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4Square Recruitment Ltd • London, England, United Kingdom
Salary: GBP 40,000–60,000 per year
Role & seniority: Penetration Tester / Red Team Consultant, 1–3 years experience; reports to Senior Penetration Tester. Remote-first, occasional client visits.
Stack/tools: Offensive security; OSCP certification; expertise in OS, networks, and application security; offensive tooling (exploitation, AD attacks, recon); strong documentation/reporting.
Deliver red team, purple team, and broader offensive security engagements.
Conduct attack simulations, threat modeling, targeted technical testing; produce high-quality penetration testing and red team reports.
Communicate findings to technical and non-technical stakeholders; contribute to service/methodology development and ongoing R&D.
1–3 years in penetration testing, red teaming, or offensive security
OSCP certification
Strong understanding of operating systems, networks, and application security
Practical offensive security experience (exploitation, AD attacks, recon, tooling)
Solid documentation/reporting; ability to articulate vulnerabilities, impact, and remediation
ISO/IEC 42001 exposure or AI governance/audit experience
Experience across government, defence, space, and large enterprises
Location & work type: Remote-first across UK/US/EU clients; full-time; standard hours 9am–5pm (Mon–Fri); 20 days holiday. Some occasional client visits; ongoing engagement with government, defence, space, and FTSE 100 client
Penetration Tester (OSCP)
Location: Remote
Position Type: Full-time
Reports to: Senior Penetration Tester
About the Organisation A high-growth security consultancy working across government, space programmes, and FTSE 100 organisations is expanding its offensive security function. The team delivers complex, high-impact testing and simulation work for clients across the UK, US, and Europe. With a strong learning culture, excellent retention, and a track record of delivering cutting-edge work, this is an opportunity to develop quickly in a technically challenging environment.
Role Overview We’re looking for a Penetration Tester / Red Team Consultant with 1–3 years’ experience who thrives on variety, problem-solving, and continuous learning. You’ll deliver offensive security assessments, red team operations, and threat-led simulations across a wide range of sectors, often on weekly, part-time client engagements. The role is remote, with occasional client visits — though none have been required in the last five years.
Key Responsibilities Deliver red team, purple team, and wider offensive security engagements. Conduct attack simulations, threat modelling, and targeted technical testing. Carry out occasional physical security assessments. Produce high-quality penetration testing and red team reports. Communicate findings clearly to both technical and non-technical stakeholders. Support the development of offensive security services and internal methodologies. Contribute to R&D on tools, techniques, and emerging threats. Maintain a strong learning mindset and proactively grow technical capability.
Required Skills & Experience 1–3 years’ experience in penetration testing, red teaming, or offensive security. OSCP certification Strong understanding of operating systems, networks, and application security.
Practical offensive security experience: exploitation, AD attacks, recon, tooling, etc. Solid documentation and reporting skills. Ability to articulate vulnerabilities, impact, and remediation confidently.
Desirable: exposure to ISO/IEC 42001 or experience as an auditor in AI governance.
What We Offer Annual £5,000 development fund per person Excellent retention, strong pay progression, and a supportive technical culture. Work on government, defence, space, and major corporate engagements. Remote-first working across UK/US/EU clients.
Standard hours: 9am–5pm, Monday–Friday. 20 days holiday.