The server side of a product: business logic, database, authentication, and integrations that users never see but every feature depends on.
Speed, security, and cost of running a product are decided on the backend. Weak foundations show up later as slow pages, data inconsistencies, and expensive rewrites.
We pick the simplest architecture that fits the load — often a well-structured monolith — with typed APIs, migrations, queues for slow work, and monitoring from the first release.