John Zwinck
Software Engineering Manager at DRW
Amsterdam, North Holland, Netherlands
Summary
👤
Senior🎓
Top SchoolJohn Zwinck is a software engineering manager based in Amsterdam with 14 years of experience building and leading teams that deliver low-latency trading systems and market infrastructure. He has led software development across global trading firms—co-creating Coinbase Exchange, heading Asia development at DRW, and building low-latency platforms and proprietary messaging at boutique trading shops. A hands-on technologist comfortable in both C++ and Python, he has contributed bug fixes and memory-alignment improvements to the widely used NumPy project, reflecting deep familiarity with high-performance scientific computing. He combines operational rigor (risk management, FIX connectivity, HDF5/NumPy research tools) with a track record of shipping production systems quickly, including taking projects from inception to live trading in months. Known for blending commercial and open-source technologies, he pairs technical leadership with recruiting and cross-regional delivery experience.
14 years of coding experience
19 years of employment as a software developer
B.S.E., Computer Engineering, B.S.E., Computer Engineering at University of Michigan
English, Spanish, c++, javascript, python, lua, c, bash
Stackoverflow
244,444reputation
20.3mreached
5,525answers
125questions
pandas
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Github Skills (116)
opencv10
python10
multithreading10
authentication10
bash10
cmake10
lua10
sed10
conditional-statements10
unix10
pandas10
linux10
numpy10
stream10
socket10
Programming languages (8)
Github contributions (5)
numpy/numpy
Jun 2016 - Jul 2020
The fundamental package for scientific computing with Python.
Role in this project:
Backend Developer
Backend DeveloperContributions:5 commits, 9 PRs, 45 comments in 4 years 1 month
Contributions summary:John's commits primarily focused on bug fixes and enhancements within the NumPy library. They addressed issues related to data alignment during saving, specifically aligning data to 64 bytes for memory mapping compatibility. They also corrected a bug concerning the loading of empty .npz files and resolved an issue that could lead to exceptions in the NpzFile destructor. The user also contributed a documentation fix, removing an incorrect entry from a function list.
pythonscientific-computingnumpy
jzwinck/numpy
Jun 2016 - May 2020
Numpy main repository
Contributions:2 PRs, 17 pushes, 5 branches in 3 years 11 months
numpypython
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