Software Engineer in City of Westminster

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. Protecting the firm’s most valuable intellectual property is central to this mission. Our research output – the source code, compiled binaries and research documents that embody our competitive edge – demands purpose‑built security controls that go beyond off‑the‑shelf solutions.

The Core IP Security team designs, builds and operates the bespoke security systems that protect the firm’s most sensitive intellectual property across its full lifecycle from research through to production systems. Our systems are purpose‑built for highly sensitive environments and include cryptographic key management, encrypted source‑code and document hosting, access control and approval workflows, classification and risk‑reporting, and detection and scanning tools.

As a Software Engineer in the team, you will take ownership of designing, developing and operating these systems across service backends, cryptographic libraries, API integrations and hardened infrastructure. The software you build must meet the highest standards of correctness, auditability and availability. You will work on both new capabilities and improvements to existing systems, partnering closely with research stakeholders to deliver effective security controls that support workflows without creating unnecessary friction. This is a hands‑on role with significant autonomy in a small, focused team where every engineer has meaningful impact.

Key responsibilities of the role include:

• Designing and implementing high‑assurance security systems to protect sensitive and valuable intellectual property
• Developing and maintaining cryptographic key management services, access‑control policies and shared security libraries
• Building and evolving access‑control, classification and risk‑reporting systems to support governance and auditability
• Developing APIs and integrations that embed security controls into the wider engineering platform
• Contributing to detection and scanning capabilities to identify protected assets and validate controls
• Operating and hardening security‑critical infrastructure, including physical server environments with dual‑control operational procedures
• Participating in disaster recovery planning, testing and execution for critical security systems
• Working directly with research stakeholders to understand their needs and deliver security controls with minimal operational friction
• Identifying opportunities to simplify, replace or rebuild existing systems when better approaches are available

Who are we looking for?

We are looking for an engineer who combines strong software development skills with an interest in security, cryptography and high‑integrity systems. You should be comfortable working across the full stack, from service backends and APIs to cryptographic libraries and infrastructure automation in a collaborative, fast‑moving environment.

The ideal candidate will have the following skills and experience:

Essential:

• Strong experience delivering production‑quality software in a statically typed language, ideally C#/.NET
• Strong understanding of software architecture, concurrency, distributed systems and API design
• Experience building or operating security‑sensitive systems where correctness and auditability are critical
• Ability to quickly learn unfamiliar systems and contribute effectively
• Sound engineering judgement, balancing security, performance, reliability and delivery
• Clear communication skills and a collaborative, pragmatic mindset
• Experience working with modern development practices, including CI/CD, code review and automated testing

Highly desirable:

• Experience with cryptography, key management or security‑sensitive infrastructure
• Experience with high‑integrity or hardened environments and operational controls
• Experience developing security libraries, SDKs or shared engineering components
• Familiarity with access‑control systems, identity management or approval workflow engines
• Strong Linux and infrastructure automation experience
• Experience with Kubernetes, infrastructure as code and observability tooling
• Full‑stack development experience for internal tools and dashboards

Nice to have:

• Experience with additional languages such as Python, TypeScript, Go or Rust
• Exposure to threat modelling, remediation or security architecture reviews
• Experience in regulated or security‑conscious environments
• Familiarity with Git internals, self‑hosted Git platforms or source‑code management security

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