Sacha Telgenhof
Lead Web Developer at Springer Nature Group
Earth, Texas, Japan
Summary
🤩
Rockstar🎓
Top SchoolSacha Telgenhof is a pragmatic Lead Web Developer with 14 years of hands-on engineering experience and nearly three decades of technical leadership across real estate, finance, e-commerce, and publishing. Based in Japan (formerly Earth, Texas), he blends architectural rigor with clear communication to turn abstract requirements into maintainable, production-ready systems while mentoring teams. At Springer Nature he drives web platform delivery and previously held product and IT leadership roles at Rakuten and Prologis, giving him a rare mix of product sensibility and operational scale. He contributes to open-source PHP tooling—maintaining holiday calculation logic and localization in the yasumi library—demonstrating attention to internationalization and robust testing. Known for calm analytical problem-solving, he excels where deep technical design and people development are equally prioritized.
14 years of coding experience
16 years of employment as a software developer
MSc, Architecture, Building and Planning, MSc, Architecture, Building and Planning at Eindhoven University of TechnologyVWO, Pre-university scientific education including Ancient Greek and Latin, Gymnasium-Beta, VWO, Pre-university scientific education including Ancient Greek and Latin, Gymnasium-Beta at Pius X College
Dutch, English, German, French, Japanese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (3)
php10
unit-testing10
localization9
Programming languages (19)
Github contributions (5)
azuyalabs/yasumi
Mar 2015 - Jan 2023
The easy PHP Library for calculating holidays
Role in this project:
Back-end Developer
Back-end DeveloperContributions:18 releases, 67 reviews, 1309 commits in 7 years 10 months
Contributions summary:Sacha's primary contributions involve updating and maintaining the PHP library `azuyalabs/yasumi`, specifically focusing on enhancements related to holiday calculations. This includes the addition and modification of holiday providers for various countries and subregions, involving changes to the core logic for date calculations. The user has been implementing localization and translation support for holiday names. Additionally, the user has been adding and adjusting unit tests for the newly added holiday providers.
apicalculationsphpcalculate-holidaysphp-library
azuyalabs/waqi
Feb 2017 - Jan 2022
Simple PHP Wrapper for the World Air Quality Index API
Contributions:5 releases, 132 commits, 3 PRs in 4 years 11 months
apiwaqiapi-wrapperindexphp
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