Sjoerd co-started a company on multi-media authoring from 1997 to 2000. After that, he took the role of ensuring that open-source software is accessible on a wide range of platforms. He oversees the quality of the MonetDB releases and provides for hardcore consultancy on its elaborate code base.
Sjoerd was a senior software engineer at CWI from 1987 to 2019. He was one of the first developers of Python.