26 to 50 of 53 Penetration Testing Jobs in the South East

You’re walking into a mature environment: The company already has Secure SDLC and DevSecOps practices in place. This isn’t a ground-up build – it’s about stress-testing and strengthening what’s already built. You’ll have impact and visibility: Reporting to the CIO, with close collaboration with the Head of Information Security (compliance), you’ll shape … You’ll Be Doing: Actively identifying vulnerabilities in applications, especially around authentication flows, payments, and sensitive data handling Thinking creatively and adversarially – “breaking the app” to protect it Performing penetration testing, threat modelling, and secure code reviews Working directly with developers to integrate security best practices into an already-operational DevSecOps pipeline Advising on product and architectural design … culture that prioritises customer trust and system integrity What We’re Looking For: Deep hands-on experience in application security – not just theory, but experience in secure coding, manual testing, and fixing complex vulnerabilities A proven background in credit cards, payments, or financial transaction systems Understanding of modern application architectures (APIs, microservices, cloud platforms – likely Azure) Familiarity with OWASP More ❯

You’re walking into a mature environment: The company already has Secure SDLC and DevSecOps practices in place. This isn’t a ground-up build – it’s about stress-testing and strengthening what’s already built. You’ll have impact and visibility: Reporting to the CIO, with close collaboration with the Head of Information Security (compliance), you’ll shape … You’ll Be Doing: Actively identifying vulnerabilities in applications, especially around authentication flows, payments, and sensitive data handling Thinking creatively and adversarially – “breaking the app” to protect it Performing penetration testing, threat modelling, and secure code reviews Working directly with developers to integrate security best practices into an already-operational DevSecOps pipeline Advising on product and architectural design … culture that prioritises customer trust and system integrity What We’re Looking For: Deep hands-on experience in application security – not just theory, but experience in secure coding, manual testing, and fixing complex vulnerabilities A proven background in credit cards, payments, or financial transaction systems Understanding of modern application architectures (APIs, microservices, cloud platforms – likely Azure) Familiarity with OWASP More ❯

You’re walking into a mature environment: The company already has Secure SDLC and DevSecOps practices in place. This isn’t a ground-up build – it’s about stress-testing and strengthening what’s already built. You’ll have impact and visibility: Reporting to the CIO, with close collaboration with the Head of Information Security (compliance), you’ll shape … You’ll Be Doing: Actively identifying vulnerabilities in applications, especially around authentication flows, payments, and sensitive data handling Thinking creatively and adversarially – “breaking the app” to protect it Performing penetration testing, threat modelling, and secure code reviews Working directly with developers to integrate security best practices into an already-operational DevSecOps pipeline Advising on product and architectural design … culture that prioritises customer trust and system integrity What We’re Looking For: Deep hands-on experience in application security – not just theory, but experience in secure coding, manual testing, and fixing complex vulnerabilities A proven background in credit cards, payments, or financial transaction systems Understanding of modern application architectures (APIs, microservices, cloud platforms – likely Azure) Familiarity with OWASP More ❯

You’re walking into a mature environment: The company already has Secure SDLC and DevSecOps practices in place. This isn’t a ground-up build – it’s about stress-testing and strengthening what’s already built. You’ll have impact and visibility: Reporting to the CIO, with close collaboration with the Head of Information Security (compliance), you’ll shape … You’ll Be Doing: Actively identifying vulnerabilities in applications, especially around authentication flows, payments, and sensitive data handling Thinking creatively and adversarially – “breaking the app” to protect it Performing penetration testing, threat modelling, and secure code reviews Working directly with developers to integrate security best practices into an already-operational DevSecOps pipeline Advising on product and architectural design … culture that prioritises customer trust and system integrity What We’re Looking For: Deep hands-on experience in application security – not just theory, but experience in secure coding, manual testing, and fixing complex vulnerabilities A proven background in credit cards, payments, or financial transaction systems Understanding of modern application architectures (APIs, microservices, cloud platforms – likely Azure) Familiarity with OWASP More ❯

