Microservice
A small, independently deployable service that owns one bounded capability and communicates with others over the network, usually via APIs or message queues.
· Reviewed by senior engineers
A microservice is a small, independently deployable service that owns one bounded capability — payments, search, inventory, identity — and exposes it over the network. The opposite is a monolith, where every capability lives inside one deployable. Microservices became popular for scaling teams, not just scaling traffic: each service can be built, deployed and operated by a different squad.
The upside is autonomy and isolation. A failure in the search service doesn't bring down checkout. Teams pick the language and database that fit the problem. Releases happen on each service's own cadence. At the right organisational size, microservices unlock real velocity.
The downside is distributed-systems complexity, and it is significant. Network calls fail, latency adds up, transactions span services, debugging requires distributed tracing, and the deployment topology grows faster than the team. Most startups should run a monolith until pain forces them to split, and most splits should follow team and domain boundaries — not lines on a whiteboard.
Devinsta builds microservice architectures where there is a clear reason: independent scaling, separate compliance scopes, or multiple teams. We just as often consolidate over-fragmented services for clients who were sold on microservices before they needed them.