The journey of every round

Write a worker that retries failed outbox messages with exponential backoff

Add scoped service access inside a BackgroundService using IServiceScopeFactory

Implement optimistic concurrency using a rowversion/timestamp column

Implement tenant-scoped authorization that prevents cross-tenant access

Implement async producer-consumer pattern using Channel<T>

Add global exception handling middleware that maps domain exceptions to HTTP status codes

Write a distributed transaction coordinator using the Saga pattern

Add OpenTelemetry tracing instrumentation across HTTP, database, and queue boundaries

Implement a sliding window aggregation over a time-ordered sequence

Write a validation pipeline behaviour in MediatR that collects all errors

Write a Saga orchestrator for a multi-step order fulfilment workflow

Implement an outbox pattern that ensures at-least-once delivery

Write a worker that retries failed outbox messages with exponential backoff

Add auditing via SaveChanges override that captures before/after state

Implement optimistic concurrency using a rowversion/timestamp column

Write a refresh token rotation endpoint that invalidates old tokens

Implement an async circuit breaker that tracks consecutive failures

Implement a webhook delivery endpoint with HMAC signature verification