You’re walking into a mature environment: The company already has Secure SDLC and DevSecOps practices in place. This isn’t a ground-up build – it’s about stress-testing and strengthening what’s already built. You’ll have impact and visibility: Reporting to the CIO, with close collaboration with the Head of Information Security (compliance), you’ll shape … You’ll Be Doing: Actively identifying vulnerabilities in applications, especially around authentication flows, payments, and sensitive data handling Thinking creatively and adversarially – “breaking the app” to protect it Performing penetration testing, threat modelling, and secure code reviews Working directly with developers to integrate security best practices into an already-operational DevSecOps pipeline Advising on product and architectural design … culture that prioritises customer trust and system integrity What We’re Looking For: Deep hands-on experience in application security – not just theory, but experience in secure coding, manual testing, and fixing complex vulnerabilities A proven background in credit cards, payments, or financial transaction systems Understanding of modern application architectures (APIs, microservices, cloud platforms – likely Azure) Familiarity with OWASP More ❯

You’re walking into a mature environment: The company already has Secure SDLC and DevSecOps practices in place. This isn’t a ground-up build – it’s about stress-testing and strengthening what’s already built. You’ll have impact and visibility: Reporting to the CIO, with close collaboration with the Head of Information Security (compliance), you’ll shape … You’ll Be Doing: Actively identifying vulnerabilities in applications, especially around authentication flows, payments, and sensitive data handling Thinking creatively and adversarially – “breaking the app” to protect it Performing penetration testing, threat modelling, and secure code reviews Working directly with developers to integrate security best practices into an already-operational DevSecOps pipeline Advising on product and architectural design … culture that prioritises customer trust and system integrity What We’re Looking For: Deep hands-on experience in application security – not just theory, but experience in secure coding, manual testing, and fixing complex vulnerabilities A proven background in credit cards, payments, or financial transaction systems Understanding of modern application architectures (APIs, microservices, cloud platforms – likely Azure) Familiarity with OWASP More ❯

You’re walking into a mature environment: The company already has Secure SDLC and DevSecOps practices in place. This isn’t a ground-up build – it’s about stress-testing and strengthening what’s already built. You’ll have impact and visibility: Reporting to the CIO, with close collaboration with the Head of Information Security (compliance), you’ll shape … You’ll Be Doing: Actively identifying vulnerabilities in applications, especially around authentication flows, payments, and sensitive data handling Thinking creatively and adversarially – “breaking the app” to protect it Performing penetration testing, threat modelling, and secure code reviews Working directly with developers to integrate security best practices into an already-operational DevSecOps pipeline Advising on product and architectural design … culture that prioritises customer trust and system integrity What We’re Looking For: Deep hands-on experience in application security – not just theory, but experience in secure coding, manual testing, and fixing complex vulnerabilities A proven background in credit cards, payments, or financial transaction systems Understanding of modern application architectures (APIs, microservices, cloud platforms – likely Azure) Familiarity with OWASP More ❯

You’re walking into a mature environment: The company already has Secure SDLC and DevSecOps practices in place. This isn’t a ground-up build – it’s about stress-testing and strengthening what’s already built. You’ll have impact and visibility: Reporting to the CIO, with close collaboration with the Head of Information Security (compliance), you’ll shape … You’ll Be Doing: Actively identifying vulnerabilities in applications, especially around authentication flows, payments, and sensitive data handling Thinking creatively and adversarially – “breaking the app” to protect it Performing penetration testing, threat modelling, and secure code reviews Working directly with developers to integrate security best practices into an already-operational DevSecOps pipeline Advising on product and architectural design … culture that prioritises customer trust and system integrity What We’re Looking For: Deep hands-on experience in application security – not just theory, but experience in secure coding, manual testing, and fixing complex vulnerabilities A proven background in credit cards, payments, or financial transaction systems Understanding of modern application architectures (APIs, microservices, cloud platforms – likely Azure) Familiarity with OWASP More ❯

