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Cybersecurity Engineer - Threat Modelling

Janestreet · London

On-sitePosted 22 Sept 2026

What this role requires

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Also mentioned, not required: English. Worth having, but their absence is not what gets a CV filtered out.

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Job description

About the Position

We're looking for a hands-on Cybersecurity Engineer to join our Cybersecurity team to strengthen the security posture of our applications, data, infrastructure, and processes.

The role combines both hands-on technical expertise to uncover and remediate vulnerabilities and people skills to partner with various teams across the firm, guide teams to analyze the security implications of design decisions and guide them to build security into their applications from the ground up.

The role will leverage your hands-on offensive background to identify threats and require you to dive deep into the technical details and help build tailored security solutions and develop creative approaches to complex challenges. This role will require practical threat modeling skills and the ability to translate security principles into concrete architectural improvements.

The role also involves having conversations with system owners who understand their applications but may not recognize potential exploits, partnering with them to identify and help resolve vulnerabilities, and balancing tradeoffs between security controls and business requirements.

As a member of the Cybersecurity team, you’ll join a skilled group of programmers and security experts dedicated to keeping the firm safe. Our work covers a wide range of topics, from software engineering and DevOps to risk analysis, security governance, and cyber awareness.

Read the full description (12 more sections)

About You

Offensive security background

Can help build and implement secure solutions from the ground up

Equally comfortable breaking down complex problems on a whiteboard and taking a hands-on approach to problem-solving and troubleshooting

Skilled at evaluating security tradeoffs and making risk-based decisions

An excellent communicator who thrives on talking to people and building relationships; a collaborative mindset is a must

Ability to teach others and transfer knowledge about threat modeling 

Strong Linux background — you know your way around a terminal and are confident in your scripting ability

Comfortable taking accountability and able to document your decision-making rationale

Proficiency in any programming language is a plus

Fluency in English required

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