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Penetration Tester (CHECK) - UK remote - £50,000 - £90,000 + Benefits + Bonus Opus has partnered with a rapidly expanding UK cyber security consultancy to recruit experienced CHECK Penetration Testers. This organisation delivers high impact security testing across government, defence, and critical national infrastructure, and is looking to grow their team with professionals who hold active SC clearance and current CHECK status (CTM or CTL). Our client offer a variety of role responsibilities, in addition to CHECK Testing, you'll be able to work on red team engagements & non-CHECK testing engagements. Role Responsibilities • Deliver CHECK‑approved penetration testing across infrastructure, applications, cloud, and bespoke systems., • Conduct vulnerability assessments, exploitation, and technical security reviews in line with NCSC standards., • Produce clear, actionable reports and present findings to both technical and non‑technical stakeholders., • Support scoping and planning of engagements, including complex or multi‑phase assessments., • Contribute to internal tooling, methodology development, and knowledge sharing., • Stay current with emerging threats, vulnerabilities, and offensive security techniques. Mandatory Requirements • Active SC clearance., • Active CHECK status: CTM or CTL., • Strong experience delivering penetration testing across multiple domains., • Ability to communicate and consult with clients and key stakeholders and a technical and non technical level. What the Consultancy Offers • Competitive salary and performance based incentives., • Clear progression pathways, including training budgets for advanced certifications and CHECK level development., • Opportunities to influence tooling, methodology, and service offerings as the consultancy scales., • A culture that values technical excellence, curiosity, and continuous learning.

