Marcin Juraszek
Principal Architect at Microsoft
Bellevue, Washington, United States
Summary
👤
Senior🎓
Top SchoolMarcin Juraszek is a Principal Architect at Microsoft with 12 years of experience designing large-scale extensibility and real-time collaboration platforms across M365 and Office Online. He leads cross-organizational teams building SDKs and internal libraries that let first- and third-party developers light up new experiences for millions of users, while preserving consistent developer and end-user interfaces. His background spans systems architecture, performance tuning and reliability engineering—work that reduced memory allocations, GC pauses and cloud costs for Word Online and enabled real-time coauthoring across apps. Marcin is also an active contributor to the Microsoft Teams JavaScript library, where he improved initialization flows and refactored APIs for robustness across frame contexts. Based in Bellevue, WA, he blends hands-on implementation with strategic advising (including CTO-level technical advising) and a history of shipping high-profile demos like the Fluid Framework showcase at Microsoft Build.
12 years of coding experience
11 years of employment as a software developer
Master of Science - MS, Computer Science, Master of Science - MS, Computer Science at The Silesian University of Technology
English, Polish
Stackoverflow
124,856reputation
10.7mreached
2,748answers
24questions
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Github Skills (75)
linq10
windows-phone10
vbnet10
asp-net10
entity-framework10
javascript10
sql10
linq-to-xml10
dictionary10
generics10
linq-to-entities10
css10
xml10
microsoft-teams10
react10
Programming languages (11)
Github contributions (5)
OfficeDev/microsoft-teams-library-js
Mar 2021 - Oct 2022
JavaScript library for use by Microsoft Teams apps
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:386 reviews, 48 commits, 85 PRs in 1 year 7 months
Contributions summary:Marcin primarily contributed to the development and testing of the Microsoft Teams JavaScript library. Their work included implementing app initialization flows, including `app.notifyAppLoaded` and `app.notifySuccess`, within a test application. They also addressed issues by modifying the test app components and updating the core library to include features like hostName in context. Furthermore, they refactored APIs to use new React components and restricted certain functions to specific FrameContexts to improve the library's robustness.
microsoft-teamsjavascript-libraryjavascriptnodejsmicrosoft
MarcinJuraszek/DateTimeFormatInfo
Jan 2015 - Sep 2017
Contributions:12 commits, 2 PRs, 8 pushes in 2 years 7 months
datetimestringstring-formatneverdatetime-format
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