Senior Penetration Tester

October 16, 2026

Office

Senior

The Hague, Netherlands

Indeed

Keep in mind

Security clearance required
Office-only work

Description

A cybersecurity services provider supporting NATO, UN, EU and national government and defence clients is hiring a Senior Penetration Tester for the Assistance and Advisory Service programme with the NATO Communications and Information Agency. The role covers web application, infrastructure and application-level penetration testing, security design reviews and cybersecurity consultancy during NATO military exercises. The successful candidate will assess vulnerabilities across operating systems, software, protocols and networks and communicate findings and remediation plans to technical teams, executives and military leadership.

Responsibilities

Lead or participate in Red Team and Blue Team activities during NATO military exercises
Conduct web application, infrastructure and application-level penetration testing
Perform security design reviews to ensure compliance with NATO security policies and directives
Provide cybersecurity consultancy and technical advice to projects and other stakeholders
Identify and assess security vulnerabilities in operating systems, software, protocols and networks
Evaluate security risks and develop mitigation recommendations
Research and evaluate security products and technologies
Prepare structured penetration testing reports including executive summaries, technical findings and remediation plans
Present security assessment results to technical teams, executives and senior military leadership including flag officers
Collaborate with the NCIA Configuration Control Board, Security Accreditation Boards and NATO Security Accreditation Authorities
Coordinate with the Head of the Penetration Testing Cell and internal and external stakeholders

Requirements

Web application penetration testing
IT infrastructure penetration testing
Network security architecture and design
Vulnerability assessment of operating systems, applications, protocols and networks
Penetration testing tools, techniques and recognised testing methodologies
UNIX and Windows system and network administration
Scripting in at least one of Python, Perl, Ruby or Shell scripting (Bash, Ksh or Csh)
System and network security
Authentication and security protocols
Cryptography and application security
Malware infection techniques and protection technologies
Security product and technology evaluation
Risk assessment and mitigation planning
Technical report writing for executive and technical audiences
Strong communication and stakeholder management skills
More than 3 years of experience in penetration testing, network security architecture, vulnerability assessment and security technologies
Valid National or NATO Secret personal security clearance

Conditions

Full-time on-site working arrangement at The Hague, Netherlands
Start date 30 November 2026, end date 31 December 2026 with possibility of extension
Total scope of 400 hours
Normal office working conditions
Some travel to other NATO sites may be required, 10 days foreseen

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