Domain Specific

🟠 P1 — directly relevant to Stripe (multi-tenant SaaS platform)

🟠 P1 — the accounting pattern underlying every financial system

🔴 P0 — Stripe’s public API is built on this; the implementation of idempotency for APIs

🔴 P0 — the holy grail of distributed message processing; critical for payments

🟠 P1 — how to push updates to many recipients; classic interview problem