Jelmer De Reus
Security Specialist at Belastingdienst
Overijssel, Netherlands
Summary
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Rockstar🎓
Top SchoolJelmer De Reus is a Security Specialist with 11 years of hands-on experience bridging network engineering, incident operations and secure integrations for large enterprise environments across the Netherlands. He has progressed from NOC/SOC and network security roles into consultancy and team leadership, and now serves in security at the Belastingdienst after leading security teams at RedTeam Cyber Security. Jelmer combines practical infrastructure hardening (Linux, firewalls, enterprise integrations) with delivery-focused digital transformation experience, having built BI and ERP-adjacent tooling to improve operational forecasting. He thrives in the middle of complex projects—engaging stakeholders, shaping designs and driving delivery to high standards. An early career emphasis on audits and vendor-level troubleshooting gives him a rare mix of consulting rigor and implementation grit. Outside work he shares reusable demos and configs on GitHub, hinting at a pragmatic, reuse-minded approach to automation and tooling.
11 years of coding experience
13 years of employment as a software developer
Propedeuse International Business Management, Propedeuse International Business Management at HanzePropedeuse Law Sociology, Propedeuse Law Sociology at University of GroningenHAVO Economics and Society, HAVO Economics and Society at fivel college delfzijl
Stackoverflow
151reputation
454kreached
2answers
0questions
Github Skills (35)
transport10
java10
logging10
jruby10
streaming10
etl-framework9
logstash9
cli8
code-analysis8
polyglot8
javascript7
portal7
ruby7
high-performance7
python7
Programming languages (4)
Github contributions (5)
jelmerdereus/simple-nettools
Nov 2015 - Apr 2021
Contributions:5 pushes, 1 branch in 5 years 6 months
jelmerdereus/Cstamp
Nov 2015 - Dec 2016
Contributions:4 releases, 20 pushes, 1 branch in 1 year 1 month
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