Principal Java Engineer (Backend) - Scale-Up Security Tech - Remote/Hybrid (Ireland/NI)
€105-111k + 10% bonus + Equity
Event-Driven Microservices | Java | AWS | Hands-on Leadership An innovative scale-up is looking for a Principal Java Engineer to help them re-architect a critical platform used by law enforcement, emergency response, and global enterprise retailers. With $30 million Series A funding secured, they're scaling fast - across the UK, Ireland, the US, and Middle East - and building out their in-house software capability after years of outsourced development. You'll play a key role in rebuilding their platform from a monolithic legacy system to a modern, event-driven microservices architecture hosted on AWS. What you'll do
Lead the design and build of scalable Java microservices in an event-driven architecture
Help re-architect a platform used by thousands of users globally - high visibility, high impact
Work closely with product, QA, design, and senior engineering leadership
Provide hands-on coding, technical mentoring, and code reviews
Champion best practices in software design, performance, and system reliability
Be a key voice in technical strategy and architecture discussions
About you
6+years' experience with Java and Spring Boot, strong backend focus
Currently in a Principal, Staff or Tech Lead hands-on role Expertise in microservices and event-driven systems (Kafka, SNS/SQS, etc.)
Solid cloud experience in AWS
Experience breaking down monoliths into distributed systems
Comfortable in fast-paced scale-up environments - wearing multiple hats when needed
Strong communicator with a collaborative mindset
Bonus: exposure to C/C++ (due to the hardware element of the product)
What's on offer
€105-111k base salary
10% bonus + Equity/Share Options
Private healthcare after 25+ days
No pension currently offered
Flexible hybrid working - 1 day/week in Belfast HQ with occasional Dublin visits
Why join? You'll be joining a high-growth tech scale-up on a mission to improve public and workplace safety through cutting-edge hardware and software. It's an opportunity to do meaningful technical work, influence architecture, and help shape a product that's making a real-world difference - all while working alongside smart, supportive people in a down-to-earth team. To speak in absolute confidence about this opportunity please contact Jack Tyrrell, Specialist Recruitment Consultant at MCS Group 016994371or send an up to date CV via the link provided. If this position is not right for you, we may have others that are. Please visit
www.mcsgroup.jobs
to view a wide selection of our current jobs.
All conversations will be treated in the strictest of confidence.
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