Idempotency
🔴 P0 — critical for payment systems, Stripe’s public API design is built on this
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🔴 P0 — critical for payment systems, Stripe’s public API design is built on this
🟠P1 — decouple deployment from release; essential for large systems
🔴 P0 — the holy grail of distributed message processing; critical for payments
🔴 P0 — the foundational impossibility result and its more nuanced successor
🟠P1 — solves the “one API doesn’t fit all clients” problem
🔴 P0 — the craft of designing APIs; shows engineering judgement, not just pattern knowledge
🔴 P0 — appears in nearly every system design interview
🔴 P0 — DDIA Ch4 core content; underpins the gRPC proxy pattern and API versioning
🟠P1 — how to push updates to many recipients; classic interview problem