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Building scalable business software

Scale is not just traffic. It is the ability to add the tenth feature without breaking the first nine. That starts in the data model.

Kantam EngineeringBackend & Architecture12 July 20267 min read

When people say 'scalable', they usually mean traffic. In business software, the harder kind of scale is change: can you add the tenth feature without destabilising the first nine? That resilience is designed early, in the data model and the boundaries between modules.

Model the domain, not the screen

Screens change constantly; the domain changes slowly. A dealer, an order, a product, a lead — model those cleanly and the UI can evolve freely on top. Build the data model around today's screen and every redesign becomes a migration.

Boundaries buy you speed later

  • Clear module boundaries so teams and features do not collide
  • APIs designed around the domain, not around one screen
  • Data integrity first — performance tuning comes after correctness
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