Embedded Security Engineer | Quant Finance Research Firm

[Up to c. £225k Comp Package | Hybrid Working]

Role Overview

We’re representing a highly technical quantitative research and trading organisation operating at serious scale across compute, data and distributed systems. Security is treated as an engineering discipline - not a compliance function - and must integrate seamlessly into how platforms are designed, built and evolved. This role sits within an embedded security engineering function that works directly inside product and platform teams. Rather than producing reports or external recommendations, you’ll join delivery cycles, understand production code in depth, and implement robust, performance-aware security improvements directly into live systems. It’s a hands-on engineering role for someone who wants ownership, autonomy and real technical impact...

Key Responsibilities

• Integrate directly into product or infrastructure teams to address identified security weaknesses in production systems
• Rapidly gain context on unfamiliar architectures, services and codebases
• Design and implement durable security remediations that align with existing engineering standards
• Deliver production-quality code that preserves system performance and reliability
• Own security-related changes from investigation through deployment and validation
• Ensure fixes are thoroughly tested and safely introduced into critical systems
• Identify recurring vulnerability patterns and propose structural improvements
• Collaborate closely with senior engineers to debate design trade-offs and reach technically sound outcomes
• Contribute to improving long-term secure development practices within teams
• Act as a pragmatic voice on balancing risk reduction with delivery velocity

What You’ll Bring...

• 5-10 years’ experience in software engineering, security engineering or a closely related discipline within complex production environments
• Strong background writing and shipping high-quality production code (language-agnostic; depth more important than stack)
• Demonstrable experience remediating security issues within existing systems - not just identifying them
• Deep understanding of application and infrastructure security concepts, including common design flaws and attack paths
• Ability to reason about trade-offs across security, performance, reliability and maintainability
• Proven ability to navigate large, unfamiliar systems and become effective quickly
• Experience operating in collaborative, engineering-led environments where decisions are shaped through technical discussion
• Clear and concise communication style with the confidence to defend design decisions through reasoning
• A pragmatic, outcome-focused mindset - focused on improving real systems rather than theoretical perfection

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