Senior Front End Developer

MCS Group; Belfast City District; On-site; GBP 51,000 - 85,000; Full time

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Job summary

MCS Group is seeking a Senior Front-End Engineer in Belfast to join its product engineering team. This hands-on role focuses on React and TypeScript, building AI-powered, dynamic UIs that scale with the product. You will shape front-end architecture and collaborate with Product, Design and Backend teams to deliver production-ready features.

You will tackle complex state, performance, accessibility and cross-location collaboration while influencing engineering standards and UI quality.

Qualifications

• Strong commercial experience with React and TypeScript.
• Experience building dynamic data-driven UIs and AI-powered features.
• Ability to work with Product, Design and Backend teams across locations.
• Strong focus on accessibility and performance.
• Experience delivering production-ready features in a fast-paced environment.

Responsibilities

• Build complex front-end applications using React and TypeScript.
• Develop dynamic UIs that render from data, configuration or AI outputs.
• Create conversational and chat-style product experiences.
• Integrate AI-powered functionality into customer-facing products.
• Design reusable components and scalable front-end architecture.
• Manage complex application state and asynchronous data flows.
• Optimize front-end performance and ensure accessibility.
• Collaborate with Product, Design and Backend teams.

Skills

React

TypeScript

Hooks

State management

Performance optimization

Accessibility

AI-powered features

Chat interfaces

Distributed teams

Tools

Webpack

CI/CD

Git

Job description

MCS Group is working with a growing technology business to recruit a Senior Front End Engineer to join its product engineering team. This is a hands‑on role for an experienced React engineer who enjoys working on modern product experiences and solving front‑end problems that go beyond traditional, fixed user interfaces.

The business is developing new AI-powered capabilities where elements of the user experience can be generated dynamically based on data, configuration and model outputs. You'll help build the front‑end architecture that allows these experiences to work reliably, safely and at scale.

This is an opportunity to work on front‑end engineering problems that are still relatively new across the industry. Rather than simply adding features to an established interface, you'll help shape how users interact with AI-powered software, including how dynamic content and components are generated, rendered and controlled within a production React application.

As their Senior Front‑End Engineer you'll have plenty of ownership, work alongside an experienced engineering team and have a genuine opportunity to influence how the front‑end architecture develops as the product grows.

The Role

The Front‑End Engineer will work closely with Product, Design, Backend and AI teams to build and evolve modern web applications using React and TypeScript.

Your work will include:

• Building complex front‑end applications using React and TypeScript
• Developing interfaces that can adapt or render dynamically based on data, configuration or AI- generated outputs
• Building conversational and chat‑style product experiences
• Integrating AI-powered functionality into real customer‑facing products
• Designing reusable components and scalable front‑end architecture
• Managing complex application state, data flows and asynchronous interactions
• Optimising front‑end performance and application responsiveness
• Building accessibility into products from the outset
• Working closely with Product and UX teams to turn new ideas into production‑ready features
• Collaborating effectively with engineers working across different locations and time zones
• Contributing to technical decisions, code reviews and engineering standards

What We’re Looking For

You’ll ideally have:

• Strong commercial experience with React and TypeScript
• Deep knowledge of React including hooks, component architecture, state management and performance optimisation
• Experience building modern, complex web applications rather than predominantly static interfaces
• Exposure to dynamically generated or data‑driven user interfaces
• Experience building AI‑powered product features, not simply using AI coding tools
• Experience building chat, messaging or conversational interfaces
• A good understanding of web accessibility and how to incorporate it throughout development
• Experience working within distributed engineering teams
• Strong communication skills and the ability to work closely with Product, Design and Backend Engineering
• Experience working with generative AI, LLM‑powered applications or interfaces where UI components are produced dynamically would be particularly valuable.

Salary

Up to £85,000 with share options

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