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Lessons (6)

• Product-Scale Frontend Patterns

  Design optimistic workflows, feature flags, offline behavior, multi-tenant presentation and role-aware UI without treating the browser …

• Caching, Consistent Hashing and Sharding

  … Tenant ID works for a multi-tenant product; user ID works for personal data. A celebrity or huge …

• Debug Latency Like an Investigator

  … More instances can multiply pools and worsen database contention. Walk through a failure and recovery A missing index …

• Backend Design Scenarios

  … The misses may also be concentrated on the hottest keys, may trigger expensive joins, or may be multiplied …

• Caching & Redis

  … In a multi-service system, publish a durable product.updated event so other caches can invalidate too. 3 …

• 500 Users Upload Documents at Once: Design the Background Job Pipeline

  … be very heavy) Prefetch of 1 ( worker prefetch multiplier=1 ) One slow job no longer hides behind a …