5 min readSEYON Insights
Application work for healthcare teams often starts as a page that queries a database directly. That is fast until the second client appears, or until a rule has to change without a visual redesign. A clearer split is a frontend, an API layer, business logic, a database, and the cloud platform underneath.
Put rules where they can be tested
Validation, authorization checks, and workflow transitions belong in the API and domain layer, not only in the browser. The database enforces integrity. The frontend collects input and explains errors. Microservices are optional. A modular application with a stable API is enough for many programs and is easier to operate.
Plan for the life after launch
Testing, deployment, and maintenance are part of the build. Include authentication with the organization identity provider, structured logs, and a way to migrate the schema. Modernization projects can keep the database and replace the client, or keep the client and replace the integration behind it. Write down which part is allowed to change.