You’re walking into a mature environment: The company already has Secure SDLC and DevSecOps practices in place. This isn’t a ground-up build – it’s about stress-testing and strengthening what’s already built. You’ll have impact and visibility: Reporting to the CIO, with close collaboration with the Head of Information Security (compliance), you’ll shape … You’ll Be Doing: Actively identifying vulnerabilities in applications, especially around authentication flows, payments, and sensitive data handling Thinking creatively and adversarially – “breaking the app” to protect it Performing penetration testing, threat modelling, and secure code reviews Working directly with developers to integrate security best practices into an already-operational DevSecOps pipeline Advising on product and architectural design … culture that prioritises customer trust and system integrity What We’re Looking For: Deep hands-on experience in application security – not just theory, but experience in secure coding, manual testing, and fixing complex vulnerabilities A proven background in credit cards, payments, or financial transaction systems Understanding of modern application architectures (APIs, microservices, cloud platforms – likely Azure) Familiarity with OWASP More ❯

You’re walking into a mature environment: The company already has Secure SDLC and DevSecOps practices in place. This isn’t a ground-up build – it’s about stress-testing and strengthening what’s already built. You’ll have impact and visibility: Reporting to the CIO, with close collaboration with the Head of Information Security (compliance), you’ll shape … You’ll Be Doing: Actively identifying vulnerabilities in applications, especially around authentication flows, payments, and sensitive data handling Thinking creatively and adversarially – “breaking the app” to protect it Performing penetration testing, threat modelling, and secure code reviews Working directly with developers to integrate security best practices into an already-operational DevSecOps pipeline Advising on product and architectural design … culture that prioritises customer trust and system integrity What We’re Looking For: Deep hands-on experience in application security – not just theory, but experience in secure coding, manual testing, and fixing complex vulnerabilities A proven background in credit cards, payments, or financial transaction systems Understanding of modern application architectures (APIs, microservices, cloud platforms – likely Azure) Familiarity with OWASP More ❯

You’re walking into a mature environment: The company already has Secure SDLC and DevSecOps practices in place. This isn’t a ground-up build – it’s about stress-testing and strengthening what’s already built. You’ll have impact and visibility: Reporting to the CIO, with close collaboration with the Head of Information Security (compliance), you’ll shape … You’ll Be Doing: Actively identifying vulnerabilities in applications, especially around authentication flows, payments, and sensitive data handling Thinking creatively and adversarially – “breaking the app” to protect it Performing penetration testing, threat modelling, and secure code reviews Working directly with developers to integrate security best practices into an already-operational DevSecOps pipeline Advising on product and architectural design … culture that prioritises customer trust and system integrity What We’re Looking For: Deep hands-on experience in application security – not just theory, but experience in secure coding, manual testing, and fixing complex vulnerabilities A proven background in credit cards, payments, or financial transaction systems Understanding of modern application architectures (APIs, microservices, cloud platforms – likely Azure) Familiarity with OWASP More ❯

You’re walking into a mature environment: The company already has Secure SDLC and DevSecOps practices in place. This isn’t a ground-up build – it’s about stress-testing and strengthening what’s already built. You’ll have impact and visibility: Reporting to the CIO, with close collaboration with the Head of Information Security (compliance), you’ll shape … You’ll Be Doing: Actively identifying vulnerabilities in applications, especially around authentication flows, payments, and sensitive data handling Thinking creatively and adversarially – “breaking the app” to protect it Performing penetration testing, threat modelling, and secure code reviews Working directly with developers to integrate security best practices into an already-operational DevSecOps pipeline Advising on product and architectural design … culture that prioritises customer trust and system integrity What We’re Looking For: Deep hands-on experience in application security – not just theory, but experience in secure coding, manual testing, and fixing complex vulnerabilities A proven background in credit cards, payments, or financial transaction systems Understanding of modern application architectures (APIs, microservices, cloud platforms – likely Azure) Familiarity with OWASP More ❯

