Karel Rymeš
Principal Engineering Manager at Microsoft
Prague, Czechia
Summary
🤩
Rockstar🎓
Top SchoolKarel Rymeš is a Principal Engineering Manager at Microsoft with 9 years of experience building secure, high-scale distributed systems and leading cross-functional teams of 20+ engineers. He oversees core authentication libraries used by 150+ teams for Teams and Skype, combining product vision, API design, developer experience, and privacy-first operations. Hands-on technically, he has shipped Azure-based identity services and a C# SDK adopted across Microsoft, while contributing to prominent open-source UI work such as Fluent UI’s Datepicker improvements. Karel’s leadership emphasizes clarity, ownership, and long-term maintainability, empowering engineers through trust and strong communication. Based in Prague, he stays close to systems design, cloud infrastructure, and large-scale service operations, and brings a rare blend of operational rigor and developer empathy to security-sensitive platforms.
9 years of coding experience
5 years of employment as a software developer
Exchange year in the US with ASSIST during High School, Exchange year in the US with ASSIST during High School at Wyoming SeminaryErasmus Exchange, Computer Science, Erasmus Exchange, Computer Science at ETH ZürichBachelor's degree, Computer Science, Bachelor's degree, Computer Science at České vysoké učení technické v Praze
English, German, Czech
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (12)
datepicker10
accessibility10
typescript10
javascript10
typescripts10
component-kit10
fluentd10
react10
typescript-types10
ui-components10
ui-design9
css9
Programming languages (4)
Github contributions (5)
microsoft/fluentui
Jun 2020 - Sep 2020
Fluent UI web represents a collection of utilities, React components, and web components for building web applications.
Role in this project:
Front-end Developer
Front-end DeveloperContributions:54 reviews, 20 commits, 22 PRs in 3 months
Contributions summary:Karel primarily contributed to the development and enhancement of Fluent UI web components, specifically focusing on the Datepicker component. Their work involved implementing new features, fixing bugs related to date input, and improving the component's overall accessibility and user experience. The user also focused on the styling and theming aspects of the Datepicker to align with the Teams design. Furthermore, they refactored and optimized existing code, including switching to native table elements for better rendering.
web-componentsreact-component-libraryreact-componentsmicrosoftui-components
rymeskar/fluentui
Jun 2020 - Oct 2020
We've moved! UI Fabric is now Fluent UI - A set of React components for building Microsoft web experiences.
Contributions:3 reviews, 9 PRs, 261 pushes in 3 months
ui-fabricreactfabricfluent-uiexperiences
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