Felix Kästner
Senior Developer at SAP
Dresden, Saxony, Germany
Summary
👤
Senior🎓
Top SchoolFelix Kästner is a senior software engineer based in Dresden with nine years of professional experience and a strong focus on cloud-native engineering. He has held backend and infrastructure roles across startups and enterprise teams, including Senior Developer at SAP and Senior Backend Developer at ABOUT YOU, and has freelance experience delivering production services. Felix pairs a formal Computer Science education (BSc and MSc from TU Dresden) with hands-on contributions to open-source front-end tooling—most notably implementing a draggable track feature and E2E tests in the popular react-range component. He excels at bridging front-end usability and robust backend systems, bringing accessibility and testability into shipped features. Known for tackling cross-cutting infrastructure and delivery challenges, he thrives in teams modernizing cloud platforms and developer workflows. Colleagues describe him as pragmatic, detail-oriented, and curious about improving both developer and end-user experiences.
9 years of coding experience
6 years of employment as a software developer
Master of Science - MS Computer Science, Master of Science - MS Computer Science at Technische Universität Dresden
English, German
Github Skills (14)
typescript10
javascript10
react-components10
ranges10
typescripts10
component-kit10
react10
typescript-types10
react-component10
draggable10
testing9
e2e-test9
sliders9
e2e-testing9
Programming languages (12)
Github contributions (5)
tajo/react-range
Sep 2020 - Oct 2020
🎚️Range input with a slider. Accessible. Bring your own styles and markup.
Role in this project:
Front-end Developer
Front-end DeveloperContributions:8 commits, 2 PRs, 9 comments in 22 days
Contributions summary:Felix primarily contributed to the implementation of the `draggableTrack` feature within the `react-range` component. They added functionality to allow dragging the entire track to adjust values, and also enabled dragging individual thumbs. The contributions include significant modifications to the core `Range.tsx` component, and examples, as well as the addition of end-to-end tests for the draggable track functionality. The user also fixed a track background issue.
reactaccessible-sliderrange-inputaccessibleslider
ordered-online/apps
Oct 2019 - Jan 2020
Web client and mobile app for the ordered.online
Contributions:1 release, 2 PRs, 114 pushes in 3 months
mobile-appweb-clientreactordered
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