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// cybersecurity portfolio

Robbin Westerduin

IT Student

IT Support Intern @ Nedsoft B.V.

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// core competencies

Skills overview

Infrastructure

  • Virtualization 90%
  • Proxmox VE 90%

Linux

  • Linux Administration 85%

Programming

  • Python 80%

Security

  • Cybersecurity 75%
cat skills --all →

// responsible disclosure

Recent security disclosures

Critical Open

Multiple Security Vulnerabilities in Mijn Simyo App / API

CERT#2026052777000311 · Simyo / KPN

Identified and responsibly disclosed multiple critical and high severity security vulnerabilities in the Android app and API of Simyo, a KPN subsidiary. Reported via KPN-CERT responsible disclosure. Findings acknowledged and remediation in progress. Recognized on the KPN-CERT Hall of Fame.

Reported May 27, 2026

ls disclosures/ →

Let's work together

Open to security engineering roles, penetration testing engagements and coordinated disclosure conversations.

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