1 to 25 of 35 Permanent Penetration Testing Jobs in the South East

Principal Offensive Security Consultant £100k Location: Hybrid (2 days per month in London) Salary: £80,000 - £100,000 + benefits Are you a Senior Offensive Security Consultant or Principal Penetration Tester ready to take the next step into Red Teaming and Adversarial Simulation This is your opportunity to join an agile, rapidly growing UK cyber security consultancy where you … to research and tooling that truly make an impact. About the Role As a Senior/Principal Offensive Consultant , you'll lead complex technical engagements that go beyond standard penetration testing - focusing on advanced exploitative infrastructure testing , Active Directory compromise , and assumed breach assessments . You'll work directly with clients to scope, plan, and deliver high … impact projects, while helping to expand the organisation's Red Team and adversarial simulation services . Key Responsibilities: Lead and deliver high-level infrastructure and Active Directory penetration testing engagements. Conduct advanced exploitative testing , lateral movement analysis, and privilege escalation within real-world environments. Support presales activity - crafting scopes, proposals, and technical solutions aligned with client objectives. More ❯

Penetration Tester - Leading Managed Services Provider Remote based. Salary: Up to 60k, depending on experience. A leading Managed Services Provider are seeking to recruit a technically skilled Cyber Security/Penetration Tester. This is a fantastic opportunity to join a well-established organisation delivering high-quality security services to enterprise clients across the UK. As a Penetration Tester, you will be responsible for conducting manual penetration testing across both application and infrastructure layers. You will contribute to secure build reviews, advise on secure design practices, and provide technical insight to both internal teams and clients. Key Responsibilities Perform manual penetration testing of web applications and infrastructure Conduct security build reviews across common … and concise technical reports for a range of stakeholders Collaborate with internal teams and clients to support remediation and secure development Required Skills and Experience Proven experience in manual penetration testing (application and infrastructure) Strong understanding of TCP/IP and core networking principles Extensive experience testing web-based applications Familiarity with secure configuration and build reviews More ❯

Network Security Engineer Network Security/Penetration Testing/CREST/CSTL/API Testing/Config Reviews/Infrastructure/Outside IR35/West London We’re seeking an experienced Network Security Engineer to support a major multi-phase security testing project. You’ll conduct penetration tests, configuration reviews, and infrastructure assessments, contributing to … a high-profile programme of work extending into next year. Required Strong background in network and infrastructure security. Experience performing penetration testing, configuration reviews, and API testing. Knowledge of “classic” CHECK-style testing methodologies. CREST, CSTL or CTL certification (Team Member or Team Leader level). Ability to deliver high-quality reports and communicate technical findings clearly. … Hands-on experience across infrastructure, networking, and external testing. Desirable Experience working within CHECK or other accredited testing schemes. Strong understanding of secure network architecture and hardening practices. Previous consultancy or project-based testing experience. Contract Details Outside IR35 West London (on-site presence required for majority of testing) 0-hours contract – project-based work, phase by More ❯

Network Security Engineer Network Security/Penetration Testing/CREST/CSTL/API Testing/Config Reviews/Infrastructure/Outside IR35/West London We’re seeking an experienced Network Security Engineer to support a major multi-phase security testing project. You’ll conduct penetration tests, configuration reviews, and infrastructure assessments, contributing to … a high-profile programme of work extending into next year. Required Strong background in network and infrastructure security. Experience performing penetration testing, configuration reviews, and API testing. Knowledge of “classic” CHECK-style testing methodologies. CREST, CSTL or CTL certification (Team Member or Team Leader level). Ability to deliver high-quality reports and communicate technical findings clearly. … Hands-on experience across infrastructure, networking, and external testing. Desirable Experience working within CHECK or other accredited testing schemes. Strong understanding of secure network architecture and hardening practices. Previous consultancy or project-based testing experience. Contract Details Outside IR35 West London (on-site presence required for majority of testing) 0-hours contract – project-based work, phase by More ❯

Penetration Tester – Cyber Security Contract until December 2025 (extension likely) Hybrid working, 50/50 split between home and site in Berkshire Active SC clearance required ABOUT THE CLIENT: Our client is a leading organisation within the cyber and defence technology sector, delivering secure digital solutions to UK government and critical national infrastructure programmes. They are expanding their cyber … capability and are seeking an experienced Penetration Tester to join the team on a long-term contract, supporting a range of high-impact security projects. THE PENETRATION TESTER ROLE: As a Penetration Tester, you will perform manual and automated testing across web applications, networks, APIs, and mobile platforms. You’ll identify and document vulnerabilities, support red … team operations, and collaborate with development and infrastructure teams to ensure effective remediation and security improvements. Key responsibilities include: Conducting penetration tests and vulnerability assessments across multiple environments Performing red team and threat simulation exercises Producing detailed reports outlining findings, risks, and mitigation strategies Staying current with emerging attack vectors, tools, and exploits Contributing to internal security awareness and More ❯

