Khalef Hosany
Principal Engineering Manager at Microsoft
Seattle, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolKhalef Hosany is a Principal Engineering Manager with 17+ years at Microsoft, leading global teams to deliver high-impact features across Microsoft Office and Microsoft 365. He blends product-focused engineering with strategic partnership-building—internally across Office and Windows and externally with companies like Meta—to bring technologies such as React Native to desktop platforms and to advance open-source ecosystems. His teams built the UX platform that integrated generative AI into Office and drove content provenance and watermarking initiatives to meet emerging AI transparency regulations. An early accessibility advocate, he authored cross-company accessibility tooling and patents, helped shape regulatory compliance, and presented at major conferences. Khalef is active in community building and talent development, from university outreach to growing a 1,000+ React Native community within Microsoft. Based in Seattle and serving on the React Foundation board, he combines deep product engineering chops with a rare mix of policy, standards, and cross-organizational influence.
7 years of coding experience
11 years of employment as a software developer
Master's degree, Electrical and Electronics Engineering, Master's degree, Electrical and Electronics Engineering at Columbia University
English, French
Github Skills (27)
react-native10
windows10
uwp10
surface-duo10
dotnet10
windows-app10
xbox10
react10
react-native-macos9
react-native-app9
react-native-windows9
javascript-engine9
macos9
v87
winrt6
Programming languages (5)
Github contributions (5)
microsoft/v8-jsi
Dec 2020 - Apr 2025
React Native V8 JSI adapter
Contributions:16 reviews, 3 PRs, 3 pushes in 4 years 4 months
react-native
microsoft/hermes-windows
May 2020 - Feb 2022
Hermes is a small and lightweight JavaScript engine optimized for running React Native apps..
Contributions:20 reviews, 3 commits, 16 PRs in 1 year 9 months
javascript-enginereact-native-app
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.