Prominent open source advocate Miguel de Icaza is leaving Microsoft, which he joined in 2016 when it acquired Xamarin
Former Xamarin cofounder Miguel de Icaza is leaving Microsoft, the company he joined through acquisition just over six years ago. — Well-known open source advocate …
Context & Ripple Effects
Miguel de Icaza arrived at Microsoft the usual way: through an acquisition. Microsoft bought his mobile-development-tools startup Xamarin in early 2016 for a reported $400M-$500M, then within weeks folded Xamarin into Visual Studio for free and open-sourced its runtime — absorbing the technology into the platform rather than keeping it as a standalone business.
His departure thins out what was already a small founder cohort. Cofounder Nat Friedman went the other direction inside the company, taking over GitHub after Microsoft's $7.5B acquisition; with de Icaza gone, neither Xamarin founder remains in the product organization he helped build.
First-order effects
- Microsoft loses its most visible bridge to the Mono and .NET open source communities — de Icaza was the human link between the Xamarin user base and Redmond's developer division.
- The Xamarin lineage inside Microsoft is now entirely founder-free, with the tooling living on as integrated Visual Studio features rather than a championed product line.
Second-order effects
- With both Xamarin cofounders exited or reassigned — Friedman to GitHub, de Icaza out the door — Microsoft's cross-platform developer outreach shifts from individual evangelists to institutional channels.
- Rival cross-platform frameworks gain an opening to court developers who followed de Icaza personally rather than the Xamarin brand.
Third-order effects
- If the pattern holds, acqui-hired founders leave Microsoft within a few years of their technology being absorbed — a cycle the later departure of GitHub CEO Thomas Dohmke into Microsoft's CoreAI organization extends from tools all the way up to acquired platforms.
- The structural implication is that Microsoft increasingly retains codebases and communities while the founder relationships that came with them dissipate, raising the stakes on how it stewards open source goodwill without its original advocates.
The trend: Microsoft's acquisition-built developer leadership keeps churning out as deals mature from founder-led startups into absorbed platform components.