MARNIX LEIJDER

Information Security Management Student

Marnix Leijder
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Cybersecurity enthusiast & social engineering specialist
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The Hague, The Netherlands
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4th year ISM student @ The Hague University of Applied Sciences
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./about_me

I'm a -year-old Information Security professional specializing in the intersection of technical infrastructure, offensive security, and human-centric defense. Currently, I am in my 4th and final year at The Hague University of Applied Sciences, where I leverage my practical experience from my part-time IT job at Schalke IT and specialized internships to address complex security challenges.

My approach to security combines technical skills with business knowledge, enabling me to effectively address both technical and business challenges. I perform well both in a team environment and when working independently.

./experience

Junior System Administrator

Schalke IT Network Services

May 2023 - Present

  • Windows Server & Active Directory
  • Hyper-V Virtualization
  • Microsoft 365 (Exchange & User Management)
  • Network Management & Troubleshooting
  • IT Support & Customer Service

Information Security - Penetration Testing

aXite Security Tools

Feb 2025 - Jul 2025

Executed security assessments and penetration tests on web applications and infrastructure.

  • Pentesting
  • Web Application Security
  • Vulnerability Assessment
  • SQL Injection
  • Database Security
  • Risk Mitigation
  • Report Writing

Business Continuity Specialist

DIVD Dutch Institute for Vulnerability Disclosure

Jan 2024 - Feb 2024

Internship focused on Business Continuity Management

Frontend WordPress Developer

Wizzbit

Oct 2021 - Apr 2022

  • WordPress
  • Avada
  • Frontend Development
  • HTML/CSS
  • PHP

./skill_set

Security & Compliance

  • Penetration Testing (Burp Suite)
  • Vulnerability Assessment
  • Ethical Hacking (CTF)
  • Social Engineering (Phishing | OSINT | Pretexting)
  • Risk Management

Technical

  • Windows Server & Active Directory
  • Linux (Kali | Ubuntu | RHEL)
  • Microsoft 365
  • Virtualization (Hyper-V)
  • Network Management

Web Development

  • HTML5 & CSS3
  • PHP & MySQL
  • WordPress (Avada | Elementor)
  • Frontend & Backend Development

./education

Bachelor's Degree

Information Security Management

The Hague University of Applied Sciences

2022 - Present

MBO 4

Application Developer

ROC Mondriaan

2019 - 2022

./contact_me