Yan Yanchii
Senior Software Engineer at Kiwi.com
Brno, South Moravia, Czechia
Summary
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Rockstar🎓
Top SchoolYan Yanchii is a Senior Software Engineer based in Brno with seven years of experience building search engines, map-data processing pipelines, and recommendation systems at companies like Kiwi.com, HERE Technologies, and Cell Signaling Technology. He contributes to major open-source projects including CPython, where he has focused on bug fixes, performance optimizations, optimizer improvements, and clearer error handling—work that touches the core of a language used by millions. A regular speaker at PyCon and EuroPython, Yan communicates deep technical ideas (e.g., pointers and asyncio internals) to broad audiences. His background in applied mechanics and mechanical engineering gives him a strong analytical foundation that he applies to systems-level problems and performance tuning. Colleagues know him as a pragmatic engineer who pairs hands-on coding with thoughtful design to squeeze efficiency out of complex systems.
7 years of coding experience
6 years of employment as a software developer
Master's degree, Applied Mechanics, Master's degree, Applied Mechanics at Technická univerzita v Košiciach
English, Russian, Ukrainian, Slovak, Czech
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (8)
c1710
c1110
python10
error-handling9
compiler-optimization9
debug8
debugging8
bytecode8
Programming languages (1)
Github contributions (5)
python/cpython
Nov 2022 - Mar 2025
The Python programming language
Role in this project:
Back-end Developer
Back-end DeveloperContributions:214 reviews, 49 PRs, 381 comments in 2 years 4 months
Contributions summary:Yan primarily contributed to the Python codebase, focusing on bug fixes, performance optimizations, and code improvements. They removed redundant conditions in the `take_gil` function, improved error messages and documentation for the `super` function, and added error checks for usages of `PyIter_Next()`. The user also added functionality to the optimizer, and refactored code to improve efficiency.
python-programmingprogramming-languagepythonpython-programming-language
WolframAlph/cpython
Nov 2022 - Mar 2025
The Python programming language
Contributions:13 reviews, 1 PR, 225 pushes in 2 years 4 months
python-programmingpythonmojoprogramming-languagepython-programming-language
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