The Opportunity ProCheckUp, an elite independent cybersecurity consultancy serving FTSE 100 corporations, UK government authorities, and international financial institutions, is seeking an experienced Penetration Tester with SC Clearance to join our expanding remote team. This is an exceptional opportunity to conduct high-impact security assessments across diverse enterprise environments while maintaining work-life balance through flexible remote working. You'll contribute to ProCheckUp's ambitious expansion phase, working alongside industry-leading security professionals on mission-critical infrastructure, applications, and network security testing for the UK's most security-conscious organizations. What You'll Do Core Responsibilities: • Conduct advanced penetration testing across network infrastructure, web applications, and mobile platforms for enterprise clients, • Perform vulnerability assessments, threat modelling, and risk analysis across diverse technical environments, • Execute social engineering assessments and physical security testing, • Produce detailed scoping documents and executive-level penetration testing reports aligned with CREST and NCSC standards, • Lead incident response investigations and digital forensic analysis when required, • Work independently on client-facing assessments whilst collaborating with senior consultants and team leaders, • SCADA/OT environment security testing, • Cloud infrastructure penetration testing (AWS, Azure), • Web services and API security, • Mobile application testing (iOS/Android) Who You Are Essential Experience & Skills: • Minimum 3+ years professional penetration testing experience, • Demonstrable expertise in network, application, and infrastructure security testing, • Strong hands-on proficiency with penetration testing frameworks, exploitation techniques, and security tools (Metasploit, Burp Suite, Wireshark, custom tools), • Deep technical knowledge of Windows, Linux, Unix operating systems and TCP/IP networking protocols, • Proven ability to perform source code reviews and application security analysis, • Advanced understanding of web application vulnerabilities (OWASP Top 10) and mitigation strategies, • Excellent report writing and executive communication skills—ability to translate technical findings into business risk, • Ability to work autonomously and adapt to client-specific environments, • CREST/CyberScheme CCTM/CSTM CCT/CSTL-INF or CCT/CSTL-APP (current), • NCSC CHECK Team Leader (CTL) (current) or CHECK Team Member (CTM) (current) preferred but not essential, • CEH Advanced (AECH) or OSCP, • SANS GCIH, GPEN, or GWAPT, • EnCase Certified Examiner (EnCE), • CWSP (Certified Wireless Security Professional), • Published security research, CVE disclosures, or white papers, • Curiosity and passion for emerging security threats and attack methodologies, • Drive to mentor junior consultants and contribute to technical innovation, • Professional demeanour with excellent client-facing communication, • Attention to detail in all deliverables, particularly technical reports and evidence documentation Why ProCheckUp? ✓ Proven Track Record: 25+ years delivering security services to world-leading organisations; holders of NCSC CHECK, CREST, PCI QSA, and PCI ASV accreditation's ✓ Prestigious Client Base: Work directly with FTSE 100 companies, UK government bodies, international law firms, and critical infrastructure operators ✓ Technical Leadership: Collaborate with industry experts who publish research, present at major conferences, and drive the cybersecurity industry forward ✓ Flexibility & Autonomy: Remote-first working with complete location flexibility across the UK—work from home, co-working spaces, or client sites as you prefer ✓ Career Progression: Clear advancement pathway from Consultant → Senior Consultant → Team Leader → Technical Director; investment in advanced certifications and professional development ✓ Competitive Remuneration: Market-leading salary package (£65,000–£85,000+ depending on experience and certifications) plus comprehensive benefits ✓ Backing of a Stable, Well-Funded Firm: Work for an independent, profitable, growth-focused security consultancy—not a commodity testing mill ✓ Continuous Learning: Access to research funding, certification sponsorship, conference attendance, and exposure to cutting-edge threat landscapes The Application Process This is a carefully selected search—we're looking for genuine penetration testing professionals with the technical depth to advise enterprise clients, not script-runner-test shops. To Apply: • Submit your CV (including certifications, security clearance status, and estimated clearance renewal date), • Write a brief covering letter (150–250 words) addressing:, • Why ProCheckUp's mission and client base appeal to you, • Your remote working setup and availability (notice period, start date), • Screening call with HR (15 mins): Verify background, clearance status, and role fit, • Technical interview with Senior Consultant (45 mins): Deep-dive on penetration testing methodology, recent case studies, and security trends, • Final interview with Hiring Manager/Technical Director (30 mins): Culture fit, growth ambition, and team dynamics Logistics | Position Type | Full-Time, Permanent | | Location | Remote, United Kingdom | | Security Clearance | SC (Minimum) | | Working Arrangements | Flexible remote; occasional travel for client engagements | | Salary | £65,000–£95,000+ based on experience, certifications, and client-facing impact | | Benefits Package | Competitive pension, health insurance, professional development budget, | | Notice Period | 2-8 weeks preferred; negotiable for exceptional candidates | About ProCheckUp Founded in 1999, ProCheckUp has evolved from a specialist penetration testing firm into a multi-disciplinary cybersecurity consultancy trusted by the world's most security-conscious organizations. Our team of CHECK Team Leaders, CREST Certified Testers, and forensic specialists delivers: • Penetration Testing & Security Audits: Infrastructure, application, and mobile assessments, • Compliance Advisory: PCI DSS, GDPR, ISO27001 implementations and certifications, • Incident Response & Forensics: 24/7 emergency response and digital evidence analysis Equal Opportunities ProCheckUp is an equal opportunities employer. We celebrate diversity and are committed to building an inclusive environment for all employees, regardless of gender, race, ethnicity, religion, disability, age, sexual orientation, or gender identity. We encourage applications from underrepresented groups in cybersecurity. Security Vetting: All successful candidates will be subject to UK security vetting procedures. Applicants must have resided in the UK for the last 5+ years to be eligible for SC clearance (or provide documented reasons for absence). Previous security clearance experience is valued but not essential. *

Penetration Tester / Cyber Security Consultant | £45-50k | Active SC NeededWe're working with a growing UK cyber security consultancy delivering penetration testing services to government and public sector organisations. They're looking for a Cyber Security Consultant / Penetration Tester to join t

This role suits penetration testers who want to operate in a consulting environment, working across multiple clients and gaining exposure to complex, large-scale systems. They are now hiring a Penetration Tester into their Offensive Security team. This is a hands-on role focused on delivering penetr

Penetration Tester (CHECK Team Member). Penetration Tester (CHECK Team Member). Deliver high-quality penetration tests and vulnerability assessments.

