Lumír Balhar
Principal Software Engineer at Red Hat
Frýdek-Místek, Moravia-Silesia, Czechia
Summary
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Rockstar🎓
Top SchoolLumír Balhar is a Principal Software Engineer with 11 years of professional experience and a strong focus on Python, containerization, and backend systems at Red Hat. He has driven compatibility and testing improvements across high-profile open-source projects including CPython, IPython, Fedora's Bodhi, and the s2i-python-container used for OpenShift deployments. Comfortable moving between DevOps, test automation, and core language contributions, he has implemented features like .pyc hardlinking and modernized projects for Python 3 while maintaining robust CI/testing infrastructure. Based in Frýdek-Místek, he also organizes Python meetups and conferences in the Czech Republic, connecting the local community to upstream projects. His background in HPC operations and Linux systems administration gives him a pragmatically systems-oriented perspective that complements his developer-first approach. Colleagues rely on him for thoughtful refactors that reduce technical debt and keep large open-source ecosystems current.
11 years of coding experience
17 years of employment as a software developer
Doctor of Philosophy (Ph.D.), Informatics, Not finished, Doctor of Philosophy (Ph.D.), Informatics, Not finished at Technical University of OstravaMaster's degree, Information and Communication Technology, Master's degree, Information and Communication Technology at Vysoká škola báňská - Technická univerzita OstravaGraduation, Electrical Engineering, Graduation, Electrical Engineering at Střední průmyslová škola elektrotechniky a informatiky, Kratochvílova 7, Ostrava 70200
Stackoverflow
91reputation
3kreached
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Github Skills (35)
container10
docker10
fedora10
pytest10
python10
pipenv10
testing10
git-repository10
ipython10
dockers10
s2i10
repo-management10
dockerfile10
management10
repository-pattern10
Programming languages (19)
Github contributions (5)
sclorg/s2i-python-container
Feb 2019 - Dec 2022
Python container images based on Red Hat Software Collections and intended for OpenShift and general usage, that provide a platform for building and running Python applications. Users can choose between Red Hat Enterprise Linux, Fedora, and CentOS based images.
Role in this project:
DevOps Engineer & Backend Developer
DevOps Engineer & Backend DeveloperContributions:134 reviews, 272 commits, 275 PRs in 3 years 10 months
Contributions summary:Lumír primarily contributed to the project by implementing and maintaining infrastructure configurations for the Python container images. Their work included setting up testing frameworks, integrating new Python versions (3.7, 3.8, 3.9, 3.10, and 3.11), and ensuring compatibility with different package managers like pipenv, micropipenv, and poetry. Additionally, they refactored and updated the testing process. The user also made changes to Django configurations within example applications.
pythondocker-imagered-hatopenshifthat
fedora-infra/bodhi
Oct 2017 - May 2018
Bodhi is a web-system that facilitates the process of publishing updates for a Fedora-based software distribution.
Role in this project:Back-end Developer
Back-end DeveloperContributions:77 commits, 9 PRs, 50 comments in 6 months
Contributions summary:Lumír primarily focused on improving the Bodhi web system, specifically addressing dependencies, improving code maintainability, and Python 3 compatibility. Their contributions included removing dependencies on deprecated libraries such as Bunch and webhelpers, replacing them with more modern alternatives like collections.namedtuple and feedgen. Additionally, the user made code adjustments to handle dictionaries, views, iterators, and strings in a Python 3 compatible way. They also worked on other minor enhancements such as removing and fixing imports.
distributionpublishingpythonrpmsoftware-distribution
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