Principal Full stack Engineer (Ruby/React)

MCS Group; Belfast; On-site; GBP 60,000 - 80,000; Full time

Job summary

A well-funded insurtech scale-up is seeking a full-stack engineer to join their new hub in Northern Ireland. This role focuses on core product engineering, contributing to AI-driven innovations, and collaborating with teams in the US. Ideal candidates will have experience with React, Ruby, or Python, and a curiosity about AI/ML. Competitive salary and opportunities for travel to the US for onboarding are offered.

Benefits

Highly competitive salary

Travel to the US for onboarding

Impactful role from day one

Qualifications

• Full-stack engineering background with React, Ruby, or Python.
• Curiosity about AI/ML and willingness to experiment.
• Experience with cloud computing and regulated domains is a plus.

Responsibilities

• Deliver new features for the core platform.
• Contribute to AI/GenAI innovation.
• Collaborate with teams in the US.
• Represent the brand in Northern Ireland.

Skills

Strong full-stack engineering background

AI/ML curiosity

Cloud-native mindset

Awareness of regulated domains

Tools

React

Ruby

Python

AWS

Terraform

Kubernetes

DevOps

Job description

MCS Group are thrilled to be partnered with a well-funded insurtech scale-up that has recently closed a major funding round and is entering an exciting new growth phase. Founded over a decade ago, the company has grown from its early product innovation roots into a recognised player in the employee benefits space, providing dental, vision, and complementary insurance products to small and medium-sized businesses across the US.

Over the past 18 months, they've built out a new leadership team with deep expertise across insurance and technology, strengthened their partnerships with leading HR and benefits platforms, and sharpened their strategy to become the platform of choice for insurers.

At the centre of this growth is a modern, AI-enabled platform that powers underwriting, claims, and customer experience - designed for scale, compliance, and innovation.

Role Overview

As part of international expansion, the company is establishing a new engineering hub in Northern Ireland. This is a rare opportunity to join at the ground floor of a strategic build-out, contributing directly to core product engineering (not legacy or back-office work) and helping shape the hub's growth and culture.

You'll work on AI-driven product features, collaborate with senior engineers in the US, and help represent the company in NI's growing tech ecosystem. The first hires will travel to the US for in-depth onboarding (6+ weeks) to work side by side with experienced engineers and immerse themselves in the product.

What you'll do

• Deliver new features across the company's core platform.
• Contribute to AI/GenAI innovation - experimenting with and building new solutions.
• Collaborate closely with product, design, and engineering colleagues in the US.
• Represent the brand in NI and help shape the new engineering hub.
• Operate with autonomy and impact from day one.

What you'll bring

• Strong full-stack engineering background - ideally React, Ruby, and Python (but open to engineers from Java, .NET or similar who can cross-train).
• AI/ML curiosity - experience with Generative AI or willingness to experiment with emerging tools.
• Cloud-native mindset - AWS experience valued; Terraform, Kubernetes, DevOps exposure a plus.
• Awareness of working in regulated or compliance-heavy domains (insurance/fintech a bonus).

Why join?

• Highly competitive Salary: (senior or principal level, depending on experience).
• Be part of a post-funding, high-growth scale-up with real market traction.
• Work on core platform engineering with visibility and impact from day one.
• Help establish and shape a brand-new NI hub.
• Travel to the US for onboarding and work with a highly skilled team.

A chance to join a growing insurtech disruptor at a pivotal moment, working on AI-driven innovation and scaling a platform that's set to transform a $100B+ market

To speak in absolute confidence about this opportunity please contact Rachael Walker, IT Recruitment Manager at MCS Group02896935487 or click the apply button below.

If this position is not right for you, we have others that are.

Please visit MCS Group www.mcsgroup.jobs to view a wide selection of our current jobs or give us a call 028 9023 5456.

All conversations will be treated in the strictest of confidence.