Senior Software Engineer in London

The Client

Our client is a globally recognised investment firm where engineering is treated as a strategic advantage. Their equity platform is powered by a proprietary technology stack built in-house and used directly by investors to research ideas, construct portfolios and manage risk in real time.

Engineers sit close to the problem space, solving complex data, performance and scale challenges rather than working on generic internal tooling.

What You\’ll Get

• Ownership of systems that directly influence investment decisions
• Exposure to modern, cloud-native architecture in a high-performance environment
• The ability to work across the full stack, from backend services to user-facing applications
• A culture that values clean design, scalability and engineering judgement
• Competitive compensation aligned to impact, not tenure

What You\’ll Do

• Design and build distributed, cloud-native services supporting large-scale equity workflows
• Develop high-performance backend systems using
  C#, Python and Go
  , with a strong focus on reliability and throughput
• Build and evolve APIs and service-to-service communication using
  gRPC
• Contribute to modern web interfaces built with
  React
  , used daily by investment professionals
• Work with large, complex datasets using analytical and columnar data stores such as
  Snowflake and ClickHouse
• Collaborate closely with users to iterate quickly while maintaining production-grade standards

What You\’ll Need

• Significant experience building and maintaining production systems (8+ years)
• Deep knowledge of an object-oriented language (
  C# or Java
  ) and strong Python experience
• Experience working with cloud infrastructure (AWS preferred)
• Comfort designing scalable systems and making architectural trade-offs
• Financial markets experience is beneficial but not essential, curiosity and problem-solving matter more
• A pragmatic, low-ego approach to engineering in a collaborative environment