Senior Full Stack Developer

Role: Senior Full-Stack Developer Location: London (Hybrid) Industry: FinTech Startup Employment Type: Full-time About the Company We're recruiting for a fast-growing fintech startup building modern financial products that simplify how businesses and consumers manage money. Their team combines deep technical expertise with a product-first mindset to deliver scalable, secure, and user-friendly solutions in a highly regulated environment. They are looking for a Senior Full-Stack Developer to play a key role in designing, building, and scaling our core platform as we continue to grow. The Role As a Senior Full-Stack Developer, you will work across the entire technology stack to deliver high-quality applications and services. You’ll collaborate closely with product, design, and engineering teams to shape architecture decisions, improve developer experience, and deliver customer-facing features at pace. This is a hands-on role suited to someone who enjoys ownership, solving complex technical problems, and working in a fast-moving startup environment. Key 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 micro services * 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 Required Skills & Experience * 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 Nice to Have * Experience within fintech, payments, banking, or regulated industries, Docker and Kubernetes * Knowledge of event-driven architectures and message queues * Familiarity with GraphQL * Exposure to security and compliance standards relevant to fintech * Experience scaling systems in high-growth environments What They Offer * Competitive salary and equity package as well as a hybrid working environment in London * Opportunity to shape the engineering culture and technical direction * Work on meaningful products with real customer impact for a fast-paced startup environment with significant growth opportunities * Learning and development budget, pension scheme and additional benefits How to Apply Please send your CV, GitHub profile, and any relevant project links along with a short introduction outlining your experience and interest in the role. We welcome diverse applicants and are dedicated to treating all applicants with dignity and respect, regardless of background