Fabian Jäger
CTO & Co-Founder at Mailbutler GmbH
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolFabian Jäger is a seasoned software leader and entrepreneur with 13 years of experience building productivity and email tooling as CTO and Co‑Founder of Mailbutler in Berlin. He previously founded ChungwaSoft, shipping Mac utilities and VPN client software, and combines product-first thinking with hands-on engineering. His background in video coding research at RWTH Aachen and contributions to open-source projects like the YUView viewer reflect deep systems and graphics expertise alongside practical refactoring skills. Known for simplifying complex codebases, he balances architecture, backend engineering and product delivery to keep teams lean and maintainable. Fluent in both research-driven algorithm work and customer-facing SaaS, he brings a rare blend of academic rigor and startup pragmatism.
13 years of coding experience
7 years of employment as a software developer
Engineer's Degree Computer Engineering, Engineer's Degree Computer Engineering at RWTH Aachen UniversityEngineering/Industrial Management, Engineering/Industrial Management at Chalmers University of Technology
German, English, Spanish, Swedish, French
Stackoverflow
467reputation
26kreached
2answers
11questions
Github Skills (18)
c-language10
refactor10
refactoring10
cprogramming-language10
video-player9
playback9
media-playback9
videojs9
qt8
coreanimation6
commoncrypto6
database6
encryption6
docker6
cocoa6
Programming languages (14)
Github contributions (5)
IENT/YUView
Dec 2014 - Apr 2015
The Free and Open Source Cross Platform YUV Viewer with an advanced analytics toolset
Role in this project:
Backend Developer
Backend DeveloperContributions:108 commits, 56 pushes, 1 branch in 3 months
Contributions summary:Fabian focused on a radical cleanup of the OpenGL backend and other renderers, which involved removing these components from the `renderwidget.cpp` file. This indicates a significant refactoring effort. The changes streamlined and simplified rendering aspects, reducing the project's complexity by removing features. The user's work shows a strong understanding of the project's architecture and a focus on code maintainability.
hevcanalyticsraw-videoanalysisyuv-player
Mailbutler/omniauth-microsoft_graph
Jun 2018 - Mar 2025
An Omniauth strategy for the Microsoft Graph Api.
Contributions:8 pushes in 6 years 10 months
apiomniauth-strategyomniauthstrategymicrosoft-graph
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