P0

🔴 P0 — the default error recovery mechanism; Stripe definitely asks about this

🔴 P0 — prevents cascading failures by stopping calls to a failing service

🔴 P0 — staff-level framing question: how do multi-service workflows coordinate?

🔴 P0 — the most fundamental reliability mechanism; every network call needs one

🔴 P0 — definitely Stripe territory; protecting services from overload

🔴 P0 — queues are the backbone of async architectures

🔴 P0 — the most fundamental inter-service communication decision

🔴 P0 — the distributed transaction pattern for microservices; critical for Stripe payment flows

🔴 P0 — “There are only two hard things in CS: cache invalidation and naming things”

🔴 P0 — the classical distributed transaction protocol and why it’s limited