Penetration Tester

As a Penetration Tester within the internal cybersecurity team, you’ll play a key role in identifying and mitigating security risks across the organisation’s digital landscape. This position requires hands-on experience in offensive security and a deep understanding of network, application, and cloud-based vulnerabilities.

You’ll be responsible for conducting thorough penetration tests, simulating real-world attacks, and delivering actionable insights to both security and development teams. Collaboration and continuous learning are central to the role, ensuring our defences stay ahead of emerging threats.

Please note this is a hybrid role, with a compulsory attendance of 2 days a week in the London office.

What will I be doing:

• Performing penetration tests on web applications, networks, APIs, mobile apps, and cloud environments,
• Simulating real-world attack scenarios to assess system and infrastructure resilience,
• Producing detailed technical reports and executive summaries for stakeholders,
• Collaborating with internal teams to validate findings and support remediation efforts,
• Staying up to date with emerging threats, vulnerabilities, and offensive security techniques.

To succeed in this role, you’ll need a solid background in penetration testing or offensive security, along with hands-on experience using industry-standard tools and frameworks. A strong grasp of security principles and methodologies is essential, as is the ability to communicate findings clearly and effectively. Other qualifications and skills include:

• Proficiency with tools like Burp Suite, Nmap, Metasploit, Nessus, and Kali Linux, plus scripting skills in Python, Bash, or PowerShell,
• Strong understanding of OWASP Top 10, MITRE ATT&CK, CVSS scoring, and familiarity with cloud platforms (AWS, Azure, GCP) and container security,
• Relevant certifications such as OSCP, CREST CRT, or eCPPT are highly desirable, along with excellent written and verbal communication skills,
• The ability to mentor junior testers and contribute to internal tooling.

• 23 days’ holiday + all public holidays, rising to 25 days after 2 years of service,
• Additional day off for your birthday,
• Private medical insurance which covers you, your cohabiting partner and children,
• Life insurance of 4 times your base salary,
• Salary sacrifice pension scheme,
• Enhanced family leave,
• Confidential Employee Assistance Program,
• Cycle to work scheme.

Darktrace is a global leader in AI-driven cybersecurity, helping organizations stay ahead of evolving threats every day.

Darktrace was built on a genuinely differentiated idea: that Adaptive AI could detect and respond to novel, real-time cyber threats. That approach matters more than ever in the era of AI. Today, our customers depend on us to stay ahead.

At Darktrace, we are energized by that responsibility. We work across teams and rally around a shared goal. We own outcomes end to end - step in, step up and see things through without waiting to be asked. We make decisions with urgency, say the hard thing, and hold each other to high standards with care and directness. We move first and learn fast anticipating where our customers are going next, continuously challenging ourselves.

We invest in the skills, learning and opportunities that help people deliver at the level their roles demand, and reward the aptitude and curiosity to grow beyond them.