Felix Schwarz
Co-Founder And Managing Director at PhantomX GmbH
Berlin, Germany
Summary
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RockstarFelix Schwarz is a Berlin-based entrepreneur and software engineer with 12 years of experience, currently co-founding and managing PhantomX GmbH. He combines hands-on front-end expertise—evidenced by contributions to React tooling like Radium and react-mentions—with leadership in building product and company strategy. His open-source work shows attention to performance and edge cases (e.g., removing nested styles and preserving custom toString behavior), reflecting a pragmatic approach to robust UI code. Comfortable with build tooling, styling systems, and component UX, he brings both technical depth and operational experience to early-stage ventures.
12 years of coding experience
German, English, French
Github Skills (12)
css10
javascript10
react-components10
mention10
react10
react-component10
jsx9
testing9
css-in-js9
styled-components8
plugin8
jestjs7
Programming languages (10)
Github contributions (5)
signavio/react-mentions
Nov 2014 - Jan 2021
@mention people in a textarea
Role in this project:
Front-end Developer
Front-end DeveloperContributions:9 releases, 7 reviews, 295 commits in 6 years 2 months
Contributions summary:Felix's commits focused on implementing components for the React Mentions library. Their work included project setup, initial implementation ideas, and build configuration tweaks. They also worked on the styling and autogrow functionality for the textarea and the display of the mentions. Further commits involved adding styling to the suggestions overlay and implementing the selection of suggestions.
ellipsistextareareactreact-componentiframe
FormidableLabs/radium
May 2016 - May 2016
A toolchain for React component styling.
Role in this project:Front-end Developer
Front-end DeveloperContributions:6 commits, 1 PR, 2 comments in 1 day
Contributions summary:Felix's contributions focus on extending the functionality of the Radium library, specifically related to style object handling. They implemented and tested a plugin to remove nested styles, preventing potential performance issues. Furthermore, the user addressed edge cases by preserving style objects with custom `toString` implementations. They also made code adjustments to adhere to linting standards.
react-componentreactstylingtoolchain
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