How do I decide what becomes a microservice?
Use domain-driven design, look for bounded contexts, find features with independent change rates or scaling needs, and align with team structure. Let the real product teach you the boundaries.
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More FAQs in Service Boundaries: How to Decide What Becomes a Microservice
A part of the domain that can be reasoned about independently. Auth is a bounded context. Chat is another. They have their own data, rules, and changes, which makes them good service candidates.
No. That is a layered architecture, not a service boundary. It couples services tightly because every request crosses all layers. Split by business domain instead.
Yes. A service that does one tiny thing adds operational overhead without payoff. Each service should be substantial enough to justify running it.
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