Mario Jiménez
Technical Product Manager DevX (Developer Experience) at Bloomberg
San Sebastián de los Reyes, Community of Madrid, Spain
Summary
🤩
Rockstar🎓
Top SchoolMario Jiménez is a technical product manager and engineering leader with 11 years of experience shaping language and developer ecosystems at Bloomberg, where he now leads Language Repository Ecosystems and previously ran R&D Python Infrastructure. He combines deep hands-on expertise in Python, C++, and test automation with product-led roadmapping to optimize packaging, security, observability, and supply-chain workflows for corporate-scale language platforms. An active open-source contributor and Python community organizer (former Python-Spain VP and PyCon chair), he has contributed to core projects like CPython’s unittest.mock and the widely used dateutil library, improving API behavior, tests, and standards compliance. His background in high-availability systems at Amadeus and low-level interpreter packaging at Bloomberg gives him a rare blend of systems thinking and developer ergonomics. Colleagues know him for translating complex engineering constraints into pragmatic product decisions and for navigating cross-functional technical stakeholders from CTO to CISO. He’s equally comfortable authoring PEP documentation as he is leading distributed teams to ship production-grade language tooling.
12 years of coding experience
11 years of employment as a software developer
MSc Avanced Computer System Development, Computing, MSc Avanced Computer System Development, Computing at University of the West of ScotlandIngeniería Informática, Software Engineering, Ingeniería Informática, Software Engineering at Universidad de Extremadura
English, Spanish, French
Github Skills (17)
unit-testing10
datetime10
lib10
python10
testing10
datetimes10
pep10
mocking10
unit-test10
documentation10
test-automation10
restructuredtext9
rs9
parsing9
text-parsing9
Programming languages (13)
Github contributions (5)
dateutil/dateutil
Nov 2017 - Apr 2022
Useful extensions to the standard Python datetime features
Role in this project:
Back-end Developer & QA Engineer/Test Automation Engineer
Back-end Developer & QA Engineer/Test Automation EngineerContributions:1 release, 37 reviews, 40 commits in 4 years 6 months
Contributions summary:Mario primarily focused on improving the `dateutil` library's functionality and adherence to standards. They contributed by defining the public API and updating links and references to the iCalendar RFC specifications. A significant portion of their work involved writing and modifying tests, ensuring the library's reliability and correctness by addressing issues like platform support and inconsistent date/time formatting. Additionally, the user made enhancements to the build process by moving to `python-build` and transitioning the project to a `src` layout.
python-datetimepythondatetimeparsing
python/cpython
May 2017 - Sep 2023
The Python programming language
Role in this project:Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:25 reviews, 30 PRs, 216 comments in 6 years 4 months
Contributions summary:Mario primarily contributed to the `unittest.mock` module within the Python standard library, adding functionality to enhance testing capabilities. They implemented a new feature for sealing mocks, preventing the automatic creation of new attributes on sealed mocks, which improves control and reduces potential issues during testing. Their work included adding test cases and updating documentation for the new features. Furthermore, the user addressed several bugs and improved the behavior of the module.
programming-languagepython
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