Microservices
A microservices architecture splits an application into small autonomous services, each responsible for a business domain (auth, catalog, billing), often communicating via APIs or events. Each service can be deployed, scaled, and evolved relatively independently.
It becomes interesting when a team is large enough and some parts of the system have very different scalability or release-cadence needs. For a SaaS monolith still owned by a small team, a well-modularized monolith is often more productive. The choice depends as much on organization size as on tech.
Trap #1 is adopting microservices as a fashion statement, too early. You then inherit network latency, DevOps complexity (observability, tracing, deployments), and hard distributed transactions, without shipping faster. Better to split when monolith pain is real and measured, not theoretically anticipated.
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