Splitting a monolith into micro services: lessons from streaming
What a high-traffic streaming platform taught us about decomposing a monolith without breaking it.
“Split the monolith” is easy to say and easy to get wrong. Here’s what scaling a high-traffic streaming platform taught us about doing it without breaking production.
Find seams, don’t draw boxes
The worst micro-service boundaries come from an org chart. The best come from the natural seams in the domain — places where data and responsibility already separate cleanly. Start there, extract one service, and prove the pattern before you multiply it.
An orchestration layer earns its keep
When many clients — web, mobile, OTT — need different shapes of the same data, a thin orchestration API in front of the services saves every client from knowing the whole topology. On maxdome this orchestration layer was the single most valuable piece we built.
Deployment is part of the architecture
Micro services without automated pipelines just multiply your operational pain. The decomposition only paid off because each service had a clear, repeatable path to production. That coupling of architecture and delivery is the heart of our Backend & Microservices and Cloud & DevOps work.
Don’t split what doesn’t need splitting
Finally: a monolith is not a moral failing. Plenty of systems are better off staying together. Split when independent scaling or independent deployment actually buys you something — not because micro services are fashionable.
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