5. Distributed Systems
Queues & Background Jobs
Move slow, retryable or non-user-blocking work out of synchronous request paths.
Lesson overview
Queues decouple user-facing requests from slow or retryable work. Workers need idempotency, bounded retries, backoff, visibility timeouts and dead-letter handling.
Learning path
Theory → Example → Code → Practice → Quiz → Challenge → Completion
Step 1
Theory
Queues decouple user-facing requests from slow or retryable work. Workers need idempotency, bounded retries, backoff, visibility timeouts and dead-letter handling.
Step 2
Example
Signup can commit immediately while email verification runs as a job. A provider outage should delay email, not block account creation.
Step 3
Code
typescript
await queue.add("send-email", { userId }, {
attempts: 5,
backoff: { type: "exponential", delay: 1000 },
});
Step 4
Practice
Review your current application and apply Queues & Background Jobs. Document the current behavior, one production risk, the change you would make, and how you would verify it.
Step 5
Quiz
1. What is the central production concern in "Queues & Background Jobs"?
Step 6
Challenge
Design a production-ready implementation for Queues & Background Jobs. Include failure handling, security considerations, observability, testing and a rollback or recovery path where applicable.
Complete every stage
Work through every step in order, then the lesson will be marked complete.
Each chapter and subtopic has its own public URL under /full-stack-to-production.