Engineering

Over the course of a year, GitHub’s engineers make millions of commits across all of our internal repositories, process billions of API requests, and run tens of thousands of deployments across the internal apps that power GitHub’s services. We use many of GitHub’s products and plenty of other open source tools to operate at this scale. Here’s an inside look into how we do it.

Featured

How GitHub reduced testing time for iOS apps with new runner features

Learn how GitHub used macOS and Apple Silicon runners for GitHub Actions to build, test, and deploy our iOS app faster.

How we improved availability through iterative simplification

Solving and staying ahead of problems when scaling up a system of GitHub’s size is a delicate process. Here’s a look at some of the tools in GitHub’s toolbox, and how we’ve used them to solve problems.

Exploring the challenges in creating an accessible sortable list (drag-and-drop)

Drag-and-drop is a highly interactive and visual interface. We often use drag-and-drop to perform tasks like uploading files, reordering browser bookmarks, or even moving a card in solitaire.

How we improved push processing on GitHub

Pushing code to GitHub is one of the most fundamental interactions that developers have with GitHub every day. Read how we have significantly improved the ability of our monolith to correctly and fully process pushes from our users.

Latest

How we’re building more inclusive and accessible components at GitHub

We’ve made improvements to the way users of assistive technology can interact with and navigate lists of issues and pull requests and tables across GitHub.com.

Empowering accessibility: GitHub’s journey building an in-house Champions program

As part of GitHub’s dedication to accessibility, we expanded our internal accessibility program and scaled up our assessment process to help remove or lower barriers for users with disabilities. Then, we empowered employees from various disciplines to drive accessibility efforts within their teams.

How GitHub uses merge queue to ship hundreds of changes every day

Here’s how merge queue transformed the way GitHub deploys changes to production at scale, so you can do the same for your organization.

Fixing security vulnerabilities with AI

A peek under the hood of GitHub Advanced Security code scanning autofix.

Bringing npm registry services to GitHub Codespaces

The npm engineering team recently transitioned to using GitHub Codespaces for local development for npm registry services. This shift to Codespaces has substantially reduced the friction of our inner development loop and boosted developer productivity.