Tim Theisen
Senior Systems Programmer at University of Wisconsin-Madison
Wisconsin, United States
Summary
👤
Senior🎓
Top SchoolTim Theisen is a Senior Systems Programmer with 13+ years focused on high-performance, cluster and parallel computing, currently serving as Release Manager for HTCondor and the Open Science Grid at the University of Wisconsin–Madison. He designs and implements complex multi-threaded, distributed systems with an emphasis on cross-platform portability, debugging, and performance tuning, and has a proven track record of migrating critical clinical and imaging software to more robust Linux cluster deployments. Tim’s open-source contributions to the prominent HTCondor project include work on file transfer correctness, container support, and schedd performance, reflecting deep backend and release-management expertise. Earlier roles span from real-time trading systems to medical device dose-calculation optimization—where he delivered a 24x speedup and half-million-dollar licensing savings—showing a blend of practical engineering and cost-aware architecture. Based in Wisconsin, he’s comfortable leading cross-functional teams and resolving thorny production issues that span software, hardware, and operational processes.
13 years of coding experience
34 years of employment as a software developer
Monona GroveMSEE, Computer Engineering, MSEE, Computer Engineering at University of Wisconsin-Madison
Stackoverflow
46reputation
906reached
1answer
0questions
Github Skills (15)
c-language10
cprogramming-language10
version-control9
file-transfer9
git9
computer-engineering8
containerization7
testing7
code-cleanup7
docker7
container7
maintenance7
condor6
operating-system6
amazon-linux6
Programming languages (11)
Github contributions (5)
htcondor/htcondor
Jun 2013 - Jan 2023
HTCondor source repository, formerly the Condor Project
Role in this project:
Back-end Developer
Back-end DeveloperContributions:100 releases, 444 reviews, 3801 commits in 9 years 9 months
Contributions summary:Tim's contributions primarily involved merging and resolving conflicts from multiple branches within the HTCondor project. They made changes related to file transfer functionality, particularly around handling output and error streams, and ensured that directory creation was handled correctly for remapped file transfers. Their work extended to fixing issues in the container universe for Apptainer and Docker images, as well as improving the performance of the schedd.
slurmdistributed-computingdistributed-systemshpchtcondor
opensciencegrid/release-tools
May 2016 - Mar 2025
Convenience scripts for the OSG Release process
Contributions:3 reviews, 46 PRs, 239 pushes in 8 years 11 months
convenienceosg
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