The MSA PoC was failing by the third sprint, and no one could explain why. The code looked clean. The tests passed. But the system still buckled under real load.
A microservices architecture proof of concept is supposed to reveal these truths early. An MSA PoC is not a demo for slides; it is a stress test for reality. It shows if the boundaries between services make sense, if the communication patterns work under pressure, and if deployments remain predictable.
Starting an MSA PoC means deciding your scope with precision. Define the minimum set of services that demonstrate the architectural vision. Include a service for core business logic, one for data persistence, and one for integration. Leave out anything that does not test scale, resilience, or complexity. Overbuilding in a PoC hides the risks you came to discover.
Service contracts are the spine of an MSA. In a PoC, keep them strict and explicit. Use clear API definitions. Add schema validation at every boundary. This prevents silent failures that can distort your metrics and mask communication flaws.
Monitoring is not optional. An MSA PoC without observability is blind. Tag every request. Track latency, error rates, and throughput at the service and system level. Without this data, you cannot make informed design choices.