Vinzenz Feenstra
Senior Staff AI Engineer LLM Applications
Vsetín, Central Moravia, Czechia
Summary
👤
Senior🎓
Top SchoolVinzenz Feenstra is a Senior Staff AI Engineer specializing in LLM applications and agentic systems, bringing 19 years of pragmatic software engineering across C++, Go, and Python. He builds production-minded AI architectures—agent workflows, multi-model RAG/CAG pipelines, MCP servers, and tool-using agents—while prioritizing reliability, debuggability, and long-term maintainability over prototypes. His hands-on approach uses modern Python tooling and async patterns (FastAPI, Pydantic, PyTest, Ruff) and is informed by a deep systems background in large-scale backend platforms and infrastructure. Previously he contributed to prominent open-source virtualization projects like oVirt/vdsm and ovirt-engine, improving VM management, guest agent features, and console integrations. At firms from AVG to Red Hat and Barclays he solved hard production problems—race conditions, distributed upgrades, and real-time trading services—combining low-level systems rigor with applied AI experimentation. Based in Czechia, he’s actively transitioning toward full-time LLM and agent framework work while consulting on practical AI solutions.
19 years of coding experience
19 years of employment as a software developer
1996, Qualifizierender Hauptschulabschluss, 1996, Qualifizierender Hauptschulabschluss at Volksschule Feuchtwangen-Land1997, Mittlere Reife, 1997, Mittlere Reife at RealschuleCommis de Cuisine, Chef, Commis de Cuisine, Chef at Staatliche Berufsschule Rothenburg-Dinkelsbühl
English, German, Czech
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (19)
libvirt10
postgresql10
back-end-development10
python10
ovirt10
manage10
agent10
vms10
virtualization10
backend10
testing9
java9
refactor9
database-design9
javas9
Programming languages (11)
Github contributions (5)
oVirt/vdsm
Oct 2012 - Feb 2017
The Virtual Desktop Server Manager
Role in this project:
Back-end Developer
Back-end DeveloperContributions:128 commits in 4 years 4 months
Contributions summary:Vinzenz primarily contributed to the `vdsm` repository by modifying existing Python code, applying PEP-8 guidelines, adding new features to the VM management logic, and improving the code's memory usage. They also addressed bugs and regressions in unit tests, including those related to guest agent functionality and libvirt connection issues. The user also refactored and reorganized the code base, moving VDSM module files to a dedicated folder, and introducing new features like configurable console actions.
vdivmsvirtual-desktopwindowselectron
oVirt/ovirt-engine
Aug 2013 - Jan 2017
The oVirt Engine virtualization manager
Role in this project:Back-end Developer
Back-end DeveloperContributions:56 commits in 3 years 5 months
Contributions summary:Vinzenz contributed to the oVirt virtualization manager by implementing features related to RDP console functionality and guest OS information. They modified backend database scripts and updated the UI to display new data points such as the FQDN and guest container information. The user also addressed bugs, optimized code, and refactored the display logic for displaying session information.
defoldlibvirtovirtvirtualizationovirt-engine
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.