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Upgrading GitHub.com to MySQL 8.0

Over 15 years ago, GitHub started as a Ruby on Rails application with a single MySQL database. Since then, GitHub has evolved its MySQL architecture to meet the scaling and resiliency needs of the...

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How we organize and get things done with SERVICEOWNERS

GitHub’s primary codebase is a large Ruby on Rails monolith with over 4.2 million lines of code across roughly 30,000 files. As the platform has grown over the years, we have come to realize that we...

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How GitHub’s Developer Experience team improved innerloop development

Building confidence in new code before deploying is a crucial part of any good development loop. This is especially challenging when working in a distributed or microservice system with multiple teams...

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GitHub’s Engineering Fundamentals program: How we deliver on availability,...

How do we ensure over 100 million users across the world have uninterrupted access to GitHub’s products and services on a platform that is always available, secure, and accessible? From our beginnings...

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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...

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Fixing security vulnerabilities with AI

In November 2023, we announced the launch of code scanning autofix, leveraging AI to suggest fixes for security vulnerabilities in users’ codebases. This post describes how autofix works under the...

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

At GitHub, we use merge queue to merge hundreds of pull requests every day. Developing this feature and rolling it out internally did not happen overnight, but the journey was worth it—both because of...

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

For more on this topic, check out Alexis Lucio, Catherine McNally, and Lindsey Wild‘s axe-con 2024 talk, “Establishing a Scalable A11y Education Ecosystem,” which laid the foundation for this blog...

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

One of GitHub’s core values is Diverse and Inclusive. It is a guiding thought for how we operate, reminding us that GitHub serves a developer community that spans a wide range of geography and ability....

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How we improved push processing on GitHub

What happens when you push to GitHub? The answer, “My repository gets my changes” or maybe, “The refs on my remote get updated” is pretty much right—and that is a really important thing that happens,...

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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. It can be...

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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. The stack is complex, and even small changes can have a big ripple effect. Here’s a look at some...

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

GitHub Actions 🤝 GitHub for iOS The GitHub iOS and GitHub Actions macOS runner teams are integral parts of each other’s development inner loop. Each team partners on testing new runner images and...

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How GitHub supports neurodiverse employees (and how your company can, too)

In today’s global workplace, supporting employees by appreciating and understanding their background and lived experience is crucial for the success of any organization. This includes employees who...

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The ultimate guide to developer happiness

In today’s rapidly evolving landscape, where AI is reshaping industries and transforming workflows, the role of developers has never been more critical. As business leaders, fostering an environment...

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GitHub Enterprise Cloud with data residency: How we built the next evolution...

Today, we announced that GitHub Enterprise Cloud will offer data residency, starting with the European Union (EU) on October 29, 2024, to address a critical desire from customers and enable an...

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How to make Storybook Interactions respect user motion preferences

Recently, while browsing my company’s Storybook, I came across something that seemed broken: a flickering component that appeared to be re-rendering repeatedly. The open source tool that helps...

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Breaking down CPU speed: How utilization impacts performance

Introduction ⛵ The GitHub Performance Engineering team regularly conducts experiments to observe how our systems perform under varying load conditions. A consistent pattern in these experiments is the...

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