CEO Thomas Dohmke Says Auf Wiedersehen to GitHub, As Platform Joins Microsoft’s Powerful CoreAI Team

A Major Leadership Change at GitHub

In a heartfelt farewell titled “Auf Wiedersehen, GitHub ♥️”, GitHub CEO Thomas Dohmke announced today (August 11, 2025) that he will step down from his role at the end of the year to launch his next startup. The surprise move marks the end of a transformative era for GitHub under his leadership — a period defined by explosive growth, AI-driven innovation, and deeper integration with Microsoft’s engineering ecosystem.

Dohmke, who first joined Microsoft after the tech giant acquired his startup over a decade ago, worked his way through multiple leadership roles before becoming GitHub’s chief executive in 2021. In his internal memo to “Hubbers” — GitHub’s global workforce — Dohmke emphasized that the company is stronger than ever, with over 150 million developers, more than 1 billion repositories, and a rapidly accelerating AI strategy led by GitHub Copilot.

From Startup Founder to GitHub’s Visionary Leader

Thomas Dohmke’s story with Microsoft began when he sold his startup to the company in the early 2010s, leading his family to move from Germany to the United States. Over the years, Dohmke became one of the most influential figures in developer tooling, helping shape Microsoft’s position in the open-source community.

Notably, he worked closely with former GitHub CEO Nat Friedman during Microsoft’s $7.5 billion acquisition of the platform in 2018 and later became the CEO himself, tasked with steering GitHub during a period of rapid AI-driven change.

Under his watch, GitHub evolved from a simple code-hosting site to a full-fledged AI coding platform and a leader in developer productivity tools, all while maintaining its open-source roots.

GitHub’s Growth Under Thomas Dohmke

The stats speak for themselves:

• Over 150 million developers now use GitHub, making it the largest developer platform in the world.

• More than 1 billion repositories and forks are hosted on the platform.

• GitHub Actions usage exploded to 3 billion minutes per month, growing 64% year-over-year, solidifying its status as the world’s leading CI/CD service.

• GitHub Advanced Security reduced the mean time to remediate vulnerabilities by 60%, helping teams fix security issues three times faster.

• GitHub expanded its global cloud presence, launching in the EU, Australia, and achieving FedRAMP certification in the U.S. for government-related projects.

The Copilot Revolution

Perhaps Dohmke’s greatest legacy is the rise of GitHub Copilot, the AI-powered coding assistant that has transformed software development.

When Copilot first launched in 2021, it was a magical but simple autocomplete tool powered by OpenAI’s Codex model. Under Dohmke’s leadership, it exploded into a multi-model AI platform that integrates conversational coding (Copilot Chat & Voice), full code review and debugging capabilities, and even full-stack app generation via GitHub Spark.

Some important milestones of GitHub Copilot in recent years include:

• Expanding partnerships beyond OpenAI to also include Anthropic and Google DeepMind for diversified AI models.

• Launching Copilot Free for millions of developers.

• Introducing asynchronous coding agents on GitHub and synchronous agent mode in Visual Studio Code.

• Scaling to more than 20 million Copilot users worldwide.

Dohmke has called Copilot “the greatest change to software development since the advent of the personal computer,” believing it will help enable one billion developers powered by billions of AI agents in the future.

Integration into Microsoft CoreAI

With Dohmke’s departure, GitHub will become part of Microsoft’s CoreAI organization, signaling even closer integration between the GitHub platform and Microsoft’s broader AI initiatives.

Microsoft has invested heavily in AI across its product suite — from Copilot in Office to Azure AI services — and absorbing GitHub under CoreAI could streamline AI model development, enhance interoperability between GitHub and Azure DevOps, and strengthen its competitive advantage against rivals like AWS CodeCatalyst and Google Cloud’s AI developer tools.

No successor has been officially named yet, but Microsoft is expected to appoint an interim CEO by early Q4 2025 to facilitate a smooth transition.

Dohmke’s Next Chapter

While Dohmke did not reveal specifics about his new company, he hinted that his startup roots have been “tugging” at him and that he is eager to return to building something from scratch. His track record suggests it will likely involve developer tools, AI, or both.

Industry insiders speculate that Dohmke could focus on next-generation AI coding agents or developer collaboration platforms, areas where he has been a pioneer at GitHub.

Regardless, he will remain at GitHub until the end of 2025 to assist with the transition.

What This Means for Developers

For GitHub’s 150 million-strong developer community, Dohmke’s departure is a symbolic moment — but the company’s trajectory appears secure.

• GitHub’s leadership team is stable, and Microsoft’s financial backing ensures continued investment in AI-driven tools.

• Copilot’s roadmap remains aggressive, with planned expansions into embedded development, game design, and even low-code/no-code platforms.

• The company’s commitment to open source continues to be central to its mission, even as it diversifies its revenue streams with enterprise offerings like GitHub Enterprise Cloud.

Industry experts believe that integrating GitHub more deeply within Microsoft’s AI operations could actually accelerate innovation, shortening the time from AI research breakthroughs to developer-ready tools.

Final Thoughts

Thomas Dohmke’s farewell to GitHub is not just a leadership change — it’s the closing of a chapter in the evolution of modern software development. Under his guidance, GitHub has:

• Cemented its position as the world’s largest and most influential developer platform.

• Championed AI-assisted coding, turning Copilot into the market leader.

• Expanded globally while strengthening security and compliance.

Now, with its integration into Microsoft’s CoreAI group, GitHub is poised for an even deeper role in shaping the future of software development — one where AI not only assists developers but collaborates with them as a true coding partner.

As Dohmke signs off with his whimsical reference to The Hitchhiker’s Guide to the Galaxy — “So long, and thanks for all the fish” — the developer world watches closely to see what his next adventure will be, and how GitHub’s next leaders will carry forward his vision.