IT Security Specialist

AI in this role

Secure Windows and macOS computing platforms through security controls, vulnerability management, and incident response.

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security-engineeringvulnerability-managementincident-responseendpoint-securityscripting

About the position

We 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:

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

We’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.

About you

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
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
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

If you're a recruiting agency and want to partner with us, please reach out to agency-partnerships@janestreet.com

How we rate this

IT Security Specialist at Jane Street rates 0 out of 100 for how much of the daily work is AI. That makes it Little AI (AI Level 1 of 4). The level is about AI in the job, not seniority.

Classification

Little AI. AI is not part of the work.

●●●● Builds AI80 to 100
●●●○ Works on AI60 to 79
●●○○ Uses AI40 to 59
●○○○ Little AI0 to 39

Levels come from how often the tools, models and workflows of the role are named in the posting itself. Open the description and count.

Key facts

IT Security Specialist is an open job at Jane Street.
Level rates this role AI Level 1 of 4: Little AI.
The role is based in London, England, United Kingdom.
The job was posted on October 5, 2026.
Seniority: mid.
Applications are handled by Jane Street. Apply on Jane Street

Prepare for this job

A free preview built only from this posting: what it asks for, what you could be asked in an interview, and how to adjust your resume.

Skills and AI tools this role asks for

Security EngineeringVulnerability ManagementIncident ResponseEndpoint SecurityScriptingWindowsMacosPowershell

Questions you could be asked

Tell me about a project where security engineering was part of your work. What did you do?
Tell me about a project where vulnerability management was part of your work. What did you do?
Tell me about a project where incident response was part of your work. What did you do?
Tell me about a project where endpoint security was part of your work. What did you do?
Tell me about a project where scripting was part of your work. What did you do?

Adapt your resume

List these exact terms on your resume: Security Engineering, Vulnerability Management, Incident Response, Endpoint Security, and Scripting. An applicant tracking system matches the wording, not the idea.
Attach one line of real, concrete experience to at least one of them — a tool named with nothing behind it rarely survives a human read.

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