Start with the workflow
A feature can solve a local problem without solving the workflow around it. Before choosing a library or writing a controller, it helps to identify the people, permissions, data and integrations that make the feature useful.
Make boundaries intentional
Simple interfaces and clear contracts give a system room to evolve. A well-scoped module is easier to test, explain, replace and connect to other products.
Optimize for the next person
Good engineering includes readable documentation, recoverable failures and interfaces people can actually operate. Complexity belongs inside the system, not on the shoulders of its users.