Penetration Tester

employment and/or education history for up to three years. Some vacancies may require full Security Clearance which can require further evidence to be provided. For further details of the evidence required to apply for Baseline and Security Clearance please refer to the Defence Business Services National Security Vetting (DBS NSV) Agency.At Thales we provide CAREERS and not only jobs. With Thales employing 80,000 employees in 68 countries our mobility policy enables thousands of employees each year to develop their careers at home and abroad, in their existing areas of expertise or by branching out into new fields. Together we believe that embracing flexibility is a smarter way of working.Thales UK is committed to providing an inclusive and barrier-free recruitment process. We will provide reasonable adjustments and support to ensure neuro-diverse applicants or those with a disability or long-term condition can be their best during the recruitment process. To request an adjustment, if you need this job advert in an alternative format or if you have any questions about the recruitment process, please contact Resourcing Ops for mid to senior roles, or the Early Careers Team for graduate and apprentice roles.Great journeys start here, apply now!#J-18808-Ljbffr Similar jobs, A pioneering digital bank in the UK is seeking an experienced Penetration Tester to join its team in London. You will work closely with cyber security professionals to protect customers and enhance security across the organization. Responsibilities include conducting...

most critical challenges.EssentialDegree in Computing, Cybersecurity, or a related field - or equivalent professional experience in lieu of formal tertiary studiesCHECK Team Leader accreditation currently heldDemonstrated track record as a Penetration Tester, Red Team Operator, or equivalent offensive security specialistProven ability to manage small technical teams, demonstrating strong people skills, mentorship, and collaborative leadershipDeep expertise in network protocols, application security, operating systems, and cloud platforms across both IT and OT environmentsHands-on proficiency with industry-standard tools including Burp Suite, Metasploit, Cobalt Strike, Nmap, Nessus, plus custom scripting in Python, PowerShell, and BashProven experience conducting penetration tests across diverse systems: Windows, Linux, Android, iOS, Web Applications, and Cloud infrastructuresFamiliarity with defence and government environments, including secure handling of classified informationExceptional written and verbal communication skills, able to translate complex technical findings into clear, actionable insightsSC or DV clearance (mandatory for project delivery), with eligibility or current holdingDesirableRecognised certifications such as CREST (CPSA, CRT, CCT INF, CCT APP, CCRTS, CCRTM), CHECK Team Member/Leader, OSCP, OSCE3, CEH, or GIAC (GPEN, GWAPT, GRTP, GXPN)Exposure to IC/S/SCADA, RF systems, or military-grade communication networksStrong grasp of Threat Intelligence, MITRE ATT&CK framework, and adversary emulation techniquesPrevious involvement in projects supporting the MOD, defence primes, or critical national infrastructure (CNI)Domain expertise across Defence, Nuclear, Government, Aerospace, CNI, and Transport sectorsStep into a role where your expertise makes a national impact - join us today!UKEO (UK Eyes Only) Due to the nature of the work that we do at Thales, many of our roles are subject to security restrictions., Job Description Penetration Tester Location: Remote Based I am working on an exciting opportunity to join a growing boutique organisation. Previous experience within Security Testing is a bonus You should be able to demonstrate the following: *Mobile Apps Pen Testing -..., Job Title: Penetration Tester (CHECK Team Member) Location: UK (Hybrid / Remote) Experience: 1-3 years Eligibility: UK National (must be eligible for security clearance) About the Role: We're looking for a Penetration Tester (CHECK Team Member) to join our growing...

