Infrastructure Security Engineer

Jane Street; City Of London; On-site; GBP 90,000 - 130,000; Full time

Job summary

Jane Street seeks an Infrastructure Security Engineer to strengthen cross‑platform security across its IT stack. You will design, test and automate security controls and deliver tooling via PowerShell and Python while integrating security products through APIs.

You’ll work hands‑on and provide technical guidance to secure internal IT and remote platforms, drive vulnerability management, and partner with IT Engineering to scale security across three continents.

Qualifications

• Proficient in securing Windows OS platforms and resolving complex technical issues.
• Hands-on experience with integrated security technologies for safeguarding Windows OS.
• Administer endpoint security and vulnerability management solutions.
• Knowledgeable about OS hardening and PAM.
• Understand common threat tactics, techniques and countermeasures.
• Experience with Windows core infra services (AD/EntraID, PKI).
• Aims to automate scalable security practices.
• Familiar with security tooling and APIs.
• Fluent in English.

Responsibilities

• Design, test, implement and document strategic security controls across IT platforms.
• Coordinate security solutions and automate intelligent workflows.
• Secure internal IT and remote working platforms through hands‑on work and consultancy.
• Develop new security tooling and drive vulnerability management initiatives.
• Collaborate with IT Engineering across a global landscape.

Skills

Windows security

Endpoint security

Automation

Scripting (PowerShell, Python)

Threat TTPs awareness

OS hardening

Privileged access management

Security tooling & APIs

Tools

PowerShell

Python

EDR

Vulnerability scanners

APIs

Job description

About the Position

We are looking for an Infrastructure Security Engineer with a strong cross platform engineering background and practical exposure to modern platform security controls to help our global team secure Jane Street's IT platforms. In this role, you'll need strong judgement and discerning taste to prioritise potentially complex and extensive remediation efforts. You'll help decide where we focus our resources, providing technical advice and making decisions on behalf of the group where needed. We're looking for builders: people who spend their time writing code and automation (e.g. PowerShell modules, Python) and integrating security products via their APIs, rather than primarily configuring and operating the tools themselves.

In this role, you will proactively propose, design, test, implement and document strategic security controls. You will coordinate and deliver security solutions across our IT platforms while identifying opportunities to further automate intelligent workflows. You will help secure internal IT and remote working platforms through a combination of hands‑on technical work, consultancy and security influence to the wider IT team. This role will encompass a range of responsibilities, including building security controls that scale, investigating emerging threats, developing new security tooling and driving vulnerability management initiatives.

This position sits within our IT Engineering group, a highly dedicated team of engineers who monitor and manage our environment across a physical/virtual computing landscape that spans three continents. Your analytical thinking and expertise will be invaluable as we support the daily work of our colleagues and keep our systems operating at the highest standard.

About You

• Proficient in securing Windows OS platforms and resolving complex technical issues in a fast-moving environment
• Have hands-on experience utilising integrated security technologies for safeguarding Windows operating systems, including application control, host-based firewalls, auditing and event monitoring and disk encryption
• Skilled in administering endpoint security and vulnerability management solutions, including antivirus, anti-malware, EDR, vulnerability scanning and patch management
• Knowledgeable about security best practices, including operating system hardening, privileged access management and vulnerability mitigation
• Understand common threat tactics, techniques and procedures (TTPs) and effective countermeasures
• Well-versed in Windows core infrastructure services (AD/EntraID, PKI)
• Eager to produce scalable and repeatable security practices through automation
• Understand security tooling and APIs
• Flexible, reliable and highly collaborative
• Proven experience automating workflows in PowerShell or other scripting languages
• Fluent in English