IT Security Engineer

How to use this kit

Ground every answer in facts on this page and the original listing. We never invent Glassdoor-style reviews or salaries that are not in our data.

Interview prep

• Security control assessment and KPIs
• Breach investigation and vulnerability analysis
• Network/system monitoring for intrusion
• Writing security policies and emergency procedures
• How security supports high-reliability trading systems

Fit summary

Strong fit if you want hands-on IT security in a quantitative trading firm’s London office—monitoring, vuln work, incident response, and standards—rather than remote-first product security at a consumer tech company.

Day in the role

As an IT Security Engineer at Jane Street in London, work typically tracks O*NET-style security engineering: monitoring systems for intrusion, coordinating vulnerability assessments, reviewing control effectiveness with metrics, investigating breaches, and helping document security and emergency procedures for a trading-tech environment.

Skills to emphasize

• freeCodeCamp — Full Stack curriculum (free)
• Saylor Academy — Computer Science courses (free)
• CS50 (Harvard, via edX) (free to learn)
• Microsoft Learn — developer training paths (free to learn)

FAQ from this listing

Is this role remote?

No. The listing marks remote as 0; expect London-based work.

What does an IT Security Engineer focus on here?

Per occupation data: assess controls, investigate breaches, monitor for intrusions, run vulnerability analysis, and document security practices.

Where can I study related foundations for free?

Listed options include freeCodeCamp and Saylor (free), plus CS50 and Microsoft Learn (free to learn).

Occupation tasks (O*NET)

Public-domain labor data — prepare examples for 2–3 of these.

• Assess the quality of security controls, using performance indicators.
• Conduct investigations of information security breaches to identify vulnerabilities and evaluate the damage.
• Coordinate documentation of computer security or emergency measure policies, procedures, or tests.
• Coordinate monitoring of networks or systems for security breaches or intrusions.
• Coordinate vulnerability assessments or analysis of information security systems.
• Develop information security standards and best practices.
• Develop or implement software tools to assist in the detection, prevention, and analysis of security threats.
• Develop or install software, such as firewalls and data encryption programs, to protect sensitive information.

O*NET source

Company facts (cached)

Website: janestreet.com

Public cache only — not an employee review.

Role overview (listing rewrite)

IT Security Engineer at Janestreet in London Position Summary We are seeking a highly skilled Infrastructure Security Engineer with extensive experience in Windows engineering and modern platform security controls to join our global team. This role requires strong judgment and the ability to prioritize complex remediation efforts, focusing on technical advice and decision-making for strategic security initiatives. Key Responsibilities Proactively propose, design, test, implement, and document strategic security controls across IT platforms. Coordinate and deliver security solutions while identifying opportunities to automate intelligent workflows. Secure internal IT and remote working platforms through hands-on technical work, consultancy, and security influence within the IT team. Build scalable security controls, investigate emerging threats, develop new security tooling, and drive vulnerability management initiatives. Requirements Strong Windows engineering background with practical exposure to modern platform security controls. Experience in writing code and automation (e.g., PowerShell modules, Python) and integrating security products via APIs. Ability to prioritize complex remediation efforts and make strategic decisions for the group. Proven experience in building scalable security controls and driving vulnerability management initiatives. More About Janestreet Janestreet is a highly dedicated team of engineers who monitor and manage our environment across a physical/virtual computing landscape spanning three continents. Your analytical thinking and expertise will be invaluable as we support the daily work of our colleagues and keep our systems secure. How to Apply To apply, complete your application directly on this page, or you'll be redirected to the employer's application platform to finish submitting there.

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Questions to ask them

• What does success look like in the first 90 days for this role?
• How is the team structured, and who would I work with most?
• What tools and systems does this role use daily?
• Is the work primarily based in London, hybrid, or fully remote?