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Koen Castelein's work experience includes being a Lead Solution Software Engineer and Cloud Engineer at PostNL since 2022. Prior to that, they worked as a Native Cloud Programmer at Levarne - Flexible Digital Products from 2021 to 2022. Koen also served as a Student Assistant at Leiden University from 2016 to 2018 and worked as a Help Desk Technician at Topaz in 2017.

Koen Castelein completed their Bachelor's degree in Computer Science at Leiden University from 2013 to 2017. Prior to that, they attended Stedelijk Gymnasium Arnhem from 2006 to 2013. In addition, Koen obtained several certifications related to Amazon Web Services, including AWS Certified Solutions Architect - Associate and AWS Certified Developer - Associate in 2023, as well as Amazon Web Services Cloud Practitioner in 2021.