Penetration Tester

You’ll be part of a team that focuses on vulnerability testing, hunting, disclosure processes, and security monitoring. You won’t just run tests, you’ll help raise the bar for security across the organization. As an experienced security tester, you play a critical role in keeping systems safe. You find vulnerabilities before attackers do. You perform penetration tests, review code, and work closely with development teams to help them fix issues and build more secure software.

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Image of Willem Heutink

We’re not just looking for someone who can break things. We want someone who knows why they break, how to fix them, and how to make sure they stay secure. If you love thinking like an attacker but collaborating like a teammate, read on!

— Willem Heutink

Solliciteer

Wat ga je doen?

  • Perform security tests and penetration testing on web and mobile applications
  • Review source code (.NET, Java, React, AngularJS) for security flaws
  • Test mobile apps (iOS, Android)
  • Use DAST, SAST, and code scanning tools
  • Assess infrastructure (Azure, AWS, Linux, Windows)
  • Report vulnerabilities clearly and advise on fixes
  • Collaborate with dev teams in an Agile environment

Wie ben jij?

You are someone who doesn’t just work with precision, you think ahead. You know that security is more than just testing for vulnerabilities; it’s about trust, responsibility, and protecting real people behind the systems. That’s why you make sure everything is airtight, down to the smallest detail. At the same time, you care about your own growth. You’re not just looking for your next assignment , you’re looking for a place where you can learn, make impact, and do work that truly matters.


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Ontwikkel jezelf met Live your potential

Wij geloven dat persoonlijke groei en balans de sleutel zijn tot blijvend succes. Daarom krijg je bij Kayak toegang tot Live your potential: ons persoonlijke ontwikkelingsprogramma dat jou helpt om niet alleen als professional, maar ook als mens te groeien.

Samen met je Field Manager en professionele coaches werk je aan thema’s als veerkracht, leiderschap, zelfinzicht en ontwikkeling. Daarnaast krijg je een persoonlijk opleidingsbudget om je ontwikkeling verder vorm te geven. Zo helpen wij jou het beste uit jezelf te halen!

Wat wij bieden:

  • A 7-month contract — Full-time (40 hours per week
  • Hybrid working — Work from home and on-site, depending on what works best for you and the team.
  • International environment — You’ll join one of the largest banks in the Netherlands, with a diverse, global team.
  • Meaningful impact — Your work directly contributes to securing services used by millions.

Wat wij vragen:

  • Hands-on experience in application and infrastructure security
  • Strong knowledge of secure coding and vulnerability assessment
  • Experience with tools like Burp Suite, OWASP ZAP, static/dynamic analysis tools
  • Familiar with secure software development lifecycle (SSDLC)
  • OSCP or equivalent certification is a plus
  • Comfortable communicating in English (Dutch is a plus)
  • A security mindset: curious, analytical, proactive, creative, and cooperative


Image of Willem Heutink

We denken graag met je mee. Of je nu hulp nodig hebt bij het vinden van een passende vacature of gewoon even wil overleggen, neem gerust contact met ons op.

w.heutink@wearekayak.com

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We vertellen je graag meer over hoe we bij Kayak werken en hoe we jou of jouw organisatie verder kunnen helpen.

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