Penetration Tester – Cyber Security Contract until December 2025 (extension likely) Hybrid working, 50/50 split between home and site in Berkshire Active SC clearance required ABOUT THE CLIENT: Our client is a leading organisation within the cyber and defence technology sector, delivering secure digital solutions to UK government and critical national infrastructure programmes. They are expanding their cyber … capability and are seeking an experienced Penetration Tester to join the team on a long-term contract, supporting a range of high-impact security projects. THE PENETRATION TESTER ROLE: As a Penetration Tester, you will perform manual and automated testing across web applications, networks, APIs, and mobile platforms. You’ll identify and document vulnerabilities, support red … team operations, and collaborate with development and infrastructure teams to ensure effective remediation and security improvements. Key responsibilities include: Conducting penetration tests and vulnerability assessments across multiple environments Performing red team and threat simulation exercises Producing detailed reports outlining findings, risks, and mitigation strategies Staying current with emerging attack vectors, tools, and exploits Contributing to internal security awareness and More ❯

well as carrying out manual reviews to discover any issues with customer infrastructure and web applications. You'll be pro-active and will have the opportunity within Red Team testing to try anything and everything to outmanoeuvre the defenders and gain access to customer networks. WFH Policy: There's a remote interview/onboarding process and the ability to … top tier world university - Computer Science, Engineering, Physics or Mathematics; MSc or PhD advantageous You're OSCP or CRT certified You have commercial experience with Offensive Security, Red Team testing or Penetration testing You have a keen interest in Cyber Security and understanding of key concepts and protocols You can code with any OO programming language (e.g. More ❯

development of cyber security strategies and roadmaps Technical proficiency in a wide range of cyber risk management services, including cyber threat, risk and control assessments, secure software development practices, penetration testing, vulnerability assessments, among others Sound knowledge of applicable laws, compliance regulations, and industry standards as it relates to privacy, security, and compliance Sound knowledge of applicable frameworks More ❯

development of cyber security strategies and roadmaps Technical proficiency in a wide range of cyber risk management services, including cyber threat, risk and control assessments, secure software development practices, penetration testing, vulnerability assessments, among others Sound knowledge of applicable laws, compliance regulations, and industry standards as it relates to privacy, security, and compliance Sound knowledge of applicable frameworks More ❯

concepts Strong analytical and problem-solving skills Good communication skills and the ability to explain technical concepts clearly Nice to Have (But Not Required): Personal or academic experience with penetration testing, malware analysis, or security tools Knowledge of scripting (e.g. Python, Bash, PowerShell) Internship, placement, or lab-based university project in security Familiarity with security frameworks or certifications … real users and systems Mentoring : One-on-one support to help you grow professionally and personally Career Pathways : Clear progression into specialised roles such as SOC Analyst, Security Engineer, Penetration Tester, or Risk Analyst Collaborative Culture : Join a team that values innovation, integrity, and inclusion Excellent Company Benefits We believe in supporting our people from day one. Here’s More ❯

secure, innovative solutions across industries. We foster collaboration, inclusion, and continuous growth, with networks supporting diversity, equity, and belonging. What You'll do: Lead and manage threat intelligence-led penetration tests across applications, infrastructure, cloud (AWS/Azure/O365), APIs, and OT Develop advanced test plans, identify critical assets, and deliver detailed, actionable reports for technical and business … team capabilities Contribute to research on emerging threats and attack techniques to strengthen proactive security What You'll Bring: CREST CRT (or higher) certification - essential 5+ years' experience in penetration testing with strong understanding of adversarial tactics and threat intelligence Expertise across network, cryptography, vulnerabilities, and attack vectors Strong communication and reporting skills Experience with Breach Attack Simulation More ❯

response for security risks and issues raised by SOC teams Manage implementation of logging and SIEM integration for comprehensive monitoring Prioritise and oversee vulnerability remediation across the platform Support penetration testing activities and security audits Collaboration & Leadership: Build strong relationships with central security teams and contribute to communities of practice Manage escalations of security-related issues, risks, and More ❯

in London, is a global Cybersecurity advisory firm. They are hiring a Senior Pentester in London (hybrid, 2x day a week in London offices). Responsibilities: Lead and deliver penetration tests across various industries, including infrastructure, technology, healthcare, financial services, and retail. Engage directly with clients, building credibility and strong professional relationships. Oversee end-to-end testing, from … remaining undetected by XDR/IDS/IPS/EDR systems. Conduct physical security assessments, including covert access operations. Qualifications & Skills: 5 - 10 years of experience in hands-on penetration testing/red teaming/Offensive Security operations with consulting/client-facing experience. Experience as a CHECK Team Lead. Proficiency in scripting and programming languages such as More ❯

