Senior Java Developer

We are looking for an experienced Senior Java Developer to join the engineering team at Xantura, helping to design, build, and evolve our cloud-based data and analytics platform used by local authorities and public sector organisations across the UK. This is a hands-on senior engineering role focused on developing scalable backend systems, improving platform reliability and performance, and contributing to the ongoing evolution of our architecture, engineering standards, and development practices. You will work closely with Product, QA, Infrastructure, Customer Success, and Delivery teams to deliver high-quality technical solutions while helping to mentor and support other developers within the team. The role would suit someone who enjoys solving complex technical problems, working with large-scale data processing systems, and contributing to both technical delivery and engineering improvement initiatives. Key Responsibilities Design, develop, maintain, and support Java-based backend systems and services Develop scalable and performant solutions for data acquisition, processing, matching, analytics, and integration workloads Create and maintain high-quality SQL queries, stored procedures, and database structures Contribute to technical architecture discussions and platform evolution Improve system performance, scalability, resilience, monitoring, and operational reliability. Write clean, maintainable, well-tested code following agreed engineering standards and best practices Participate in peer reviews, technical design reviews, and collaborative problem solving Support and improve CI/CD pipelines and automated deployment processes using Azure DevOps Investigate and resolve complex production issues, system failures, and performance bottlenecks Support and troubleshoot services running in Linux-based environments. Work closely with infrastructure and platform teams to optimise Linux-hosted services and deployments Collaborate with QA teams to ensure robust testing and adherence to Definition of Done standards Mentor and support junior and mid-level developers within the team Contribute to continuous improvement of development processes, documentation, tooling, and engineering discipline Support the migration and modernisation of legacy systems and services into Azure-hosted solutions Skills, