Oleksandr Fediashov
Principal Software Engineer at Microsoft
Prague, Prague, Czechia
Summary
🤩
Rockstar🎓
Top SchoolOleksandr Fediashov is a Principal Software Engineer at Microsoft Prague with a decade of experience building accessible, high-performance frontend systems and design systems. He spearheads Fluent UI component and tooling development—co-designing APIs and maintaining Griffel, an ahead-of-time CSS-in-JS engine used across Microsoft. A frequent OSS contributor, he has contributed core components to Semantic UI React and improvements to projects like Linaria and Fela, demonstrating deep expertise in CSS-in-JS, build tooling, and React ecosystems. Oleksandr combines hands-on implementation (from icons and components to Babel/Webpack plugins) with public speaking and content creation, helping shape both developer experience and product quality. Notably, his background includes performance-driven backend work (ClickHouse, Go) early in his career, giving him a pragmatic full-stack sensibility.
10 years of coding experience
8 years of employment as a software developer
Specialist, Computer Engineering, Programming and Cyber Security, Specialist, Computer Engineering, Programming and Cyber Security at Odessa National Academy of Food Technologies
Русский, Английский
Stackoverflow
4,317reputation
635kreached
69answers
0questions
react-router
top-5%
responsive-design
top-5%
javascript
top-5%
user-interface
top-5%
Github Skills (38)
babel610
styles10
javascript10
stylesheets10
ui-components10
testing10
css-in-js10
css10
typescript10
file-icons10
webpack10
component-kit10
front-end-development10
glyph-icons10
webpacker10
Programming languages (10)
Github contributions (5)
microsoft/griffel
Jan 2022 - Jan 2023
CSS-in-JS with ahead-of-time compilation ⚡️
Role in this project:
Front-end Developer
Front-end DeveloperContributions:582 reviews, 186 commits, 595 PRs in 1 year
Contributions summary:Oleksandr's commits primarily focused on initializing and setting up the project's structure and core components for a CSS-in-JS library. They initialized the project with yarn, initiated a core package, and added custom typings for the environment. The user also implemented the initial React component and added a React implementation. Furthermore, they added support for CSS extraction by creating a Babel preset and Webpack loader, indicating their involvement in build-time optimization and tooling.
reactcompilationahead-of-timecsscss-in-js
Semantic-Org/Semantic-UI-React
Jul 2016 - Dec 2022
The official Semantic-UI-React integration
Role in this project:Front-end Developer
Front-end DeveloperContributions:19 releases, 43 reviews, 633 commits in 6 years 6 months
Contributions summary:Oleksandr primarily contributed to the development of UI components within the Semantic UI React library. Their work included implementing new components such as the Flag, Loader, Rail, and Breadcrumb components, as well as enhancements to existing components such as the Image. The user's commits focused on creating the HTML and CSS structure for these UI elements, implementing features, adding and modifying CSS, and writing tests using test frameworks like Jest.
react-libraryjavascript-libraryjs-libraryfrontend-componentsreact
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