in London, is a global Cybersecurity advisory firm. They are hiring a Senior Pentester in London (hybrid, 2x day a week in London offices). Responsibilities: Lead and deliver penetration tests across various industries, including infrastructure, technology, healthcare, financial services, and retail. Engage directly with clients, building credibility and strong professional relationships. Oversee end-to-end testing, from … remaining undetected by XDR/IDS/IPS/EDR systems. Conduct physical security assessments, including covert access operations. Qualifications & Skills: 5 - 10 years of experience in hands-on penetration testing/red teaming/Offensive Security operations with consulting/client-facing experience. Experience as a CHECK Team Lead. Proficiency in scripting and programming languages such as More ❯

Leading the cultural shift towards secure software development across product teams Defining and implementing the software security strategy in line with business goals Collaborating with developers to automate security testing and embed security requirements into the SDLC Supporting penetration testing, vulnerability management, and remediation efforts Acting as a software security SME, advising teams on secure design, risk More ❯

Manage security environments across Azure and AWS infrastructure. Lead incident response efforts and coordinate vulnerability remediation activities. Manage continuous security monitoring, alerting, and detection systems. Administer vulnerability management and penetration testing programs. Maintain strong identity, access, and privilege management controls. Compliance & Assurance (30%) Manage and maintain ISO 27001 certification and audit processes. Ensure ongoing compliance with PCI DSS More ❯

background in incident response, SOC operations, and security investigations. Hands-on expertise with SIEM tools (Splunk, QRadar, Microsoft Sentinel). Deep understanding of network traffic analysis, vulnerability management, and penetration testing. Knowledge of DFIR principles, malware reverse engineering, and digital forensics. Familiarity with ITIL processes (Incident, Problem, Change). Experience with cloud platforms (AWS and/or Azure). More ❯

AWS security controls, policies, and automation- Role-based and attribute-based access controls- Cryptographic protocols and secure key lifecycle management- Securing microservices, APIs, and DevSecOps best practices Skilled in penetration testing and hands-on coding with JavaScript, Java, or Python Strong understanding of vulnerability scanning, remediation, and vendor management Collaborative mindset with the ability to partner across engineering More ❯

experience with security frameworks (NIST, ISO 27001) and a proven track record of securing large-scale, high-availability systems. You are adept at threat modelling, security architecture review, and penetration testing concepts. Prior experience in the O&G (Oil & Gas) sector, government projects, or other critical infrastructure is a significant advantage. You are entrepreneurial, thrive in a start More ❯

Engineer will have first-class scoping and planning skills. The IT Project Engineer will host security consultations and conduct vulnerability assessments. The IT Project Engineer will oversee and direct Penetration Testing exercises. The IT Project Engineer will be familiar with Cyber Essentials, Microsoft Copilot and PCI-DSS. The IT Project Engineer will be network-savvy. Think firewalls, switches More ❯

Engineer will have first-class scoping and planning skills. The IT Project Engineer will host security consultations and conduct vulnerability assessments. The IT Project Engineer will oversee and direct Penetration Testing exercises. The IT Project Engineer will be familiar with Cyber Essentials, Microsoft Copilot and PCI-DSS. The IT Project Engineer will be network-savvy. Think firewalls, switches More ❯

Engineer will have first-class scoping and planning skills. The IT Project Engineer will host security consultations and conduct vulnerability assessments. The IT Project Engineer will oversee and direct Penetration Testing exercises. The IT Project Engineer will be familiar with Cyber Essentials, Microsoft Copilot and PCI-DSS. The IT Project Engineer will be network-savvy. Think firewalls, switches More ❯

initiatives. Key Responsibilities Develop and execute an information security strategy and roadmap aligned with business goals. Lead on governance, compliance, and audit processes across the organisation. Manage incident response, penetration testing, and risk assessments. Support secure software development and supplier risk management. Promote security awareness and report regularly to senior leadership on risk posture. Skills & Experience Required Previous More ❯

Senior Security Engineer you will implement and maintain robust security systems and protocols across the company's IT infrastructure, conducting risk assessments and vulnerability scans, mitigating vulnerabilities identified in penetration testing and implementing preventative measures to protect against cyber threats with a focus on WAF, IDS, IPS, Windows Security and Palo Alto firewalls. You also manage the 3rd More ❯

Senior Security Engineer you will implement and maintain robust security systems and protocols across the company's IT infrastructure, conducting risk assessments and vulnerability scans, mitigating vulnerabilities identified in penetration testing and implementing preventative measures to protect against cyber threats with a focus on WAF, IDS, IPS, Windows Security and Palo Alto firewalls. You also manage the 3rd More ❯