Principal React Developer

MCS Group is looking for a highly experienced Principal React Developer to lead the design and delivery of modern, scalable front‑end applications. This is a hands‑on role where you'll shape architecture, set best practice, and mentor engineers within a collaborative product‑focused team. This is a key hire for this development team, and will be a position of technical influence within the company.

This is an excellent opportunity work on complex front‑end challenges, and make a real impact while enjoying the flexibility of a hybrid role based in Belfast.

• Help define and evolve front‑end solutions for large‑scale platforms, balancing design intent with technical practicality, performance and inclusivity.
• Turn product and design concepts into well‑structured, production‑ready interfaces that integrate cleanly with underlying services.
• Work alongside delivery, data and analysis teams to clarify requirements, constraints and technical trade‑offs.
• Take an active role in end‑to‑end delivery, keeping senior engineering stakeholders informed of progress and risks.
• Create and enhance customer‑facing functionality, while developing shared components and patterns through an internal design system.

• React 18+ & Type Script - advanced hooks, generics, composition patterns and performance optimisation
• Tailwind CSS and custom design systems
• React Hook Form for complex validation and type‑safe API contracts
• Storybook 8 for component documentation and visual testing

• Micro‑frontend architectures within an Nx workspace
• Component‑driven development and design systems
• Domain‑driven design for business logic
• API‑first, type‑safe development

Salary
: £80k - £95k DOE
Competitive benefits package including bonus.

To speak in absolute confidence about this opportunity please send an up to date CV via the link provided or contact Jill Johnston, Head of IT Contracts, at MCS Group

Even if this position is not right for you, we may have others that are. Please visit MCS Group to view a wide selection of our current jobs (Use the "Apply for this Job" box below)..jobs

MCS Group is committed to Equality, Diversity, and Inclusion for all, being the first recruitment agency in NI to achieve Bronze Diversity Mark accreditation, if you have a disability which means you require a reasonable adjustment to be considered at any stage of the recruitment process, please contact us and we will endeavour to facilitate the request.

Not all agencies are the same… MCS Group are passionate about providing a first‑class service to all our customers and have an independent review rating of 4.9 stars on Google.