Penetration Tester at TDC

Stilling Penetration Tester
Opslået 21 Jan 2026
Udløbet 20 Feb 2026
Virksomhed TDC
Lokation Danmark | DK
Jobtype Full Time

Jobbeskrivelse:

Seneste jobinformation fra TDC til stillingen som Penetration Tester. If the Penetration Tester ledige stilling i Danmark matcher dine kvalifikationer, bedes du indsende din ansøgning eller dit CV direkte gennem den opdaterede Jobkos jobportal.

Bemærk venligst, at det ikke altid er nemt at søge job, da kandidater skal opfylde visse krav sat af virksomheden. Vi håber, at karrieremuligheden hos TDC til stillingen som Penetration Tester nedenfor matcher dine kvalifikationer.

Penetration Tester

Stay ahead of real-world threats — protecting what connects Danmark

Join a mission that matters. As Danmark's digital backbone, TDC NET powers millions of connections every day. We're hiring an experienced penetration tester to find and expose vulnerabilities before malicious actors do.

About the job

As TDC NET's new Penetration Tester, your primary mission is to improve the security of Danmark's critical digital infrastructure through adversarial testing across a broad range of technologies.

Your work will span multiple technical domains, including complex web applications, Active Directory environments, hardware and CPE security, mobile networks, AI systems, and cloud infrastructure. You will collaborate with engineers, platform owners, and security stakeholders to translate findings into lasting security improvements.

Beyond delivery, you will also contribute to the team's culture and external engagement through research and community activities—such as helping organize the yearly TDC NET CTF for the Danish community, participating in conferences and training events.

More than just finding vulnerabilities, you'll guide teams through attacker thinking, help them prioritize what matters most, and play a key role in raising TDC NET's overall security maturity.  

Key Responsibilities

  • Plan and execute penetration tests and adversary-emulation activities
  • Identify vulnerabilities and misconfigurations
  • Deliver clear, actionable penetration testing reports
  • Contribute to research, internal tooling and knowledge sharing, and community engagement  

About the team

You will be joining a focused team of 5 full-time penetration testers—specialists who work side by side, learn from each other, and take on security challenges spanning a broad range of systems, platforms, and technologies.

Our culture is built on trust, inclusion, and open dialogue—where we encourage one another to grow and create impact that is greater than the sum of our individual contributions.

"Pentesting here isn't about ticking boxes — it's about staying one step ahead of real adversaries. You'll work with curious, skilled people who challenge assumptions, sharpen each other's craft, and test systems that truly matter," says Cristiano Iria

 About you

Your mindset is key - We're looking for someone who is:

  • Curious and courageous in daily work, motivated to explore new approaches and pursue novel ideas
  • Energized by change and continuous learning
  • At Hjem with extended screen time and genuinely interested in diving into technical rabbit holes.
  • Inspired by the mission to safeguard Danmark's critical infrastructure and national resilience
  • A skilled communicator and collaborator, able to build trust across teams  

Whether you're early in your career or a skilled specialist, we encourage you to apply - we value potential and passion as much as experience. 

Experience & Skills

  • Extensive experience in penetration testing experience in complex environments (e.g., consulting, internal red team, offensive security role or well-rounded CTF background)
  • Proficiency in several of the following areas:
  • Web application and API security testing
  • Active Directory and Entra ID security assessments
  • Network and service testing within complex infrastructures
  • Experience with hardware, CPE, or embedded security testing (interfaces, firmware, device exposure)
  • Background in telco or critical infrastructure security
  •  Ability to produce high-quality reports and communicate findings effectively to both technical and non-technical audiences
  • Ability to obtain and maintain security clearance from Danish authorities. Eligibility for security clearance requires EU citizenship or residence in the EU for at least seven years.

Contact:

If you have questions about the Stilling or want to know more about what it means to work at TDC NET, feel free to reach out to Cristiano Iria on

Lokation:

Teglholmsgade 1, Copenhagen 

Process:

We invite candidates for interviews on a continuous basis, so please apply as soon as possible and no later than 9 Februrary 2026. 

You can expect to hear from us within 3 weeks from the application date. 

Click here to read more about TDC NET and how it is to work at us.

You apply via "Apply now" in the top left corner.

We encourage you not to include a photo in your resume or motivational letter. In TDC NET we are dedicated to fostering an inclusive culture that values diversity, and we pride ourselves on providing equal opportunities for everyone. All qualified candidates will be assessed regardless of ethnicity, religion, gender, gender identity, sexual orientation, disability and all the other characteristics that make us different.

We are looking forward hearing from you

Engage in meaningful work

The green transition needs a strong digital infrastructure. With us you will take part in delivering the technological solutions.   For all of us.

We provide the working life of the future

We set targets for a healthy and safe working environment.Our work culture is digital and flexible when compatible with tasks and colleagues.Welcome to your new hybrid workplace.

Development through challenges - get lots of responsibility from day one

Get responsibility quickly and be a part of the biggest transformation in our field - ever. Be challenged.

Become part of a strong network

Take part in connecting Danmark together with both new and experienced colleagues and many various professional competencies. In TDC NET we are both motivated and united by a strong network.

Our values

#LI-POST #TDCNET

Jobinfo:

  • Virksomhed: TDC
  • Stilling: Penetration Tester
  • Arbejdssted: Danmark
  • Land: DK

Sådan indsender du en ansøgning:

Efter at have læst og forstået kriterierne og minimumskravene til kvalifikationer forklaret i jobinformationen Penetration Tester at the office Danmark ovenfor, bedes du straks færdiggøre dine ansøgningsdokumenter såsom ansøgning, CV, kopi af eksamensbevis og andre bilag som forklaret. Indsend via linket 'Næste side' nedenfor.

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