Fabian Jäger
CTO Co-Founder at Mailbutler GmbH
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolFabian Jäger is a Berlin-based CTO and co-founder with 12 years of software engineering experience who leads product and engineering at Mailbutler. He blends academic research in video compression and 3D video coding from RWTH Aachen with hands-on product engineering and Mac-focused consumer utilities as the founder of ChungwaSoft. His background spans image processing, backend systems and usability-focused tooling, with a track record of shipping practical email productivity and VPN client solutions. Active in open source, he contributed a significant refactor to the YUView renderer—removing legacy OpenGL complexity to improve maintainability—demonstrating a pragmatic approach to simplifying systems. That combination of research-grade algorithms and product-minded engineering drives how he balances technical debt, performance and user value.
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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