We write a technical specification for the project and/or each task. After delivery, we prepare training materials for the client (text, videos) and create code documentation for project support.
We write clean code according to standards for easy support and project development. We document it using the PHPDoc standard, and classes are connected according to the PSR-4 standard with composer autoload. This approach makes it easier to scale the team, as any programmer with object-oriented programming knowledge will understand our code.