The journey of every round

Write a validation pipeline behaviour in MediatR that collects all errors

Implement an event store that appends events and rebuilds aggregates

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

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

Write a circuit breaker for cache reads that falls back to the database

Add cache stampede protection using lazy loading and locks

Write a worker that retries failed outbox messages with exponential backoff

Add scoped service access inside a BackgroundService using IServiceScopeFactory

Add graceful shutdown to a BackgroundService that drains in-flight work

Add auditing via SaveChanges override that captures before/after state

Implement optimistic concurrency using a rowversion/timestamp column

Implement tenant-scoped authorization that prevents cross-tenant access

Implement resource-based authorization using IAuthorizationHandler

Write a refresh token rotation endpoint that invalidates old tokens

Implement an async circuit breaker that tracks consecutive failures

Implement async producer-consumer pattern using Channel<T>

Implement a webhook delivery endpoint with HMAC signature verification

Implement idempotency key middleware that deduplicates POST requests

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

Write a circuit breaker for cache reads that falls back to the database

Add cache stampede protection using lazy loading and locks

Write a worker that retries failed outbox messages with exponential backoff

Add scoped service access inside a BackgroundService using IServiceScopeFactory

Add graceful shutdown to a BackgroundService that drains in-flight work