Felix Claessen
CEO at SEITA energy flexibility
Amsterdam, North Holland, Netherlands
Summary
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RockstarFelix Claessen is the CEO and founder of SEITA, where he leads development of FlexMeasures, a real-time platform for forecasting and scheduling energy flexibility, applying eight years of hands-on software engineering to a fast-evolving clean energy stack. Based in Amsterdam, he combines product leadership with backend engineering chops, contributing to open-source projects like workalendar by implementing precise regional holiday calculations and rigorous test automation. His background shows a practical focus on reliability and time-aware systems—skills that translate directly to energy forecasting and scheduling. Colleagues would describe him as an entrepreneur-engineer who balances strategic vision with attention to code quality and edge-case correctness.
8 years of coding experience
Github Skills (4)
pytest10
python10
calendars9
localization9
Programming languages (7)
Github contributions (5)
workalendar/workalendar
Sep 2020 - Oct 2020
Worldwide holidays and workdays computational toolkit.
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:1 review, 15 commits, 5 PRs in 29 days
Contributions summary:Felix primarily contributed to the development of a calendar library, focusing on adding functionality for Netherlands school holidays. They implemented specific holiday calculations and regional variations, demonstrating a strong understanding of date and time manipulation. Furthermore, the user added and enhanced tests to validate the calendar's accuracy, including tests for specific years and regions, ensuring the reliability of the library. Additionally, the user addressed code style issues and improved test structure, solidifying their role in maintaining code quality.
pythoncalendarworldwideicalendarworkdays
SeitaBV/flexmeasures-zinfo
Sep 2021 - May 2023
Getting data from the Z-Info API
Contributions:4 reviews, 17 PRs, 21 pushes in 1 year 8 months
api
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