Senior Java Engineer – Hybrid API Expert

Job Overview

We are looking for a talented and experienced Java developer to join our rapidly growing team to design and build innovative solutions for a broad range of clients.

• Design, develop, and maintain high-quality Java codebases.
• Participate throughout the software development lifecycle, from design to deployment and maintenance.
• Engage and provide technical insight during system design.
• Collaborate with cross‑functional teams to deliver software solutions.
• Write well‑documented code and contribute to technical documentation.
• Proactively troubleshoot issues, maintain the smooth operation of live services, and play a key role in resolving complex production issues.
• Stay up to date with the latest Java technologies and best practices, assessing their impact and identifying opportunities for adoption.
• Effectively communicate complex technical topics to both technical and non‑technical audiences.
• Actively contribute to the engineering community.

• Proven Java development experience (including JVM‑based languages such as Kotlin and Scala), with advanced Java features and mentoring experience.
• Experience with Spring Framework (Spring MVC, Spring Boot).
• Experience designing, developing, and securing RESTful APIs, including threat assessment throughout the development process.
• Deep understanding of OOP principles (SOLID), design patterns, and secure coding practices.
• Experience deploying and managing applications using containerisation technologies (Docker, Kubernetes).
• Experience using version control strategies (e.g., Git).
• Understanding of system performance monitoring, performance issue diagnosis, and implementing solutions.
• Experience using CI/CD pipelines and tools (Jenkins, Bitbucket Pipelines, Git Hub Actions).
• Working knowledge of cloud platforms (AWS, GCP, Azure) and their core services.

• Experience with message queueing solutions (Kafka, SQS), Serverless technologies (Lambda), and monitoring and logging tools (Dynatrace, ELK stack, Splunk).
• Experience using logging to derive application insights.
• Consideration of non‑functional requirements (security, accessibility, and observability) during design and development.
• Solid understanding of Object‑Relational Mapping principles and proficiency in JPA and Hibernate.
• Experience using Swagger for API documentation and coding alongside AI Assistants (Git Hub Copilot).
• Experience with test tools such as Selenium, Axe, Postman, or Bruno.
• Experience delivering complex projects from backlog through to production.

• Excellent communication, collaboration, and problem‑solving abilities to navigate dynamic, fast‑paced environments.
• Ability to understand task requirements, dependencies, and prioritise work effectively for the team.
• Ability to mentor and guide junior engineers.
• Will and eligibility to obtain UK security clearance (Security Check) if required.

You will be based in Belfast, working under a hybrid model that combines local office presence, virtual collaboration, client site visits, and remote work where applicable.