{"id":774858,"url":"https://alion.io/job/g-research-penetration-tester","title":"Penetration Tester","company":{"id":445185,"name":"G-Research","domain":"gresearch.com","url":"https://alion.io/company/g-research","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"A","score":94,"open_postings":58,"ghost_share":0.017,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":97,"computed_at":"2026-11-09T06:03:00Z"}},"role":"Security","role_family":"Security","seniority":null,"employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":65000,"max_usd":147000,"period":"year","method":"role_country_seniority_unknown","sample_n":159},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Ansible","optional":false},{"name":"Jenkins","optional":false},{"name":"Kubernetes","optional":false},{"name":"Python","optional":false},{"name":"Windows","optional":false}],"status":"live","first_seen_at":"2026-07-22T00:00:00Z","employer_posted_date":"2026-07-22","last_verified_at":"2026-11-09T14:10:58Z","board_verified":true,"closed_at":null,"days_open":110,"trust":{"level":"ok","repost_count":0,"flags":["company_stale"],"days_open":110},"description":"We tackle the most complex problems in quantitative finance, by bringing scientific clarity to financial complexity.\nFrom our London HQ, we unite world-class researchers and engineers in an environment that values deep exploration and methodical execution - because the best ideas take time to evolve. Together we’re building a world-class platform to amplify our teams’ most powerful ideas.\nSecurity is foundational to this mission and must be delivered in a way that supports how our engineering teams build and operate complex systems at scale.\nTake the next step in your career.\nThe role\nAs a Penetration Tester, you will lead and conduct penetration tests and vulnerability assessments across a wide range of internal systems and security controls. Your work will directly strengthen our overall security posture through continuous testing, actionable insights and collaboration on remediation strategies.\nKey responsibilities of the role include:\nPerforming in-depth penetration testing across a variety of technologies, including Kubernetes, Jenkins and Windows Domain Services\nDelivering practical, impactful remediation advice to Control Owners based on identified vulnerabilities\nSupporting business and application owners in assessing and improving the effectiveness of their security controls\nProviding technical consulting and assurance to Risk, Compliance and Detection Engineering teams, including control assessments and configuration reviews\nMaintaining and enhancing the team’s operational tooling, automation and system integrations\nMentoring and supporting less experienced team members, fostering knowledge sharing and growth\nWho are we looking for?\nThe ideal candidate will have the following skills and experience:\nProven expertise across the full penetration testing lifecycle, from scoping and execution to reporting and stakeholder debriefs\nDeep understanding of vulnerability assessment practices, including effective remediation strategies for both infrastructure and application-level security\nStrong background in technical security roles across diverse environments; familiarity with DevOps technologies\nExperience validating the effectiveness of security controls through both manual and automated approaches\nEngineering experience, particularly in building automation and tooling to streamline team output\nProficiency in development and scripting tools commonly used in DevSecOps, including Python, Jenkins and Ansible.\nRelevant security certifications with OSCP required and CRT or OSEP desirable\nStrong communication and interpersonal skills, with an emphasis on clear and concise written output\nWhy join us?\nHighly competitive compensation plus annual discretionary bonus\nLunch provided via Just Eat for Business and dedicated barista bar\n35 days’ annual leave\n9% company pension contributions\nInformal dress code and excellent work-life balance\nComprehensive healthcare and life assurance\nCycle-to-work scheme\nMonthly company events\nG-Research is committed to cultivating and preserving an inclusive work environment. 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