streams. It is acceptable for a new post to …

• Resources, QoS and Scheduling Control

  … It is simpler and more scalable than anti-affinity for even spreading. Taints and tolerations A taint on …

• Premiere-Night Video Streaming

  … Goal --- --- --- Control Auth, entitlement, manifest, progress Small, stateless, scalable APIs Data Video segments CDN serves bytes from a …

• Design an E-Commerce Checkout

  Keep browsing scalable while protecting the correctness-critical path: inventory reservation, idempotent payment, order creation and durable events …

• Event-Driven Architecture

  … Shipping] S -- ParcelShipped N[Notifications] ✅ Highly decoupled and scalable. ❌ Hard to see or change the overall flow; error …

• Cross-Service Data: How to Join Without a Database JOIN

  … at DESC LIMIT 20; This is the most scalable option for high-read or high-cardinality views, but …