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Klaas-Jan Postma's work experience includes roles at various companies starting with their position as a Monitoring 3de lijns support at KPN from January 2005 to August 2008. Klaas-Jan then worked as an Application Manager at Mcom from August 2008 to July 2012, where they were responsible for incident management, changes, projects, and daily operations. From July 2012 to January 2014, Klaas-Jan worked as an Application Manager at Translink systems, where they specialized in Dynamics AX, Bizztalk 2010, SQL server (2008 R2), Oracle, ISA/ TMG, Security systems, and custom software based on Windows. Klaas-Jan then transitioned to the role of IT Consultant at Translink systems from January 2014 to November 2015, where they implemented a new PKI and security-related processes, as well as other technical implementations for new and existing systems. From November 2015 to August 2017, Klaas-Jan served as a Security Expert at Translink systems, where they assessed and implemented the Payment Card Industry Data Security Standard (PCI DSS). Finally, they took on the role of Security Officer at Translink systems from August 2017 onwards, responsible for policy development and advisory on all aspects of information security (ISO 27001), as well as coordinating the PCI DSS program and focusing on business continuity.

Klaas-Jan Postma's education history is as follows:

In 2021, they obtained a certification in CISSP from an undisclosed institution.

From 2004 to 2005, Klaas-Jan attended HvU where they earned a HBO degree in Management, Economics, and Rights.

Prior to that, from 2000 to 2004, they attended ROC midden nederland where they completed an MBO degree in System Management and Application Development.