This team is led by an active penetration tester who understands the niggles of day penetration testing operations. Despite being a CHECK penetration testing provider, the business is increasingly focused on commercial engagements in areas we know are proving popular amongst testers. If you thrive o

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Get notified about new Penetration Tester jobs in. Deliver external penetration testing services — from scoping and testing to risk analysis and reporting. Practical experience in penetration testing across networks, applications, and cloud environments.

The team is hiring a Penetration Tester to perform security assessments, identify vulnerabilities, and provide actionable recommendations to enhance defence strategies. Mentor and support junior penetration testers, ensuring consistent delivery quality and professional growth. Lead the scoping, exec

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We have an exciting opportunity for a Senior Penetration Tester to join our thriving Cyber Security practice. We are seeking a skilled individual, with expertise in penetration testing or vulnerability research, who can contribute to the development of innovative solutions and security outcomes to s

A leading UK fintech company is seeking an experienced Penetration Tester to enhance its security framework. This hybrid role is ideal for candidates with a strong technical background in cloud security and penetration testing, contributing to a collaborative environment where you can drive signific

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A leading cybersecurity consultancy in the UK is seeking a Senior Penetration Tester to join their skilled team. The ideal candidate will have over 4 years of hands-on penetration testing experience with a desire to gain further qualifications.

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We are seeking an experienced Senior Hardware/Embedded Penetration Tester to assess the security of hardware and embedded systems and provide actionable recommendations. Perform hardware and/or firmware penetration tests. Create and deliver penetration test reports to clients.

We are looking for an experienced Penetration Tester who can bridge the gap between deep technical exploitation and real-world business risk. Additionally, we understand the importance of knowledge and expertise remaining current and you shall support the continued advancement of our penetration tes

A leading cybersecurity firm in the United Kingdom is looking for a Penetration Tester. The successful candidate will be responsible for conducting penetration tests, identifying security vulnerabilities, and providing clients with detailed reports. Candidates should have over 2 years of experience

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Security Penetration Tester / Red Team Lead - AI, london.

Would be nice have CREST Registered Penetration Tester (CRT). Offensive Security Tester / REMOTE. Conduct comprehensive penetration tests across web applications, network infrastructure, and mobile applications.

These Penetration Tester opportunities will pay an annual salary up to £55,000, a 10% Annual Bonus, 10% Company Pension, Private Health and Dental Care and lots more!. With that, we’re seeking Penetration Testers that have / are interested in;. We are looking for several Penetration Testers with

A leading consulting firm in Birmingham is seeking a Cyber Security Consultant (Penetration Tester) to deliver offensive security services across industries. The ideal candidate has substantial experience in penetration testing and is proficient with security tools like Kali Linux and Burp Suite.

A leading consulting firm in Greater London is looking for a penetration tester to deliver high-quality security assessments and collaborate with multiple teams. The ideal candidate will have relevant certifications and a strong knowledge background in various penetration testing fields.

Penetration Tester and play a key role in protecting our clients’ critical systems, many of which operate in highly sensitive and regulated environments. Working alongside experienced consultants, you’ll deliver high-quality penetration testing engagements, contribute to continuous improvement,

Security Penetration Tester / Red Team Lead - AI.

As an experienced Penetration Tester you will be working with talented cyber security professionals to protect Starling customers, company assets and systems using the latest technologies and techniques. First stage with the Penetration Testing Team Lead. Second stage with additional members of the

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A leading cybersecurity firm in London seeks a Security Penetration Tester / Red Team Lead specializing in AI security.

Cyber Security Consultant / Penetration Tester. Penetration Tester / Cyber Security Consultant | £45-50k | Active SC Needed. We’re working with a growing UK cyber security consultancy delivering penetration testing services to government and public sector organisations.