Claudio Jolowicz
Engineering Manager at Cloudflare
Berlin, Germany
Summary
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Rockstar🎓
Top SchoolClaudio Jolowicz is an engineering manager at Cloudflare with 15 years of experience building high-performance backend systems, CI/CD pipelines, and developer tooling. He authored O'Reilly's Hypermodern Python Tooling and maintains the widely used cookiecutter-hypermodern-python project, driving automation around testing, releases, and dependency management. His background spans low-level C++ systems that processed hundreds of millions of emails monthly to modern Python test automation and type-safety improvements for projects like Hypothesis and nox. Claudio blends hands-on engineering (from monorepo migrations and build-system rewrites to production C++ networking) with people leadership and mentoring across teams. Based in Berlin, he pairs formal training in computing and law with an unusual creative past as a touring multi-instrumentalist, bringing disciplined curiosity and cross-disciplinary problem-solving to software delivery.
15 years of coding experience
18 years of employment as a software developer
1st State Examination in Law, Distinction (11.06), 1st State Examination in Law, Distinction (11.06) at University of HamburgMaster’s Degree, Computing Science, Distinction, Master’s Degree, Computing Science, Distinction at Imperial College London
English, German, French, Italian, Polish, Portuguese
Stackoverflow
3,458reputation
440kreached
7answers
10questions
docker
top-5%
dockerfile
top-5%
python
top-5%
Github Skills (32)
property-based-testing10
github-ci10
pytest10
python10
testing10
mypy10
poet10
cicd10
release-management10
automation10
code-coverage10
automations10
githubaction-workflow10
poe10
nox10
Programming languages (16)
Github contributions (5)
cjolowicz/cookiecutter-hypermodern-python
Feb 2020 - Jun 2022
Hypermodern Python Cookiecutter
Role in this project:
Backend & DevOps Engineer
Backend & DevOps EngineerContributions:57 reviews, 691 commits, 1460 PRs in 2 years 4 months
Contributions summary:Claudio primarily contributed to automating and maintaining the project's build and release processes. They focused on configuring and improving the Continuous Integration and Continuous Delivery (CI/CD) pipeline using GitHub Actions, including setting up workflows for testing, code coverage, and documentation builds. The user also worked on dependency management and utilized nox-poetry to manage the project's dependencies and automate tasks. Furthermore, they established tools to automate cookiecutter releases, handling the release process from version bumping to publishing on PyPI and GitHub.
cookiecutterpython
wntrblm/nox
Sep 2019 - Dec 2021
Flexible test automation for Python
Role in this project:QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:1 release, 204 reviews, 25 commits in 2 years 4 months
Contributions summary:Claudio primarily contributed to the test automation framework for the nox project, modifying and extending the testing capabilities. They added new test cases to validate the project's functionality, including comprehensive testing for command line option merging, Python version selection, and keyboard interrupt handling during command execution. These changes directly improved the robustness and reliability of the test suite, improving the software quality.
pythontest-automationtestingautomation
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