When a modular monolith beats microservices
Microservices solve real problems. Most growing products do not have those problems yet.
Splitting a product into many small services can look like the grown-up way to build software. For large organisations with many teams, it often is. For a product with one or two teams, it usually adds cost before it adds value.
What microservices cost
Every service needs its own deployment, monitoring, data and error handling. Features that cross services need coordination, and a simple change can touch three code bases. That overhead is worth paying when independent teams need to release on their own schedules. Until then, it slows everyone down.
What a modular monolith gives you
A modular monolith is one application with clear boundaries inside it: billing, scheduling and reporting each live in their own module, with their own rules and a small, deliberate interface to the rest. You deploy one thing, debug one thing and keep one source of truth.
Boundaries first, services later
The modules are the hard part, and they are just as useful inside one application. If a module later needs to scale on its own or move to its own team, its boundary is already there, and splitting it out is a project, not a rewrite.
When to reconsider
- Several teams are blocking each other's releases.
- One part of the product needs very different scaling or reliability.
- A module has a clear owner and a stable interface.
If none of these is true yet, a well-organised monolith is probably the faster path.
Written by the OneSyntax team
