Senior Penetration Tester

Location: UK - Mobile England | Job-ID: 215877 | Contract type: Standard | Business Unit: Cyber Security

Life on the team

Computacenter is growing our penetration testing capability, and we are looking for an experienced Senior Penetration Tester to support the delivery of vulnerability assessment and penetration testing services to Computacenter and our customers delivered services.

As a highly skilled and motivated Penetration Tester, you will join our dynamic Cybersecurity team. In this role, you will be responsible for identifying vulnerabilities in systems, applications, and networks through a variety of penetration testing methodologies. Your expertise will play a critical role in strengthening our security posture and safeguarding our valuable assets from cyber threats.

We are keen to develop our own people and will look at individuals; you will be involved in many business projects whilst working with passionate Cyber Security Professionals.

As a proud signatory to the Armed Forces Covenant, we value the skills, discipline, and leadership that veterans bring to the workplace. That’s why we offer a wide range of exciting opportunities for you to start your next mission with us.

At Computacenter, you’ll find a work environment like no other. We thrive on a can-do culture where people truly matter. Your experience and adaptability will help us continue our journey to support customers in changing the world. Here, you’ll be part of a team that values collaboration, innovation, and making a real impact.

If you are looking for a team that offers development and flexibility look no further and apply today

What you'll do

We need a highly skilled and motivated Penetration Tester to join our dynamic cybersecurity team. In this role, you will be responsible for identifying vulnerabilities in our systems, applications, and networks through various penetration testing methodologies, advanced threat simulation and emulation. You will play a critical role in strengthening our security posture and protecting our valuable assets from cyber threats. You will:

• Conduct comprehensive penetration tests: Execute internal and external network penetration tests, web application penetration tests, mobile application penetration tests, API penetration tests, cloud security assessments, and social engineering simulations.

• Vulnerability identification and analysis: Research, identify, and exploit security vulnerabilities in a variety of systems and applications.

• Red/Purple/Blue Teaming: participate in exercises with the goal of increasing cyber resilience for both offensive and defensive as well as developing our overall capabilities.

• Reporting and documentation: Prepare detailed and professional penetration test reports, including executive summaries, technical findings, risk ratings, and actionable recommendations for remediation.

• Collaboration and communication: Work closely with development, operations, and security teams to communicate findings, explain risks, and provide guidance on remediation strategies.

• Tooling and methodology enhancement: Continuously research and evaluate new penetration testing tools, techniques, and methodologies to improve testing efficiency and effectiveness.

• Security awareness: Contribute to the development and delivery of security awareness training for internal staff.

• Stay current: Keep abreast of the latest security threats, vulnerabilities, exploits, and industry best practices.

• Threat modelling: Participate in threat modelling exercises to identify potential attack vectors and design flaws.

• Ad-hoc security testing: Perform ad-hoc security assessments and provide expert advice on security-related matters as needed.

What you'll need

• OSEP, CRTO, SANS GRTP, SANS GXPEN, CSTL or equivalent certification
• At least five years’ experience working full-time as a penetration tester, with exposure to Red Team operations, on the following areas as a minimum:
  • Infrastructure
  • Active Directory networks
  • Web Application penetration testing
  • Network device reviews
  • Cloud security (Entra ID/Azure)
  • Red Team / Purple team operational experience (Including Physical Security and Social Engineering)
  • [optional] IoT
  • [optional] mobile
• Ability to develop custom tools, or adapt existing tooling for the task at hand
• [optional] Public blogs, research or talks
• [optional] Demonstrable experience contributing to open-source tools
• [optional] Coding proficiency in any major languages

About us

Computacenter is a leading independent provider of IT infrastructure services, with about 20,000 employees worldwide. We work at the heart of digitisation, advising organisations on IT strategy, implementing the most appropriate technology and managing our customers’ infrastructures.

We offer a friendly, open working environment without too much fuss about hierarchy. We are looking for professionals with diverse competencies, personalities and strengths who want to live our shared value of teamwork and performance.

Interested in joining a company with a strong sense of community?

We’re growing. We’re hiring. We encourage. We empower. We support.
#winningtogether #peoplematter