I am starting a new fintech project and I am torn between building a clean monolith or jumping straight into a microservices architecture. Everyone says microservices are the future for scalability, but I am worried about the overhead of managing multiple databases and inter-service communication. Is the complexity worth it for a small team starting from scratch?
3 answers
For a startup, I almost always recommend starting with a "Modular Monolith." Microservices solve organizational problems more than technical ones; they allow hundreds of developers to work on different parts of a system without stepping on each other's toes. If your team is small, the "network tax"—latency, data consistency, and complex deployments—will slow you down significantly. Build a monolith but keep your domains strictly separated. This way, when you actually hit a scaling bottleneck in one specific area, you can peel that module out into its own microservice with much less friction than starting fragmented.
If we go the monolith route, how do we ensure the database doesn't become a single point of failure as we grow?
Start small. Most successful companies, including Shopify and Instagram, started as monoliths and only moved to microservices once they had millions of users.
Agreed, Ashley. The premature adoption of microservices is a common reason why many startup backend projects fail to launch on time due to technical debt.
That is a vital concern, Gregory. You can mitigate this by using database sharding or read-replicas to distribute the load. Even in a monolith, you can use "Logical Separation," where different modules have their own schemas within the same database instance. This prevents the "spaghetti data" problem. Later, if you need to migrate a specific module to a microservice, having those separate schemas makes the data migration phase 90% easier because the boundaries are already defined.