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+---
+stage: none
+group: Development
+info: "See the Technical Writers assigned to Development Guidelines: https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments-to-development-guidelines"
+---
+
+# Feature development
+
+Consult these topics for information on contributing to specific GitLab features.
+
+## UX and Frontend guides
+
+- [GitLab Design System](https://design.gitlab.com/), for building GitLab with
+  existing CSS styles and elements
+- [Frontend guidelines](fe_guide/index.md)
+- [Emoji guide](fe_guide/emojis.md)
+
+## Backend guides
+
+### General
+
+- [Directory structure](directory_structure.md)
+- [GitLab EventStore](event_store.md) to publish/subscribe to domain events
+- [GitLab utilities](utilities.md)
+- [Newlines style guide](newlines_styleguide.md)
+- [Logging](logging.md)
+- [Dealing with email/mailers](emails.md)
+- [Kubernetes integration guidelines](kubernetes.md)
+- [Permissions](permissions.md)
+- [Code comments](code_comments.md)
+- [Windows Development on GCP](windows.md)
+- [FIPS compliance](fips_compliance.md)
+- [`Gemfile` guidelines](gemfile.md)
+- [Ruby upgrade guidelines](ruby_upgrade.md)
+
+### Things to be aware of
+
+- [Gotchas](gotchas.md) to avoid
+- [Avoid modules with instance variables](module_with_instance_variables.md), if
+  possible
+- [Guidelines for reusing abstractions](reusing_abstractions.md)
+- [Ruby 3 gotchas](ruby3_gotchas.md)
+
+### Rails Framework related
+
+- [Routing](routing.md)
+- [Rails initializers](rails_initializers.md)
+- [Mass Inserting Models](mass_insert.md)
+- [Issuable-like Rails models](issuable-like-models.md)
+- [Issue types vs first-class types](issue_types.md)
+- [DeclarativePolicy framework](policies.md)
+- [Rails update guidelines](rails_update.md)
+
+### Debugging
+
+- [Pry debugging](pry_debugging.md)
+- [Sidekiq debugging](../administration/troubleshooting/sidekiq.md)
+
+### Git specifics
+
+- [How Git object deduplication works in GitLab](git_object_deduplication.md)
+- [Git LFS](lfs.md)
+
+### API
+
+- [API style guide](api_styleguide.md) for contributing to the API
+- [GraphQL API style guide](api_graphql_styleguide.md) for contributing to the
+  [GraphQL API](../api/graphql/index.md)
+
+### GitLab components and features
+
+- [Developing against interacting components or features](interacting_components.md)
+- [Manage feature flags](feature_flags/index.md)
+- [Licensed feature availability](licensed_feature_availability.md)
+- [Accessing session data](session.md)
+- [How to dump production data to staging](db_dump.md)
+- [Geo development](geo.md)
+- [Redis guidelines](redis.md)
+  - [Adding a new Redis instance](redis/new_redis_instance.md)
+- [Sidekiq guidelines](sidekiq/index.md) for working with Sidekiq workers
+- [Working with Gitaly](gitaly.md)
+- [Elasticsearch integration docs](elasticsearch.md)
+- [Working with merge request diffs](diffs.md)
+- [Approval Rules](approval_rules.md)
+- [Repository mirroring](repository_mirroring.md)
+- [Uploads development guide](uploads/index.md)
+- [Auto DevOps development guide](auto_devops.md)
+- [Renaming features](renaming_features.md)
+- [Code Intelligence](code_intelligence/index.md)
+- [Feature categorization](feature_categorization/index.md)
+- [Wikis development guide](wikis.md)
+- [Image scaling guide](image_scaling.md)
+- [Cascading Settings](cascading_settings.md)
+- [Shell commands](shell_commands.md) in the GitLab codebase
+- [Value Stream Analytics development guide](value_stream_analytics.md)
+- [Application limits](application_limits.md)
+
+### Import and Export
+
+- [Working with the GitHub importer](github_importer.md)
+- [Import/Export development documentation](import_export.md)
+- [Test Import Project](import_project.md)
+- [Group migration](bulk_import.md)
+- [Export to CSV](export_csv.md)
+
+## Performance guides
+
+- [Performance guidelines](performance.md) for writing code, benchmarks, and
+  certain patterns to avoid.