and well-being matters to us and that is why we offer you the flexibility to do what's important to you; whether that's part-time hours, job sharing, home working, or the ability to flex your start and finish times. Where possible, we support a working pattern that suits your lifestyle and helps you reach your ambitions.What the role has to offerSafeguard UK Defence systems through advanced penetration testing and red teaming on critical military platformsTackle complex threat simulations and exploit development across IT, OT, cloud, and embedded environmentsUse cutting-edge tools with funded training and certifications (CHECK, CREST, OSCP, GIAC)A developmental role where you'll put your own stamp on future capabilityOur Opportunity We are seeking a security-cleared Penetration Tester to join our dynamic Cyber Security team, working at the forefront of UK Defence and national security. In this role, you'll take on advanced security testing, vulnerability assessments, and red team exercises across both classified and unclassified environments-directly strengthening the resilience of mission-critical networks and applications.This position offers the opportunity to apply your expertise in offensive security methodologies, secure system design, and the unique challenges of defence environments. While prior defence experience is highly valued, we also welcome applications from seasoned red team specialists and offensive security professionals from sectors such as utilities, nuclear, and automotive, who bring transferable skills and fresh perspectives to our mission.What we offer youAnnual bonus (VCP)Pension - match like-for-like up to 7% of annual base salaryLife Assurance - 2 × base salary minimum (8 × salary if part of the pension scheme)Income Protection - 50% of salary less state benefits for 5 yearsAnnual Leave - 201 hours, bank holidays, plus 1 company dayPrivate Medical Insurance - Couples coverHalf day every Friday, usually finishing around 1:00 pm24/7 Employee Assistance Programme24 hours paid leave for volunteering activitiesAccess to flexible benefits and discounts - dental insurance, buying & selling annual leave, cycle to work, and many moreKey Responsibilities and TasksLead end-to-end penetration testing across networks, applications, cloud infrastructures, and embedded systems-delivering actionable insights that strengthen mission-critical environmentsDrive advanced vulnerability assessments and exploit development, executing post-exploitation activities within authorised scopes to uncover hidden risks and resilience gapsOrchestrate red and purple team engagements, simulating sophisticated threat scenarios against defence systems to rigorously test and enhance security postureProduce high-impact technical reports and executive briefings, translating complex findings into clear risk narratives, business impact assessments, and prioritised remediation strategiesPartner with defensive operations, Job Description Penetration Tester (CHECK Team Member) Location: London (Hybrid, 2-3 days onsite per week) Salary: Up to £65,000 (depending on experience) + benefits NOTE: Candidates must be be eligible for UK Security Clearance (SC) This is an opportunity to join a...

Cybersecurity Penetration Tester Location: Remote UK, United Kingdom. Thales people architect identity management and data protection solutions at the heart of digital security. Business and governments rely on us to bring trust to the billions of digital interactions they have with people. Our technologies and services help banks exchange funds, people cross borders, energy become smarter and much more. More than 30,000 organizations already rely on us to verify the identities of people and things, grant access to digital services, analyze vast quantities of information and encrypt data to make the connected world more secure.Together we offer fantastic opportunities for committed employees to learn and develop their career with us. At Thales UK, we research, develop, and supply technology and services that impact the lives of millions of people each day to make life better, and keep us safer. We innovate across the major industries of Aerospace, Defence, Security and Space. Your health, This role requires you to be a UK National and achieve Security Clearance (SC) without any caveats. It would be advantageous if currently held, however, if not currently held, it is a requirement that the successful applicant undergo, achieve, and maintain SC Clearance prior to commencing employment. If approved by the MOD, a dual national from a non-ITAR country may be considered.Please visit the UKSV website for further guidance: https://www.gov.uk/government/publications/united-kingdom-security-vetting-clearance-levels/national-security-vetting-clearance-levels.To be eligible for full SC, you generally need to have resided in the UK for the last five years. In some circumstances, a minimum of three years' residence in the UK over the last five years may be accepted, with additional overseas checks.#LI-VG1In line with Thales' Baseline Security requirements, candidates will be asked to provide evidence of identity, eligibility to work in the UK and, A major financial services provider in Greater London is seeking a Senior Penetration Tester to join their internal offensive security team. This role involves conducting in-depth penetration tests across various systems and applications, owning engagements end-to-end, and..., ReRoot Cyber is seeking highly skilled and forward-thinking CHECK Team Members to join one of the UK's most respected testing teams. This is an independent, privately owned testing consultancy led by industry-recognised names who are hackers at heart. This team is led by...