{"id":2432456,"url":"https://alion.io/job/jane-street-it-security-specialist","title":"IT Security Specialist","company":{"id":7349,"name":"Jane Street","domain":"janestreet.com","url":"https://alion.io/company/jane-street","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":76,"open_postings":173,"ghost_share":0.318,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":162,"computed_at":"2026-10-14T06:34:16Z"}},"role":"Support","role_family":"Support","seniority":"senior","employment_type":null,"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":49000,"max_usd":95000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":8},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Active Directory","optional":false},{"name":"PowerShell","optional":false},{"name":"Windows","optional":false}],"status":"live","first_seen_at":"2026-10-05T09:08:58Z","employer_posted_date":"2026-10-05","last_verified_at":"2026-10-14T21:36:47Z","board_verified":true,"closed_at":null,"days_open":9,"trust":{"level":"ok","repost_count":0,"flags":["company_stale"],"days_open":8},"description":"About the position\nWe are looking for an enthusiastic, motivated and technologically curious individual with a Windows security focus to join Jane Street's IT Security team. Our team is dedicated to securing the firm's Windows and macOS computing platforms, which you will contribute to through a combination of technical hands-on work, cross-team collaboration and creative problem-solving. Responsibilities of this role will include: \nDeploying, documenting and supporting our security controls at scale\nActing as a key contributor to our vulnerability management programme, ensuring vulnerabilities are rigorously detected and mitigated\nProviding security guidance and support to the broader IT department as well as our IT Operations Team as security incidents arise\nDeveloping both technical and non-technical solutions in collaboration with engineering teams that address security concerns\nContributing to the development of our team’s operational playbooks, procedures, guidelines and technical security standards\nWe’re looking for someone who fully enjoys working with and being around people, takes pleasure in triaging complex problems and is able to delegate and escalate tasks effectively. This role is anything but siloed; we’ll rely on you to be a key liaison between the IT Security team and other internal technology groups to distill and communicate pertinent information. While we’re open to individuals from a range of backgrounds, someone who’s worked in a code-driven environment and has hands-on experience with security incident response is preferred. \nAbout you\nHave 5+ years of experience as a security or operations engineer, with a technical background rooted in Windows\nExperienced with maintaining, supporting and administering Windows platforms at scale, including Active Directory and Group Policy\nSolidly understand common attack scenarios targeting the Windows platform, as well as the protection technologies designed to mitigate them\nStrong troubleshooter, comfortable triaging security incidents and production issues; familiar with trend and log analysis, with hands-on experience using system monitoring and alerting tools to identify production disruptions\nHave hands-on experience deploying and implementing endpoint security controls at scale (anti-malware, EDR, application control, log aggregation, host-based firewalls, disk encryption, etc.)\nComfortable with PowerShell, including experience scripting or building tooling to automate security tasks\nKnowledge of macOS and mobile device security fundamentals is a plus\nExcellent written and verbal communicator; able to explain processes clearly to colleagues across the firm\nComfortable working in an environment with shifting priorities\nCollaborative and approachable; eager to be a team player\nFluent in English\nIf you're a recruiting agency and want to partner with us, please reach out to ","description_format":"text","description_chars":2922,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"English","level":"Advanced (C1)","optional":false}]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Hedge Funds & Alternative Investments"],"lifecycle":[{"event":"open","at":"2026-10-13T09:42:58Z"}],"visa":[{"country":"GB","licensed_sponsor":true,"evidence":"Licensed UK visa sponsor (Senior or Specialist Worker, Skilled Worker)","filings_12m":null,"filings_prev_12m":null,"green_card_filings_12m":null,"median_offered_wage_usd":null,"route":"Global Business Mobility: Senior or Specialist Worker; 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