authenticator and concurrent systems: lessons learned (#173)

Architecture Decisions

Every system is the sum of its architectural decisions. Some decisions are reversible (which framework to use), others are irreversible (which database engine to choose). Focus your deliberation accordingly.

The Monolith-First Approach

Start with a well-structured monolith. Extract services only when you have:

  • Clear bounded contexts
  • Independent scaling requirements
  • Team boundaries that align with service boundaries

Event-Driven Communication

Instead of synchronous HTTP calls between services:

Service A → Message Bus → Service B
                        → Service C
                        → Service D

Benefits:

  • Decoupling: Services don't need to know about each other
  • Resilience: Failed consumers retry independently
  • Scalability: Add consumers without changing producers

Data Ownership

Each service owns its data. No shared databases. If Service B needs data from Service A, it either:

  1. Subscribes to Service A's events and maintains a local projection
  2. Makes an API call (with caching and circuit breakers)
  3. Uses a shared read model (CQRS pattern)

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