Security Engineer

G-Research; Greater London; On-site; GBP 100,000 - GBP 125,000; Full time

Job summary

A quantitative finance firm in London seeks a Security Engineer to embed within delivery teams and tackle security challenges in production systems. This role requires strong experience in software systems, a thorough understanding of security concepts, and the ability to communicate effectively with technical teams. Ideal candidates should be adept at delivering production code and fixing security issues, contributing to a robust security framework within the organization. Competitive compensation and benefits offered.

Benefits

Highly competitive compensation

Annual discretionary bonus

Lunch provided

30 days’ annual leave

9% pension contributions

Informal dress code

Comprehensive healthcare

Cycle-to-work scheme

Monthly company events

Qualifications

• Strong experience delivering production code in complex software systems.
• Deep understanding of security concepts and common failure modes.
• Ability to learn unfamiliar technology stacks quickly.
• Experience fixing security issues in existing systems.
• Good engineering judgement balancing security with performance.

Responsibilities

• Embed with teams to design and implement security fixes.
• Learn and contribute to existing systems and processes.
• Write high-quality code addressing security issues effectively.
• Own security work from investigation through delivery.
• Identify patterns in security issues and propose improvements.

Skills

Security expertise

Production code delivery

Communication skills

Technical reasoning

Collaboration

Job description

We tackle the most complex problems in quantitative finance, by bringing scientific clarity to financial complexity.

From our London HQ, we unite world-class researchers and engineers in an environment that values deep exploration and methodical execution - because the best ideas take time to evolve. Together we’re building a world-class platform to amplify our teams’ most powerful ideas.

Security is foundational to this mission and must be delivered in a way that supports how our engineering teams build and operate complex systems at scale.

Take the next step in your career.

The role

Our engineering teams build and operate platforms and products that underpin research, modelling and client trading. These systems are performance-critical, highly available and continuously evolving.

Security issues are identified through testing, audit, operational learning and threat intelligence. Addressing them effectively requires engineers who can work directly within product and platform teams, understand systems in depth and deliver fixes as part of normal development workflows.

The embedded Security Engineering team exists to make that happen. As a Security Engineer in the team, you will embed within delivery teams, learn their codebases and architectures and take responsibility for designing and implementing robust security fixes in production systems. This includes writing production-quality code, participating fully in planning and delivery and ensuring solutions align with performance and reliability requirements.

Beyond fixing individual issues, you will help identify recurring patterns, drive improvements that reduce systemic risk and leave teams better equipped to build and operate secure systems over time.

This role carries significant responsibility and autonomy, requiring sound technical judgement and the ability to work effectively in a collaborative, consensus-driven engineering environment.

Key responsibilities of the role include:

• Embedding with product or platform teams to design and implement fixes for identified security issues
• Learning unfamiliar systems and codebases quickly, contributing effectively to existing delivery processes
• Writing high-quality, maintainable code that addresses security issues without introducing unnecessary complexity or performance regression
• Owning security work from investigation through to delivery and follow-up
• Ensuring fixes are understood, tested and safely deployed
• Identifying patterns in security issues and contributing to broader improvements where appropriate
• Collaborating with experienced engineers to reach well-reasoned solutions, incorporating feedback and differing perspectives
• Communicating clearly about issues, solutions and trade-offs with engineers and stakeholders
• Acting as a role model for pragmatic, delivery-focused security engineering

Who are we looking for?

We are looking for engineers with deep security expertise who are comfortable working inside complex systems and delivering real outcomes, particularly in environments where decisions are shaped through technical discussion and collaboration.>

The ideal candidate will have the following skills and experience:

• Strong experience delivering production code in complex software systems
• Deep understanding of security concepts and common failure modes in modern infrastructure and applications
• A proven ability to learn unfamiliar technology stacks quickly and work effectively within them
• Experience fixing security issues in existing systems, rather than only identifying or advising on them
• Good engineering judgement, including the ability to balance security, performance, reliability and delivery constraints
• A proven ability to work productively with other deeply technical engineers, contributing to decisions through reasoning, evidence and delivery
• Clear communication skills and a pragmatic, collaborative mindset

Why join us?

• Highly competitive compensation plus annual discretionary bonus
• Lunch provided (via Just Eat for Business) and dedicated barista bar
• 30 days’ annual leave
• 9% company pension contributions
• Informal dress code and excellent work/life balance
• Comprehensive healthcare and life assurance
• Cycle-to-work scheme
• Monthly company events