Salary: £70,000 - 90,000 per year Requirements: 5 years of commercial software development experience Strong expertise in TypeScript across frontend and backend applications Advanced experience with React and modern frontend tooling Strong backend development experience with Node.js Experience working with MongoDB in production environments Solid understanding of API design and distributed systems Experience with cloud platforms such as AWS, GCP, or Azure Familiarity with CI/CD pipelines and modern DevOps practices Strong understanding of software engineering principles, testing, and system design Experience working in agile product teams or startup environments Excellent communication and collaboration skills Experience within fintech, payments, banking, or regulated industries is a plus Knowledge of event-driven architectures and message queues is a plus Experience with Docker and Kubernetes is a plus Familiarity with GraphQL is a plus Exposure to security and compliance standards relevant to fintech is a plus Experience scaling systems in high-growth environments is a plus Responsibilities: Design, build, and maintain scalable web applications using TypeScript, React, Node.js, and MongoDB Develop clean, maintainable, and well-tested frontend and backend code Build and optimise RESTful APIs and microservices Collaborate with product managers and designers to deliver intuitive user experiences Improve application performance, reliability, and security Participate in architecture discussions and technical decision-making Mentor junior developers and contribute to engineering best practices Support CI/CD pipelines, testing strategies, and deployment processes Work closely with DevOps and infrastructure teams in cloud environments Own features and technical solutions across the full technology stack Technologies: API AWS Azure Backend CI/CD Cloud DevOps Docker Frontend GCP GraphQL Support Kubernetes MongoDB React Security TypeScript Web microservices NodeJS GitHub Fullstack More: We are a fast-growing fintech startup based in London and working in a hybrid model. We build modern financial products that simplify how businesses and consumers manage money, combining deep technical expertise with a product-first mindset to deliver scalable, secure, and user-friendly solutions in a highly regulated environment. As a Senior Full-Stack Developer, you will help shape our core platform, influence engineering culture and technical direction, and work on meaningful products with real customer impact. We offer a competitive salary and equity package, a learning and development budget, a pension scheme, additional benefits, and significant growth opportunities in a fast-paced startup environment. last updated 20 week of 2026