> Markdown version of [/jobs/ext/25827-senior-front-end-developer](https://www.wearedevelopers.com/jobs/ext/25827-senior-front-end-developer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Front End Developer - **Company:** Mitsubishi Electric - **Location:** Hatfield, UK (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** HTML, JavaScript (Programming Language), .NET Framework, Web Accessibility, Application Programming Interfaces (APIs), Agile Methodology, Amazon Web Services, Browser Compatibility, Cascading Style Sheets (CSS), Cloud Computing, DevOps, Distributed Systems, Design of User Interfaces, OAuth, Memory Leaks, Semantic HTML, TypeScript, Web Content Accessibility Guidelines, Web Applications, Web Application Frameworks, ReactJS, Blazor, Backend, Event Driven Architecture, AngularJS, Material UI, Front End Software Development, Restful APIs - **Published:** May 20, 2026 - **Apply:** https://find.jobs/jobs-near-me/senior-front-end-developer-hatfield-hertfordshire/2778686563-2/ ## About the Role * 6+ years of professional experience in frontend or full-stack development. * Proven experience architecting and delivering large-scale UI applications. * Strong track record of building and maintaining reusable component libraries and design systems. * Experience working within Agile development environments. * Demonstrated ability to own features end-to-end, from design through to delivery. * Experience collaborating across engineering, product, and design teams. * Exposure to cloud platforms (particularly AWS) and modern deployment environments. * Experience working on performance-critical and user-focused applications. ## Description A Senior UI Developer responsible for designing, building, and evolving scalable, high-quality user interfaces across web and mobile platforms. They lead front-end architecture decisions, establish UI engineering standards, and collaborate closely with backend, DevOps, and QA teams to deliver performant, accessible, and maintainable applications. This role operates across Blazor, .NET 9/10, TypeScript, MAUI, Web Components, HTML, and CSS, within cloud-hosted, distributed systems running on AWS. Skills/Responsibilities: * Expert-level knowledge of HTML, CSS, JavaScript/TypeScript, and modern browser APIs. * Strong experience with SPA frameworks such as Blazor (Server & WebAssembly), Angular, or React. * Familiarity with .NET MAUI or similar hybrid mobile frameworks. * Solid understanding of Web Components (Custom Elements, Shadow DOM, Templates). * Experience integrating with RESTful APIs. * Design and build scalable, component-driven UI architectures. * Develop reusable UI components and shared libraries. * Apply best practices in component composition, state management, and UI modularisation. * Ensure interoperability between modern frameworks and Web Components. * Deep understanding of DOM lifecycle, browser APIs, and rendering behaviour. * Implement accessible, standards-compliant UI (WCAG, ARIA, semantic HTML). * Apply progressive enhancement principles. * Optimise frontend performance through efficient rendering, lazy loading, and bundle size reduction. * Diagnose and resolve performance bottlenecks and memory leaks. * Ensure responsive, mobile-first design and cross-browser compatibility. * Build and maintain cross-platform UI for web and mobile environments. * Share UI components across platforms and implement platform-specific enhancements. * Handle device capabilities and native integrations. * Design UI solutions that support asynchronous and event-driven systems. * Integrate with backend services using REST APIs and authentication flows (JWT, OAuth). * Understand and troubleshoot issues across frontend-backend boundaries. * Work with cloud-based and event-driven architectures (e.g. AWS services). ## Related Videos - [Blazor Unleashed: The Future of .NET Web Development](https://www.wearedevelopers.com/videos/1564-blazor-unleashed-the-future-of-net-web-development) - [The Resilience of the World Wide Web](https://www.wearedevelopers.com/videos/1281-the-resilience-of-the-world-wide-web) - [Keeping applications secure by evolving OAuth 2.0 and OpenID Connect](https://www.wearedevelopers.com/videos/100152-keeping-applications-secure-by-evolving-oauth-2-0-and-openid-connect) - [Microfrontends at Scale](https://www.wearedevelopers.com/videos/236-microfrontends-at-scale) - [Blazor – the new SPA Framework for everyone who hates JavaScript](https://www.wearedevelopers.com/videos/699-blazor-the-new-spa-framework-for-everyone-who-hates-javascript) - [To New Frontiers: The Future of Frontend Development](https://www.wearedevelopers.com/videos/404-to-new-frontiers-the-future-of-frontend-development) ## Related Articles - [The Best 7 Frontend Frameworks for Developers in 2025](https://www.wearedevelopers.com/magazine/400-the-best-7-frontend-frameworks-for-developers-in-2025) - [Frontend Developer Salary in The UK](https://www.wearedevelopers.com/magazine/233-frontend-developer-salary-in-the-uk) - [16 Best Free React UI Libraries in 2025](https://www.wearedevelopers.com/magazine/148-16-best-free-react-ui-libraries-in-2025) - [Dev Digest 133 - Back to Front](https://www.wearedevelopers.com/magazine/474-dev-digest-133-back-to-front) - [What’s the Difference Between Frontend and Backend Development?](https://www.wearedevelopers.com/magazine/240-what-s-the-difference-between-frontend-and-backend-development) - [Frontend Developer Salary in Germany [2023]](https://www.wearedevelopers.com/magazine/195-frontend-developer-salary-in-germany-2023)