The journey of every round

its broken

Implement a business rule validator that checks account balance before transfer

make it work

Write a validation pipeline behaviour in MediatR that collects all errors

fix it

Implement an event store that appends events and rebuilds aggregates

No entity, no technology, no domain. Just an action verb or complaint.

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