You’re walking into a mature environment: The company already has Secure SDLC and DevSecOps practices in place. This isn’t a ground-up build – it’s about stress-testing and strengthening what’s already built. You’ll have impact and visibility: Reporting to the CIO, with close collaboration with the Head of Information Security (compliance), you’ll shape … You’ll Be Doing: Actively identifying vulnerabilities in applications, especially around authentication flows, payments, and sensitive data handling Thinking creatively and adversarially – “breaking the app” to protect it Performing penetration testing, threat modelling, and secure code reviews Working directly with developers to integrate security best practices into an already-operational DevSecOps pipeline Advising on product and architectural design … culture that prioritises customer trust and system integrity What We’re Looking For: Deep hands-on experience in application security – not just theory, but experience in secure coding, manual testing, and fixing complex vulnerabilities A proven background in credit cards, payments, or financial transaction systems Understanding of modern application architectures (APIs, microservices, cloud platforms – likely Azure) Familiarity with OWASP More ❯

You’re walking into a mature environment: The company already has Secure SDLC and DevSecOps practices in place. This isn’t a ground-up build – it’s about stress-testing and strengthening what’s already built. You’ll have impact and visibility: Reporting to the CIO, with close collaboration with the Head of Information Security (compliance), you’ll shape … You’ll Be Doing: Actively identifying vulnerabilities in applications, especially around authentication flows, payments, and sensitive data handling Thinking creatively and adversarially – “breaking the app” to protect it Performing penetration testing, threat modelling, and secure code reviews Working directly with developers to integrate security best practices into an already-operational DevSecOps pipeline Advising on product and architectural design … culture that prioritises customer trust and system integrity What We’re Looking For: Deep hands-on experience in application security – not just theory, but experience in secure coding, manual testing, and fixing complex vulnerabilities A proven background in credit cards, payments, or financial transaction systems Understanding of modern application architectures (APIs, microservices, cloud platforms – likely Azure) Familiarity with OWASP More ❯

security frameworks across multiple businesses. What You’ll Do Develop and implement end-to-end security strategies for IoT platforms and internal systems. Conduct risk assessments, vulnerability scans, and penetration tests. Align infrastructure security with broader group-level frameworks. Embed security into development lifecycles (IaaS and PaaS). Provide training and guidance to internal teams on security best practices. … tools. What You Bring Strong background in IoT security and cloud infrastructure (especially Azure). Experience with cybersecurity frameworks (e.g., ISO 27001, NIST). Hands-on with security tools, penetration testing, and compliance. Excellent communication and collaboration skills. Certifications like CISSP, CEH, or AZ-500 are a plus. Why Join Be part of a mission-driven, global company More ❯

Lead, Cyber Security Lead, Information Security Consultant, Information Security Specialist, Security Subject Matter Expert, Senior Security Engineer, DevSecOps, CISSP, CISM, CEH, OSCP, GIAC, SABSA, SANS, TOGAF, SAFE, Scrum, Agile, penetration testing, Cloud We are Disability Confident and neurodiverse aware. If you have a disability, please tell us if there are any reasonable adjustments we can make to assist More ❯

Best Company To Work For in the UK, Tech and the South East in 2023. We are ISO27001 and ISO9001 Certified by UKAS. We are also a CREST approved penetration testing and SOC company, IASME Cyber Essentials Certification body and Cyber Essentials Plus certified. Find out more about our awards here: Why work for FSP? At FSP, we More ❯

/365 escalation team by providing cover for network related issues managed by a on-call rota (every other week) Proactive security focus and remediation of tasks highlighted by penetration testing. Cloud Operations Networ k Engineer - Requirements : Minimum of 5 years in a Network role A good level of understanding of Fortinet or Cisco Experience in maintaining a security More ❯

Senior Penetration Tester -240,000+ Total Package Entasis Partners are proud to be exclusively supporting a global organisation at the forefront of innovation in financial systems and high-performance computing. This is not your average security role. Our partner operates in a deeply technical, high-trust environment where the scale of data, the pace of experimentation, and the calibre … of internal talent make for an exceptionally challenging and rewarding opportunity. With a newly developed central London site focused on next-generation research, this firm is seeking a Senior Penetration Tester to strengthen its already world-class internal security capability. The Opportunity This is a hands-on, highly autonomous role embedded within a specialist cyber function. You’ll be … trusted to scope, execute, and deliver sophisticated penetration tests and control assessments across a range of technologies including Kubernetes, Jenkins, and Windows-based infrastructure. More than just finding issues, you’ll work in partnership with teams across the business to advise, remediate, and embed meaningful improvements. The environment is agile, collaborative, and engineered for depth not red tape. What More ❯

