Mid & Senior Java Developers

MCS Group is working with a major technology-led organisation as it builds a new engineering capability in Belfast. This is a significant period of growth, with multiple opportunities available for experienced Java Developers across mid-level, senior and technical leadership grades.

You will join a collaborative engineering environment, delivering modern software solutions for large, complex projects. The work offers plenty of technical variety, combining hands-on development with opportunities to influence design, improve engineering practices and support other developers.

The role

• Design and build scalable backend applications and services using modern Java.
• Develop secure REST APIs and integrations for complex, business-critical platforms.
• Help modernise existing systems and move applications towards cloud-native architectures.
• Contribute to technical design, architecture discussions and engineering standards.
• Build automated tests and support applications from development through to production.
• Diagnose performance issues and resolve complex live-service incidents.
• Work alongside engineers, architects, testers and non-technical stakeholders.
• At the more senior level, provide technical direction, mentor developers and take ownership of delivery.

What you need

• Strong commercial Java development experience.
• Experience with Spring or Spring Boot.
• A good understanding of object-oriented development, SOLID principles and common design patterns.
• Experience designing and developing REST APIs.
• Knowledge of automated testing and secure coding practices.
• Experience with CI/CD tools such as Jenkins, GitHub Actions or similar.
• Experience with AWS, Azure or GCP.
• Strong communication skills and the ability to explain technical decisions clearly.

Experience with Kafka, SQS, serverless technologies, Hibernate, observability tooling or AI-assisted development would be advantageous but is not essential.

Why it's worth a look

• Join a major Belfast hiring programme with genuine long-term progression.
• Work across varied, high-impact engineering projects rather than maintaining one product indefinitely.
• Access structured training, professional qualifications and cloud certifications.
• Develop experience across modern Java, cloud, containers and distributed systems.
• Move into technical leadership without having to step away from hands-on engineering.
• Hybrid and flexible working arrangements.

To speak in absolute confidence about this opportunity, please send an up to date CV via the link provided or contact Matthew Rainey at

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 and exclusive roles

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.

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Full job description from the advertiser. Apply for this role →