Our client, a large enterprise, is seeking a Senior Full- Stack Engineer to join an established trading platform programme. This production- critical system is long- lived, actively evolving, and places strong emphasis on performance, reliability, and maintainability. You will join a highly experienced team of senior engineers and QA developers, taking full ownership of features from design through to production, while collaborating directly with the client. Key Responsibilities Design, build, and maintain features across the full stack of a high- performance trading platform. Work primarily with: TypeScript ( Node. js & React) Monorepo tooling, GitHub, GitHub Actions Jest, Playwright Redis, MS SQL, WebSockets Docker, Kubernetes Observability tools ( Grafana, Prometheus, SonarQube) Take end- to- end ownership of features from design to production. Collaborate closely with platform and DevOps engineers on build pipelines, observability, and operational concerns. Communicate directly with clients to clarify requirements and propose solutions. Contribute to and improve automated testing practices. Participate in peer code reviews and maintain high engineering standards. Leverage LLM/ AI- enabled development tools as part of day- to- day development. Requirements 8 years of professional software development experience. 3 years hands- on experience with TypeScript, Node. js, and React. Good experience building and maintaining production systems. Comfortable working in a senior, autonomous engineering team. Good communication skills and fluency in English. Hybrid working in Waterloo, London. Desirable Experience with functional programming ( OCaml, Haskell). Prior experience in trading, finance, or real- time systems. Solid understanding of DevOps and operational concerns ( logging, metrics, automation). London- based and willing to travel to company/ client events. Benefits 5 days/ year dedicated to training. £ 1,000 annual training allowance ( up to 50% usable for home workstation equipment). Company equipment and on boarding kit. In- person team events every 3 months. Annual bonus ( company and personal performance dependent). Stock option plan. Birthday off. Generous employee referral programme. About the Client Our client is a well-established engineering consultancy specialising in high-assurance systems and advanced technologies. They are known for delivering robust, scalable solutions and fostering a strong engineering culture focused on quality and innovation. If this role is of interest, please apply with your latest CV or reach out for a confidential discussion.