+- [Caching guidelines](caching.md) for using caching in Rails under a GitLab environment.
+- [Merge request performance guidelines](merge_request_performance_guidelines.md)
+  for ensuring merge requests do not negatively impact GitLab performance
+- [Profiling](profiling.md) a URL or tracking down N+1 queries using Bullet.
+- [Cached queries guidelines](cached_queries.md), for tracking down N+1 queries
+  masked by query caching, memory profiling and why should we avoid cached
+  queries.
+
+## Database guides
+
+See [database guidelines](database/index.md).
+
+## Integration guides
+
+- [Integrations development guide](integrations/index.md)
+- [Jira Connect app](integrations/jira_connect.md)
+- [Security Scanners](integrations/secure.md)
+- [Secure Partner Integration](integrations/secure_partner_integration.md)
+- [How to run Jenkins in development environment](integrations/jenkins.md)
+- [How to run local `Codesandbox` integration for Web IDE Live Preview](integrations/codesandbox.md)
+
+## Testing guides
+
+- [Testing standards and style guidelines](testing_guide/index.md)
+- [Frontend testing standards and style guidelines](testing_guide/frontend_testing.md)
+
+## Refactoring guides
+
+- [Refactoring guidelines](refactoring_guide/index.md)
+
+## Deprecation guides
+
+- [Deprecation guidelines](deprecation_guidelines/index.md)
+
+## Documentation guides
+
+- [Writing documentation](documentation/index.md)
+- [Documentation style guide](documentation/styleguide/index.md)
+- [Markdown](../user/markdown.md)
+
+## Internationalization (i18n) guides
+
+- [Introduction](i18n/index.md)
+- [Externalization](i18n/externalization.md)
+- [Translation](i18n/translation.md)
+
+## Product Intelligence guides
+
+- [Product Intelligence guide](https://about.gitlab.com/handbook/product/product-intelligence-guide/)
+- [Service Ping guide](service_ping/index.md)
+- [Snowplow guide](snowplow/index.md)
+
+## Experiment guide
+
+- [Introduction](experiment_guide/index.md)
+
+## Build guides
+
+- [Building a package for testing purposes](build_test_package.md)
+
+## Compliance
+
+- [Licensing](licensing.md) for ensuring license compliance
+
+## Domain-specific guides
+
+- [CI/CD development documentation](cicd/index.md)
+
+## Technical Reference by Group
+
+- [Create: Source Code BE](backend/create_source_code_be/index.md)
+
+## Other development guides
+
+- [Defining relations between files using projections](projections.md)
+- [Reference processing](reference_processing.md)
+- [Compatibility with multiple versions of the application running at the same time](multi_version_compatibility.md)
+- [Features inside `.gitlab/`](features_inside_dot_gitlab.md)
+- [Dashboards for stage groups](stage_group_observability/index.md)
+- [Preventing transient bugs](transient/prevention-patterns.md)
+- [GitLab Application SLIs](application_slis/index.md)
+- [Spam protection and CAPTCHA development guide](spam_protection_and_captcha/index.md)
+
+## Other GitLab Development Kit (GDK) guides
+
+- [Run full Auto DevOps cycle in a GDK instance](https://gitlab.com/gitlab-org/gitlab-development-kit/blob/main/doc/howto/auto_devops.md)
+- [Using GitLab Runner with the GDK](https://gitlab.com/gitlab-org/gitlab-development-kit/blob/main/doc/howto/runner.md)
+- [Using the Web IDE terminal with the GDK](https://gitlab.com/gitlab-org/gitlab-development-kit/-/blob/main/doc/howto/web_ide_terminal_gdk_setup.md)