Felienne is a professor of Computer Science Education at the Vrije Universiteit Amsterdam. She also works as a high-school CS teacher one day a week at Lyceum Kralingen in the Codasium program.

Felienne is the creator of the Hedy programming language, a gradual and multi-lingual programming languages designed for teaching.

She is the author of “The Programmer’s Brain“, a book that helps programmers understand how their brain works and how to use it more effectively. In 2021, Felienne was awarded the Dutch Prize for ICT research. She also has a biweekly tech column on BNR, a Dutch radio station.