Felix Zumstein
Lucerne, Lucerne, Switzerland
Summary
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RockstarFelix Zumstein is the creator of xlwings and a seasoned software entrepreneur with 13 years of experience helping finance and enterprise teams bridge Excel and Python. He builds open-core, audit-friendly tooling—ranging from Python UDFs and REST APIs to Git-enabled collaboration and automated testing—that keeps mission-critical spreadsheets production-ready without forcing migration. An O’Reilly author and LinkedIn instructor who runs xlwings meetups in London and NYC, he combines community education with product-led open-source development. Based in Lucerne, Switzerland, he’s known for practical, developer-friendly integrations (xltrail, Git XL) that make version control and CI work for business users as well as engineers.
13 years of coding experience
Stackoverflow
6,980reputation
610kreached
227answers
5questions
pandas
top-5%
vba
top-5%
excel
top-1%
python
top-5%
Github Skills (192)
pywin3210
python10
windows10
vnc-client10
google-sheets10
automation10
cloud-object-storage10
excel10
k8s10
xlwings10
pandas10
csv10
git-diff10
xlsx10
json10
Programming languages (12)
Github contributions (5)
xlwings/xlwings-officejs-quickstart
Jan 2023 - Sep 2024
Contributions:6 PRs, 50 pushes, 9 branches in 1 year 8 months
xlwings/xlwings-eikon
Oct 2019 - Jan 2021
Demo: xlwings and Refinitiv Eikon
Contributions:39 commits, 36 pushes, 4 branches in 1 year 3 months
xlwingsrefinitiv
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