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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Full Stack Engineer - **Company:** Requirementsteya - **Location:** London, UK - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), HTML5, Code Review, Cursor (Graphical User Interface Elements), Next.js, Responsive Web Design, TypeScript, Web Applications, Web Performance Optimization, GitHub Copilot, ReactJS, Backend, Git, Customer Identity Access Management, Maintaining Code, Graphql, Front End Software Development, React Redux, Es2015, Software Version Control, Api Management - **Published:** August 18, 2026 - **Apply:** https://www.apply4u.co.uk/jobs/x/44359336/ ## About the Role across the stack, applying strong TypeScript practices and contributing to overall system stability, security, and scalability.Actively participate in code reviews across frontend and backend contributions, helping establish engineering best practices in a team transitioning from a mobile-first to a full stack, web-capable organization.Identify and resolve performance bottlenecks, data inefficiencies, and production issues across the full stack, ensuring a smooth, reliable experience for merchant users.Stay up-to-date with the latest frontend technologies, trends, and best practices, applying them to enhance our merchant-facing web platform.Your Story5+ years of professional experience in frontend/web development.Expert-level proficiency in TypeScript, including advanced type manipulation, generics, and understanding of complex type inference.Strong proficiency in React.js and its core principles, developed with a type-safe approach.Experience supporting Backend services in Java and Spring BootExtensive experience with Next.js for server-side rendering, static site generation, and API routes, with a focus on TypeScript integration.Solid understanding of modern JavaScript (ES6+), HTML5, and CSS3.Experience with state management libraries (e.g., Redux, Context API, Zustand) in a TypeScript environment.Strong experience consuming GraphQL APIs (e.g., Apollo Client), with an understanding of how to define and use types for API responses.Strong understanding of web performance optimisation techniques.Experience with version control systems (e.g., Git).Excellent problem-solving skills and attention to detail.Strong communication and collaboration abilities, especially when working within cross-functional teams spanning product, design, backend, and mobile engineering.Differentiators (What Sets You Apart)Experience in fintech or banking web applications, including secure and compliant interfaces with SCA/2FA, PSD2, and RBACProven ability to build and translate mobile-first products into responsive web experiencesPractical use of AI coding tools (e.g. GitHub Copilot, Claude Code, Cursor) to accelerate development while maintaining code qualityExperience launching and localising web products across multiple European markets, including currency, regulatory, and language requirementsTeya is proud to be an equal opportunity employer.We are committed to creating an inclusive environment where everyone regardless of race, ethnicity, gender identity or expression, sexual orientation, age, disability, religion, or background can thrive and do their best work. We believe that a diverse team leads to better ideas, stronger outcomes, and a more supportive workplace for all.If you require any reasonable adjustments at any stage of the recruitment process whether for interviews, assessments, or other parts of the application-we encourage you to let us know. We are committed to ensuring that every candidate has a fair and accessible experience with us.LocationPorto; LondonEmployment TypeFull timeLocation TypeHybridDepartmentEngineering ## Description the design, development, and delivery of scalable, responsive full stack features for the Business Account portal using React, TypeScript, and GraphQL, with ownership spanning both frontend implementation and integration with backend services.Work closely with product and design teams to understand merchant needs and translate complex financial workflows-such as transfers, scheduled payments, account management, and Strong Customer Authentication (SCA) flows-into secure, end-to-end user experiences backed by reliable APIs.Build and maintain data-rich, high-performance interfaces for transaction feeds, balances, statements, and multi-currency views, ensuring efficient data fetching, state management, and seamless interaction with backend services.Develop and maintain GraphQL schemas, resolvers, and API integrations, ensuring consistency between frontend requirements and backend data models while promoting type safety and end-to-end reliability.Write clean, maintainable, and well-tested code ## Related Videos - [How a Small Team Shrank a Microsoft Monorepo by 94%](https://www.wearedevelopers.com/videos/1236-how-a-small-team-shrank-a-microsoft-monorepo-by-94) - [The Resilience of the World Wide Web](https://www.wearedevelopers.com/videos/1281-the-resilience-of-the-world-wide-web) - [Build and Deploy a Fullstack App with Open Source Tooling](https://www.wearedevelopers.com/videos/775-build-and-deploy-a-fullstack-app-with-open-source-tooling) - [Git for Code Reviews](https://www.wearedevelopers.com/videos/429-git-for-code-reviews) - [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape) - [Can SVG be fast? 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