← All roles

IT Security Specialist

Jane Street· Technology
Apply on company site
LondonFull-timePosted 2w ago

About the role

Enthusiastic security professional with a Windows security focus to secure Jane Street's Windows and macOS computing platforms, contributing through hands-on work, cross-team collaboration and problem-solving.

Responsibilities

  • Deploying, documenting and supporting our security controls at scale
  • Acting as a key contributor to our vulnerability management programme, ensuring vulnerabilities are rigorously detected and mitigated
  • Providing security guidance and support to the broader IT department as well as our IT Operations Team as security incidents arise
  • Developing both technical and non-technical solutions in collaboration with engineering teams that address security concerns
  • Contributing to the development of our team’s operational playbooks, procedures, guidelines and technical security standards

Qualifications

  • Have 5+ years of experience as a security or operations engineer, with a technical background rooted in Windows
  • Experienced with maintaining, supporting and administering Windows platforms at scale, including Active Directory and Group Policy
  • Solid understanding of common attack scenarios targeting Windows and the protection technologies designed to mitigate them
  • Strong troubleshooter, comfortable triaging security incidents and production issues; familiar with trend and log analysis, with hands-on experience using system monitoring and alerting tools
  • Hands-on experience deploying and implementing endpoint security controls at scale (anti-malware, EDR, application control, log aggregation, host-based firewalls, disk encryption, etc.)
  • Comfortable with PowerShell, including experience scripting or building tooling to automate security tasks
  • Knowledge of macOS and mobile device security fundamentals is a plus
  • Excellent written and verbal communicator; able to explain processes clearly to colleagues across the firm
  • Comfortable working in an environment with shifting priorities
  • Collaborative and approachable; eager to be a team player
  • Fluent in English

Skills

Required:Security/Operations engineeringWindows platform administrationThreat and vulnerability managementIncident response and triageEndpoint security controlsPowerShellCommunicationTeam collaborationEnglish fluency
Nice to have:macOS/mobile security
Last updated Oct 25, 2026. Interested? Apply on the company site.

About Jane Street

SIX

Jane Street is a quantitative trading firm and liquidity provider with a unique focus on technology and collaborative problem solving.

Machine learningquantitative tradingtechnologyresearch-drivenglobal marketsinternshipseventsprograms
Company profileWebsite

More open roles at Jane Street