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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Frontend-Focused Full Stack Engineer - **Company:** MCS Group - **Location:** Belfast, UK - **Experience:** Expert - **Salary:** £45,000.0 - £55,000.0 - **Contract:** Permanent contract - **Skills:** Clean Code Principles, HTML, JavaScript (Programming Language), .NET Framework, Application Programming Interfaces (APIs), Computing Platforms, HTML5, Business Software, C Sharp (Programming Language), Cascading Style Sheets (CSS), Software Design Patterns, Web Development, Entity Framework, Design of User Interfaces, Microsoft SQL Server, Object-Oriented Software Development, Software Systems, SQL Databases, Systems Integration, Web Applications, ReactJS, Backend, Solid Principles, Data Analytics, Codebase, Front End Software Development, Restful APIs, Service Stack - **Published:** October 2, 2026 - **Apply:** https://www.careerjet.co.uk/job/gbb8120ef6ef39134e3caa4ea283787e4e/eaa ## About the Role * 3+ years' commercial experience with C# and .NET * Strong frontend skills across JavaScript, HTML5 and CSS * Commercial React experience or strong modern JavaScript experience * Experience building responsive, customer-facing web applications * Strong knowledge of OOP, SOLID principles and design patterns * Experience with Microsoft SQL Server * Ability to write clean, reusable and scalable code * Strong analytical and problem-solving skills * Excellent communication skills across technical and non-technical teams ## Description MCS Group are delighted to be partnering with an established technology organisation as they seek to appoint a Frontend-Focused Full Stack Engineer to join their development team. This is an exciting opportunity to join a well-established software business whose platform is used by organisations across the UK and internationally. The successful candidate will work on a suite of public-facing eCommerce websites, helping to enhance existing applications while contributing to the development of new functionality and modern user experiences. This is a frontend-focused full stack position, ideal for an experienced C#/.NET developer who has a strong interest in modern web development and wants to spend a significant proportion of their time working with React, JavaScript, HTML and CSS, while continuing to contribute across the backend. The Role As a Frontend-Focused Full Stack Engineer, you'll work as part of a collaborative development team responsible for developing, maintaining and enhancing a portfolio of customer-facing web applications. The role has a strong emphasis on frontend development and user experience, with React and modern JavaScript technologies forming an increasingly important part of the technology stack. You'll also use your C#/.NET experience to develop APIs, backend functionality and integrations where required. Responsibilities will include: * Developing and maintaining multiple public-facing eCommerce websites using modern frontend technologies * Building responsive user interfaces using React, JavaScript, HTML5 and CSS, based on client and UI/UX specifications * Developing reusable frontend components and contributing to the modernisation of existing web applications * Developing and integrating REST APIs and backend functionality using C#/.NET * Working with SQL Server and Entity Framework to support application functionality and data-driven features * Applying SOLID principles, design patterns and best practices to produce clean, scalable and maintainable code * Identifying and implementing improvements across existing systems, codebases and development processes * Collaborating closely with Development, QA and Project Management teams to deliver high-quality software solutions, You'll have the opportunity to use your existing backend expertise while placing React, JavaScript and modern frontend development at the heart of your day-to-day work, contributing to reusable components, improved user experiences and the continued evolution of a globally used software platform. Interview Process * Single-stage, in-person interview * Short technical exercise covering JavaScript, SQL, C#, CSS and HTML * Technical interview with senior engineering leadership ## Related Videos - [The Resilience of the World Wide Web](https://www.wearedevelopers.com/videos/1281-the-resilience-of-the-world-wide-web) - [Watch Tests Go Brrrr! : Getting Started with Cypress in ReactJS](https://www.wearedevelopers.com/videos/282-watch-tests-go-brrrr-getting-started-with-cypress-in-reactjs) - [Microfrontends at Scale](https://www.wearedevelopers.com/videos/236-microfrontends-at-scale) - [Can SVG be fast? Rendering a scatter chart with over 10k points](https://www.wearedevelopers.com/videos/100299-can-svg-be-fast-rendering-a-scatter-chart-with-over-10k-points) - [NoLoJS - Avoiding JavaScript Cruft with HTML and CSS - Aaron T. 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