Rebecca Kwok enhanced the developer onboarding process for the opensafely-core/airlock repository by updating and clarifying setup documentation. She focused on improving the reliability of test execution by specifying that tests require a clean checkout and by adding explicit commands for frontend asset setup and documentation building. Using Markdown for documentation and drawing on her skills in developer setup, Rebecca addressed issues that previously hindered new contributors, such as missing prerequisites for running tests. Her work provided clearer guidance for developers, reducing setup errors and accelerating safe contributions. The changes were targeted, addressing a specific pain point with practical, well-documented solutions.