IT Security Specialist
London, England · London · 5+ years experience · Posted Oct 5, 2026
At a glance
- Experience
- 5+ years experience
- Location
- London, England · London
About the role
- Jane Street is looking for an IT Security Specialist with a Windows security focus to join their IT Security team in London.
- The role involves securing Windows and macOS computing platforms through hands-on technical work, cross-team collaboration, and creative problem-solving.
Responsibilities
- Deploying, documenting and supporting security controls at scale
- Acting as a key contributor to the vulnerability management programme, ensuring vulnerabilities are rigorously detected and mitigated
- Providing security guidance and support to the broader IT department as well as the 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 the team’s operational playbooks, procedures, guidelines and technical security standards
Requirements
- 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
- Solidly understand common attack scenarios targeting the Windows platform, as well as 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 to identify production disruptions
- Have 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
- 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
Preferred qualifications
- Knowledge of macOS and mobile device security fundamentals
- Worked in a code-driven environment
- Hands-on experience with security incident response
Skills
- Windows
- macOS
- Active Directory
- Group Policy
- PowerShell
- EDR
- Anti-malware
- Application Control
- Host-based Firewalls
- Disk Encryption
