# Development

- [Architecture](architecture.md) of GitLab
- [Shell commands](shell_commands.md) in the GitLab codebase
- [Rake tasks](rake_tasks.md) for development
- [CI setup](ci_setup.md) for testing GitLab
- [Sidekiq debugging](sidekiq_debugging.md)
- [UI guide](ui_guide.md) for building GitLab with existing css styles and elements
- [Migration Style Guide](migration_style_guide.md) for creating safe migrations
