Build software for the next person.

Keep the reason beside the decision

A system is easier to change when the next person understands why it was built that way. Record consequential decisions: where the source of truth lives, why a workflow has an exception, or which constraint shaped an integration.

Documentation does not need to repeat the code. It should explain context that the code alone cannot show. A short, current decision record can be more useful than a large handover document that nobody maintains.

Make the ordinary tasks repeatable

Someone should be able to set up the application, run the relevant checks, and prepare a release without relying on a private conversation. Keep configuration requirements and operational instructions close to the project.

Document which credentials are required and how they are provided without storing the secrets in the repository. Identify external services and who owns the relevant business accounts.

• A reproducible local setup and a clear configuration example.
• Useful checks for important business rules and user journeys.
• A documented release process and a recovery approach.
• Named ownership for infrastructure, access, and routine updates.

Build visibility into the workflow

When something goes wrong, the system should help an operator understand where and why. A failed integration needs a visible state and an appropriate recovery path. A silent failure forces people to reconstruct the event through scattered records.

Operational information should be useful without exposing unnecessary personal or sensitive data. Think about the people reading errors and the decisions they will need to make.

Make handover part of delivery

Handover is easier when it is prepared throughout the project. Review the repository, configuration, access arrangements, and documentation before the launch rush. Walk through ordinary operations and a plausible failure with the people responsible after delivery.

Maintainability is a practical investment in future work. A clear foundation allows a team to assess a change, understand its consequences, and make it with fewer unanswered questions.