Junior Penetration Tester

CGI Cyber Security Team in the UK is one of the largest cyber consultancies in the UK, with around 1,700 members.

The UK Cyber team works across a variety of domains including Government, Defence, Critical Infrastructure, Healthcare, Utilities, Banking, and Financial Services. At CGI, you will have the opportunity to work across multiple sectors and areas of cyber security, allowing you to grow and develop your career.

CGI was recognised in the Sunday Times Best Places to Work List 2025 and has been named one of the ‘World’s Best Employers’ by Forbes magazine.

We offer a competitive salary, excellent pension, private healthcare, plus a share scheme (3.5% + 3.5% matching), which makes you a CGI Partner, not just an employee.

We are committed to inclusivity, building a genuinely diverse community of tech talent and inspiring everyone to pursue careers in our sector, including our Armed Forces. We are also proud to hold a Gold Award in recognition of our support of the Armed Forces Corporate Covenant.

Join us and you’ll be part of an open, friendly community of experts. We’ll train and support you in taking your career wherever you want it to go.

This is a strong opportunity for a Junior Penetration Tester to work alongside and learn from experienced penetration testers (including CHECK Team Members and CHECK Team Leaders) within CGI’s Cyber Security business unit—one of the largest groups of cyber security specialists in the UK.

CGI has a long-established reputation in this area, delivering rigorous testing for a wide range of commercial and public sector clients for over 30 years.

Due to the secure nature of the programme, you will need to hold UK Security Clearance or be eligible to obtain it.

Your future duties and responsibilities

• Deliver end-to-end penetration testing engagements across web applications and infrastructure, from scoping through to reporting and client aftercare
• Participate in client interactions, including scoping discussions, requirements gathering, and contributions to proposals and statements of work
• Conduct penetration tests using structured methodologies and industry-recognised approaches
• Work collaboratively as part of a team, sharing knowledge and improving overall assessment quality
• Produce high-quality technical reports, including detailed findings and executive summaries aligned to internal standards
• Engage with internal QA processes to ensure report accuracy and continuous improvement
• Maintain strong communication throughout engagements, including client updates, progress calls, and formal debriefs

Required qualifications to be successful in this role

Essential:

• Hack The Box Certified Penetration Testing Specialist (CPTS) or OffSec Certified Professional (OSCP)
• Commitment to working towards NCSC CHECK Team Member (CTM) status

Desirable:

• CREST Practitioner Security Analyst (CPSA)
• CREST Registered Penetration Tester (CRT)
• Cyber Scheme Team Member (CSTM)
• Certified Red Team Operator (CRTO)
• Practitioner Cyber Security Professional (PraCSP)
• Previous penetration testing experience is advantageous but not mandatory (training and mentoring provided)

Together, as owners, let’s turn meaningful insights into action. Life at CGI is rooted in ownership, teamwork, respect and belonging. Here, you’ll reach your full potential because… You are invited to be an owner from day 1 as we work together to bring our Dream to life. That’s why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our company’s strategy and direction. Your work creates value. You’ll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas, embrace new opportunities, and benefit from expansive industry and technology expertise. You’ll shape your career by joining a company built to grow and last. You’ll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons. Come join our team—one of the largest IT and business consulting services firms in the world.