Martin Winkel
Freelance Software Developer at Freiberuflich
Berlin, Germany
Summary
👤
Senior🎓
Top SchoolMartin Winkel is a Berlin-based freelance software developer and founder with roughly a decade of technical experience and eight years in professional roles, blending applied mathematics with pragmatic Python engineering. He has built and led product-focused teams and companies (PYTHOMATION, Lemon Tree) delivering Django/Flask services, data pipelines, and cloud-native deployments for clients like Zalando and HelloFresh. An active contributor to pandas and to Django-Oscar, he pairs hands-on test and backend improvements in widely used open-source projects with production-grade automation and BI work. Comfortable across the stack—APIs, data engineering, and infrastructure—he frequently uses Pandas, Airflow, Docker, Postgres, and AWS/GCP to turn data into reliable features. Colleagues value his combination of mathematical rigor and practical shipping instincts, and he quietly focuses on improving test stability and robustness in the projects he touches.
8 years of coding experience
7 years of employment as a software developer
Master of Science (M.Sc.), Economical Mathematics, Master of Science (M.Sc.), Economical Mathematics at Leipzig University
German, English
Stackoverflow
101reputation
7kreached
5answers
3questions
Github Skills (18)
python10
ecommerce10
django10
pandas10
osc10
django-templates10
data-analysis10
data-science9
testing9
redirect6
deserialization6
php6
internationalization6
jquery6
regex6
Programming languages (6)
Github contributions (5)
pandas-dev/pandas
Oct 2019 - Apr 2020
Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more
Role in this project:
Data Scientist
Data ScientistContributions:62 commits, 71 PRs, 284 comments in 6 months
Contributions summary:Martin's commits focus on removing `TestData` from various series tests within the pandas library, specifically in `test_operators.py`, `test_quantile.py`, `test_timeseries.py`, `test_replace.py`, `test_sorting.py`, `test_api.py`, `test_repr.py`, and `test_rank.py`. The changes involve removing or refactoring test-related data, suggesting an effort to maintain and streamline the testing infrastructure. This includes modifications to file imports and adjustments to the test logic, indicating the user is working to maintain test stability.
pythondatalabeled-datamanipulationdataframes
django-oscar/django-oscar
Aug 2021 - Feb 2022
Domain-driven e-commerce for Django
Role in this project:Back-end Developer
Back-end DeveloperContributions:3 reviews, 9 commits, 7 PRs in 6 months
Contributions summary:Martin primarily contributed to the back-end logic and template modifications of the Django-based e-commerce platform. Their work included adding a helper function for AJAX requests, streamlining link handling within email templates, and modifying templates to improve order display and translatability. Additionally, they addressed a bug related to order reporting and enhanced the application's robustness by handling edge cases in factory settings.
pythondjango-oscarecommercecommercedjango
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