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Champion

Jan Ouwens

Yoink

Jan is a senior developer, trainer and speaker at Yoink in the Netherlands; he is interested in back-end systems, functional programming and languages. He has worked in various fields, such as banking, retail, law enforcement, transportation and electron microscopy, but he is perhaps best known for being the author of EqualsVerifier, a tool that rigourously tests Java's equals and hashCode methods in a single line.

Badges 9

Talks 6

  1. Voxxed Days Amsterdam 2025

    Fantastic languages and what to learn from them

    April 2025People & Culture

  2. Devoxx Belgium 2023

    Building a Bullsh*t Language

    October 2023Mind the Geek▶ Watch

  3. Devoxx Belgium 2022

    Don't hack the platform ☠️💣💥

    October 2022java▶ Watch

  4. Devoxx Belgium 2022

    Panel: Exploring Sustainability in Tech Without the Guilt-Trips

    October 2022People & Culture

  5. Devoxx UK 2021

    Fantastic languages and what to learn from them

    November 2021Programming languages

  6. Devoxx Belgium 2017

    Not all equals methods are created equal

    November 2017Java Language▶ Watch