Cybersecurity Analyst - Pen Testing, Info Sec, Risk Up to £495 per day (Inside IR35) London/Hybrid (3 days per week onsite) 6 Months I am currently working with a leading insurance client who is looking to hire a Security Analyst to work on a new AI solution being implemented, so previous experience of Pen Testing and Information …/IT Security, with ability to perform risk assessments. Key Requirements: Demonstrable experience in Cyber Security A background in Pen Testing Good knowledge of Info Sec/IT Security Experience of conducting risk assessments within a Technology environment Knowledge of risk management frameworks (ISO 3100X/NIST 800-30/37/39, ENISA/EBIOS/OCTAVE/ More ❯

Wash Station Responsibilities: Working as part of a team to design, build, and deliver sustainable, scalable, reliable, and well-tested software into secure cloud infrastructure Advocating for and implementing testing best practices across all disciplines and promoting a quality/testable mindset within the team Creating a safe environment within the team where everyone shares the responsibility for quality … and testing from the outset Helping the team understand and estimate test efforts, test dependencies during planning and refinement sessions Pairing with Software Engineers during development and code review to ensure appropriate test coverage at different levels and to avoid any duplication of efforts Ensuring our automation test framework and coverage is targeted, relevant, efficient and resilient Develop tools … for integration, regression, load, performance, and security testing Working with the team to determine the root cause of issues, for example: using logs, and databases What do we have to offer? Competitive compensation, including a discretionary bonus based on business results; Great benefits like 25 leave days plus extra monthly "wellbeing days", a travel allowance and an attractive pension More ❯

Best Company To Work For in the UK, Tech and the South East in 2023. We are ISO27001 and ISO9001 Certified by UKAS. We are also a CREST approved penetration testing and SOC company, IASME Cyber Essentials Certification body and Cyber Essentials Plus certified. Find out more about our awards here: Why work for FSP? At FSP, we More ❯

data and broadcast services to global customers. In this role, you will: Own cloud operations across Azure and drive platform performance and cost optimisation Oversee security engineering, audits, pen testing, and compliance Lead change and incident management and support services (24/7) Manage end-user tech, corporate apps (e.g. ServiceNow, Salesforce), and software licensing Collaborate with exec leadership More ❯

Designing and evaluating complex systems for computer security Scope and execute security assessments and vulnerability research Perform in-depth security assessments using results from static and dynamic analysis Create testing tools to help engineering teams identify security-related weaknesses Collaborate with engineering teams to help them triage and fix security issues Mentor members of the team in computer and … s degree in Computer Science or related field (e.g. Electrical Engineering) 15+ years of relevant experience in one or more of the following areas: software/product security assessments, penetration testing, red teaming, web application assessments Interest in vulnerability research and exploit development – leading groups of 5 -10 engineers past experience required Understanding of operating systems, CPU instruction … iOS/Android) Reverse Engineering (e.g. IDA Pro/Ghidra/Frida) Fuzzing (e.g. Jazzer/AFL/Peach) Web Application assessment (e.g. Burp Suite Proxy, ZAP, REST API testing) Proven experience with security research including any published CVEs Experience developing proof of concept exploits bypassing modern exploit mitigations Active participant or organiser of Capture The Flag competitions Knowledge More ❯

Penetration Tester – Infrastructure Salary: £70,000–£100,000 (depending on experience) Location: Hybrid – 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, not web application focused, where you'll be expected to work independently and navigate challenging systems with confidence. This role is suited to testers who thrive in technically demanding scenarios, want autonomy, and are motivated by work with real-world impact. Key Responsibilities Conduct internal … infrastructure and Active Directory penetration tests in live production 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 More ❯