Penetration Tester

Who we are and what we do

The Cyber Testing Center (CTC) is an international team of security professionals and ethical hackers who thrive on discovering how things work - and how they can be made safer. Every day we put web, mobile applications and infrastructure under the microscope, while also delivering hands-on training and workshops for our internal customers.

As cyber-threats evolve, so do we. To keep NN’s digital landscape secure, we’re searching for a mid level Penetration Tester to join our team. In this role you’ll hunt for vulnerabilities, champion secure-by-design practices across all NN countries, establish testing standards, share cutting-edge tools, and teach development teams how to build resilient applications. Hop on, grow with us, and help safeguard the digital world for millions of NN users.

What you’ll do (day to day) - no buzzwords, just the real job

• ​Perform DAST/SAST/IAST assessments against OWASP ASVS and MASVS standards to keep our apps secure.

• ​Perform infrastructure security assessments for our clients, including configuration reviews.

• ​Share your expertise: deliver workshops to app developers and infrastructure teams on security best practices.

• ​Support our clients and give them recommendations on the fixes.

• ​Make things safer with your own ideas, research, and innovative solutions.

• ​Assist with responsible disclosure program that NN Group runs.

• Build new tools and contribute to projects that expand and improve our pentesting service.

• Contribute to our internal project that includes LLM and will increase our testing coverage.

What we’re looking for

• Strong IT background and 2-5 years of experience in the penetration testing.

• ​Hands-on experience with web development (.NET, Java, Python, shell scripting, etc.), penetration testing, and system administration.

• ​Experience with penetration testing of mobile applications (iOS and Android)

• ​Experience with penetration testing of AI/LLM solutions and developing projects that use LLMs

• ​Excellent communication skills - you’re great at teaching, writing guidelines and able to explain to developers what and why needs to be fixed

• Staying up to date with the latest security trends and techniques, performing CTF labs and always working on your pentesting skills.

Why you’ll like working here

• Real Cybersecurity: You’ll break into real systems to find real weaknesses, not just pretend threats or lab simulations.

• Learn & Grow: We support your certifications (including providers like OffSec, HTB etc.), training, conferences and continuous development.

• Hybrid & Flexible: Enjoy a strong home office culture, flexible time off, and a hybrid setup - most of the time you can work from home, in the office you will be needed ad-hoc only, as we do not have mandatory office days.

• People-First Culture: Down-to-earth, open team with no unnecessary formalities (no ego, no blame, just real support).

• Modern Tools: Get a company laptop and iPhone with a fully paid plan.

• Great Benefits: Cafeteria up to 20,000 CZK, pension contributions, MultiSport card, meal allowance, discount on life insurance, contribution to HO expenses

• Care for Your Well-being: You can take advantage of the Mojra psychological counselling, Health Days every autumn, and an increased cafeteria allowance of CZK 12,000 per year for employees with disabilities.

• Referral Bonus: Get up to 60,000 CZK for referring new colleagues.

• Personalized Onboarding: During your probation, we’ll help you settle in with more in-person support

​How we hire

Our selection process is not just about talking, we'd like to gain a clear picture of your skills, experience, and way of thinking. That's why our selection process has three stages: ​

• Skills assessment: to showcase your abilities, you’ll receive a small application for pentest on which you will write a report.

• ​Technical interview: you’ll discuss your knowledge and broader expertise with the Team Lead and one of your future teammates.

• ​Final interview: you’ll meet with the Product Owner, Team Lead, and HR for the concluding conversation.