Andreas Stefl
Graduate
Vienna, Austria
Summary
👤
Senior🎓
Top SchoolAndreas Stefl is a software engineer and founder with 15 years of experience building high-performance C++ and Python systems, currently combining research at CERN with product work on a cross-platform document viewer for Android and iOS. With a Master’s in Physics and hands-on roles spanning DevOps, back-end engineering, and CI/test automation, he has contributed to prominent open-source efforts like ACTS—implementing full-chain testing and fixing critical simulation and runtime bugs. He thrives on algorithmic challenges and real-time data processing, brings embedded and graphics experience from microcontroller and simulation projects, and is actively learning Rust to broaden his systems toolkit. Based in Vienna, he blends academic rigor from his physics background with startup pragmatism and a penchant for performance and reliability.
15 years of coding experience
8 years of employment as a software developer
Vienna University of TechnologyInformation Technology, Information Technology at HTL Rennweg
Stackoverflow
86reputation
1kreached
5answers
1question
Github Skills (16)
simulations10
tracks10
simulation10
c-language10
cprogramming-language10
cicd10
testing10
python9
data-analysis8
rootkit7
root-finding7
java6
bitmap6
javascript6
command-line6
Programming languages (15)
Github contributions (5)
acts-project/acts
May 2022 - Jan 2023
Experiment-independent toolkit for (charged) particle track reconstruction in (high energy) physics experiments implemented in modern C++
Role in this project:
Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:3504 reviews, 73 commits, 904 PRs in 8 months
Contributions summary:Andreas primarily contributed to the Continuous Integration (CI) and testing infrastructure by adding and modifying scripts for automated testing. They implemented a full-chain testing process to validate the experiment-independent toolkit for charged particle track reconstruction, ensuring the software's functionality. The user also addressed a critical bug related to simulation and corrected a GCC runtime error, indicating their involvement in code maintenance and debugging. Furthermore, they updated example scripts and added a new feature related to EDM4hep IO.
cppparticle-track-reconstructionreconstructionphysics-experimentsimulation
andiwand/clock-synchronization-thesis
Aug 2017 - Apr 2025
Contributions:4 releases, 16 pushes, 1 branch in 7 years 9 months
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