5. Distributed Systems
Event-Driven Architecture
Use domain events and transactional outboxes to connect components without tight synchronous coupling.
Lesson overview
Events describe facts that happened and allow independent consumers to react. Event schemas need stable IDs, versions and clear ownership. The transactional outbox pattern closes the database-to-message gap.
Learning path
Theory → Example → Code → Practice → Quiz → Challenge → Completion
Step 1
Theory
Events describe facts that happened and allow independent consumers to react. Event schemas need stable IDs, versions and clear ownership. The transactional outbox pattern closes the database-to-message gap.
Step 2
Example
OrderPaid can feed analytics, notifications and fulfillment independently. Each consumer can retry without forcing checkout to call every downstream system.
Step 3
Code
sql
insert into outbox_events(id, type, aggregate_id, payload)
values (gen_random_uuid(), 'OrderPaid', 'order_123', '{"version":1}');
Step 4
Practice
Review your current application and apply Event-Driven Architecture. 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 "Event-Driven Architecture"?
Step 6
Challenge
Design a production-ready implementation for Event-Driven Architecture. 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.