Senior Java Engineer

We are seeking a highly skilled Senior Java Engineer to join a collaborative Agile engineering team delivering scalable, cloud-native solutions. This role is ideally suited to an experienced engineer who is passionate about software craftsmanship, enjoys knowledge sharing, and thrives in a highly collaborative environment where pair programming is a fundamental part of the team's day-to-day way of working.

Working within a modern engineering culture, you will help design, develop, and maintain high-quality applications using Java and AWS, while contributing to continuous improvement across development practices, automation, and delivery processes.

• Design, develop, and maintain robust, scalable applications using Java.
• Build and deploy cloud-native solutions leveraging AWS services.
• Participate in daily pair programming sessions as a core part of software delivery.
• Collaborate closely with engineers, architects, product stakeholders, and delivery teams.
• Champion engineering best practices including Test-Driven Development (TDD) and clean code principles.
• Contribute to the design and implementation of CI/CD pipelines to enable efficient and reliable software delivery.
• Support code reviews, technical discussions, and continuous improvement initiatives.
• Troubleshoot, optimise, and enhance existing applications and services.
• Promote a culture of collaboration, learning, and engineering excellence.

• Significant experience working as a Senior Java Engineer, Software Engineer, or Developer within Agile delivery environments.
• Demonstrable experience delivering production-grade applications using Java and AWS.
• Proven track record of working within teams that utilise pair programming as a standard engineering practice.
• Experience working across the full software development lifecycle.
• Strong background in automated testing, continuous integration, and continuous deployment.
• Ability to collaborate effectively with distributed teams and non-technical stakeholders.
• Experience working within consultancy, enterprise, or large-scale technology environments would be advantageous.

• Strong commercial experience developing enterprise applications with Java.
• Solid hands-on experience working with AWS cloud services.
• Proven experience implementing and maintaining CI/CD pipelines.
• Strong understanding and practical application of Test-Driven Development (TDD).
• Extensive experience with pair programming methodologies.
• Comfortable working in a continuous pair programming environment on a daily basis.
• Strong knowledge of Agile software development practices.
• Excellent communication and collaboration skills.

• Experience with microservices architectures.
• Knowledge of containerisation technologies such as Docker and Kubernetes.
• Experience with infrastructure-as-code approaches.
• Exposure to Dev Ops and Site Reliability Engineering practices.
• Experience mentoring and supporting other engineers.

With five strategic offices in Belfast, Chester, Farnborough, London and Oxford, we work in partnership with our customers UK-wide to deliver high-impact engineering solutions.

SII UK is a trusted Aerospace and Defence engineering partner, supporting the delivery of complex, mission-critical programmes while helping to shape the future of innovation across next-generation systems and technologies.

Our teams contribute daily to creating a fulfilling, stimulating and career development focused work environment.

True to our human-centred values, we are committed to making SII UK a Great Place To Work, having been certified 5 years running.

Joining SII UK means being part of our collective goals, guided by our mission "Let's Tech Together," and helping to build a digital future that is sustainable, at the heart of an environment that values learning & collaboration.