4 of 4 Permanent CHECK Team Member Jobs in the City of London

A premier UK consultancy is seeking a skilled and passionate Penetration Tester to join its growing team of cybersecurity experts. This is a dynamic opportunity for individuals with strong technical skills and a proactive mindset, eager to make a tangible impact across a wide range of client environments. Working on mission critical projects across National Security, Critical National Infrastructure … stakeholders Work directly with clients as a trusted advisor – this is a consulting-facing role Operate in sensitive, high-risk environments where mistakes have real consequences Contribute to improving team tooling, processes, and client methodology Be comfortable working autonomously without extensive documentation or runbooks Key Qualifications and Skills: Candidates who meet the following criteria … are strongly encouraged to apply – and even if every box isn’t ticked, applications are welcome, as related opportunities may also be available: Possesses industry-recognised certifications such as CTM, CSTM, CTL, CSTL, OSCP, or CREST/Cyber Scheme qualifications. Brings specialist knowledge in one or more areas of penetration testing – this could include mobile app security, cloud environments, operational More ❯

London (2 days per week on-site) Note: To be eligible for this role, you must be eligible for UK Security Clearance (SC). A high-performing digital security team is looking for an experienced Infrastructure Penetration Tester to join them in delivering critical assessments across complex and sensitive client environments. This is a hands-on internal testing role … environments Produce clear, concise reports tailored to both technical and non-technical audiences Build trusted relationships with clients in a consultancy-facing capacity Work within a small, high-trust team on sensitive engagements Contribute to the evolution of internal tooling and testing methodologies Operate effectively in environments with limited documentation or predefined processes Essential Experience and Skills At least … environments with technical debt Desirable Skills Python scripting or automation experience Understanding of Operational Technology (OT) networks Familiarity with internal infrastructure exploitation tools Certifications (preferred but not essential): CREST CTM, CTL, CSTM or Cyber Scheme Practitioner OSCP (current or lapsed) If you’re an experienced infrastructure penetration tester looking for meaningful work, we want to hear from you. More ❯

model | High-trust culture | Mission-critical work 🧭 The Opportunity Join a high-impact consultancy at the forefront of innovation and digital transformation. You’ll be part of a specialist team delivering critical infrastructure penetration tests across some of the most sensitive environments in the UK — from defence and national security to critical infrastructure and operational technology. This is not … through clear written reports and debriefs to a range of stakeholders Support sensitive clients operating in production environments — where mistakes matter Contribute to tooling, methodologies, and continuous improvement of team capability Engage with a technical and non-technical audience, acting as a trusted security advisor 🧠 What You Bring Core Skills: 4+ years of penetration testing experience (infrastructure/internal … line environments Desirable: Python scripting or automation experience Familiarity with OT (Operational Technology) networks Experience with tools like CrackMapExec, BloodHound, PowerView, etc. Certifications (a bonus, not a barrier): CREST CTM, CTL, CSTM, Cyber Scheme Practitioner OSCP Lapsed certifications are fine if practical skills are strong 👥 Team & Work Environment Tight-knit, high-performing team (2–3 people) with deep More ❯

figure it out, and adapt when things inevitably go sideways. Coding skills - Not essential, but if you can sling some Python around, it’ll help. Certs - OSCE, OSCE, CTL, CTM would be nice. But if you don’t have it and you know your stuff, that’s fine too. Consultancy experience - Again, preferred. If you’ve worked client-side before … you’ll get the vibe. Location: The team’s largely remote as it stands. Occasionally, you’ll need to rock up to a client site - so don’t apply if you plan on never leaving the house. Level: They’re open to solid testers up to Principal level. But don’t expect a slow ramp-up - they need someone More ❯