Staedion | Stichting Staedion
March 2024 – Sept 2025
System and Network Administrator

Started in March 2024 as a system and network administrator at Staedion after the previous staff had left. Together with another new colleague, we fully mapped and documented what had until then been a largely undocumented IT-landscape. In this first year we implemented dozens of improvements and changes, enabling us to manage the environments more comfortably and allowing the organization to work more securely with them.

As a bonus, the more efficient setup, among other things by migrating unnecessarily large (virtual) environments to cloud containers, resulted in a calculated/expected annual Azure saving of €118,000.- In addition to managing Staedion’s Azure tenant, we were also responsible for two Azure Stack HCI / Azure Local hardware clusters (Hybrid Cloud). This complex environment was one of the biggest and most enjoyable challenges so far.

Including a notable recovery:
https://brain.seppjm.com/not-so-resilient-filesystem/,
security:
https://brain.seppjm.com/vertrouwen-is-goed-controleren-is-beter-nl/,
and other fun projects:
https://brain.seppjm.com/tag/m365-azure/

Amazon.com | Amazon Development Center B.V.
May 2022 – Apr 2023
Data Associate

Data Associate at Amazon Data Services, located at the Amazon development center the Hague. Besides the daily tasks expected during the work, I have delivered a lot of extra work, including: internal tools and a toolbox, 'Security concern documents,' manuals, projects, and much more.

More information about these internal projects without the sensitive details can be found here: https://cv.seppjm.com/en/weamzn2022

DiodeMatrix | ICT & Software
Jan 2018 – Present
Founder & Owner (eenmanszaak)

Skilled in all general basic tasks associated with a (one-person) business:
Small business administration; accounting, taxes, processing purchase/sales invoices, and organization.

From developing software to setting up ICT infrastructures (e.g., for the hotel mentioned below), I've always viewed it as a significant learning journey. No staff, just freelancers on contract when necessary. This involved gaining experience in server/cloud hosting, Apache/NGINX stack setups, M365, Postfix, network equipment from Ubiquiti and Microtik, etc.
Due to cost-saving measures in 2020-2021, transitioned from multiple servers (postfix-mail, CALDAV, Workspace, etc.) to a single internal Microsoft 365 solution alongside the in-house DiodeMatrix cloud (diomtec.com) (instead of e.x Azure).

Zorn Hotel Duinlust | Hotel
Apr 2016 – Aug 2021
Allround employee

Become proficient in nearly all daily tasks associated with a medium/small-sized hotel.

Pre-career work & Experiences
> – 2014
"Snuffel"

Before high school, I hang around at Selectron ICT & Maptec ICT, where I learned a lot about ICT at a young age. I also earned some money by repairing equipment.

During my high school years, I let these activities fade away...