Jan Michal
Senior Product Engineer at Upvest
Berlin, Germany
Summary
👤
Senior🎓
Top SchoolJan Michal is a Senior Product Engineer based in Berlin with a decade of experience turning product problems into robust engineering solutions. He blends a product-first mindset with deep backend expertise, recently advancing to a senior role at Upvest after progressive engineering positions. His open-source contributions include improving Python-to-Java transpilation in the beeware/voc project, where he implemented a sophisticated PythonFormatter to handle complex printf-style string formatting edge cases. With a background spanning computer science and philosophy, he pairs analytical rigor with clear communication and pragmatic trade-off thinking. Colleagues describe him as a troubleshooter who surfaces hidden edge cases early, reducing downstream risk. He thrives at the intersection of product clarity and low-level implementation detail, shipping reliable systems that bridge languages and platforms.
11 years of coding experience
2 years of employment as a software developer
Computer Science, Computer Science at Háskóli ÍslandsBachelor of Arts - BA, Philosophy, Bachelor of Arts - BA, Philosophy at The University of Göttingen
German, English
Github Skills (7)
javas10
string-formatting10
transcode10
string-format10
python10
transpiler10
java10
Programming languages (4)
Github contributions (5)
beeware/voc
Aug 2017 - Aug 2017
A transpiler that converts Python code into Java bytecode
Role in this project:
Back-end Developer
Back-end DeveloperContributions:6 commits, 1 PR, 3 comments in 1 day
Contributions summary:Jan contributed significantly to the `voc` project by implementing Python printf-style string formatting. This involved creating a `PythonFormatter` class with methods for handling format specifiers, flags, and precision, and integrating it into the `Str` class. They addressed edge cases and refined the formatting logic, as evidenced by refactoring the `PythonFormatter` and covering more obscure cases. These changes improved the transpiler's ability to handle string formatting, aligning with the project's goal of converting Python code into Java bytecode.
java-bytecodepythontranspiler
janmax/domjudge-cli
Apr 2016 - May 2017
Contributions:4 pushes, 1 branch in 1 year
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