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Role: Penetration Tester Location: Leeds (Hybrid + Site Visits) Salary: £40,000 - £45,000 DOE Type: Permanent, Full-TimeSummary: We are looking for a skilled and motivated Penetration Tester to join a growing security team in Leeds. The main purpose of this role is to deliver high-quality offensive security assessments across web applications, APIs, and infrastructure, helping clients understand and remediate vulnerabilities across their environments. This is a great opportunity for a CHECK Team Member (CTM) or a tester actively progressing along the CREST pathway (CRT) to take ownership of engagements end-to-end, work alongside experienced consultants, and continue developing technically across a varied client base. This role operates on a hybrid basis in Leeds, with occasional site visits required.Key Responsibilities: • Carry out web application, API, and infrastructure penetration tests, taking ownership of engagements from scoping through to final report delivery., • Support purple team activities including phishing simulations and malicious insider style assessments., • Produce clear, professional reports for clients, tailoring findings to client-specific context and business risk., • Communicate high-risk vulnerabilities to clients as they are identified, supporting swift remediation., • Support junior team members and assist with quality assurance on reports where required., • Assist with the maintenance of internal penetration testing infrastructure, including device setup and tooling updates., • CHECK Team Member (CTM) status, or actively working towards CREST Registered Tester (CRT) on the CREST pathway., • Hands-on experience delivering web application, API, and/or infrastructure penetration tests in a professional setting., • Strong understanding of common vulnerability classes (e.g. OWASP Top 10), exploitation techniques, and remediation guidance., • Confident client-facing communication skills, with the ability to explain technical findings to both technical and non-technical audiences., • Strong written reporting skills, with the ability to produce clear, well-structured deliverables., • Salary: £40,000 - £45,000 DOE, • Hybrid Working Oscar Associates (UK) Limited is acting as an Employment Agency in relation to this vacancy. To understand more about what we do with your data please review our privacy policy in the privacy section of the Oscar website.

A high-growth technology consultancy is scaling its global penetration testing capability and needs a strong leader to take the reins. Leading the day-to-day performance and operations of a multi-region penetration testing practice. Strong background in penetration testing acro.

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. *

A rapidly scaling cybersecurity consultancy is looking to hire a Head of Penetration Testing to take ownership of a growing, high-performing offensive security function. This is a leadership role with deep hands‑on responsibility, driving operational excellence, leading complex penetration testing

A leading cybersecurity consultancy in Leeds is seeking a Head of Penetration Testing to drive operational excellence and lead a high-performing security function. This pivotal role requires strong experience in penetration testing and team leadership, enabling the successful delivery of complex eng

Network Engineer (Data Network Services) – Contract Location: Leeds (Hybrid) Rate: £375 – £450 per day inside IR35 Contract Length: 6 months Start Date: ASAP Working Pattern: Hybrid (some travel and occasional weekend support may be required) Overview Our client is seeking experienced Network Engineers to join their Network Service Data Team, providing day‑to‑day support for incidents and change requests across a large, enterprise‑scale environment. This role is ideal for engineers who enjoy working across the full lifecycle of network services—from design and implementation through to live transition and operational support—while applying modern engineering principles to deliver secure, resilient and scalable infrastructure. Key Responsibilities * Installation, configuration, and support of Production, Non‑Production, and Disaster Recovery network infrastructures * Support and resolution of incidents and delivery of network change requests * Design, documentation, and implementation of network infrastructure across development, testing, and live environments * Apply modern engineering practices including: * Software Defined Networking (SDN) * Automation and orchestration * Infrastructure as Code (IaC) * Advanced observability and monitoring * Ensure secure, reliable, and highly available network services in an enterprise environment Key Skills & Experience * Strong experience designing, implementing, and supporting LAN and WAN networks * Solid understanding of IP networking * Knowledge of core routing and switching protocols (OSPF, BGP, Spanning Tree) to CCNA level or equivalent * Proven experience securing internet‑facing services * DNS and DHCP experience across Windows, Unix, and internet environments * Understanding of vulnerability assessment and penetration testing * Excellent troubleshooting, fault diagnosis, and resolution skills Desirable Technical Experience * Security and firewall technologies, including Cisco FTD and Check Point * F5 Application Delivery Controllers * Cisco Wireless and Cisco Secure Access * Cisco ACI and Cisco Hybrid ZTNA * Scripting, automation, and Infrastructure as Code If you have the required skills & experience, please apply promptly to be considered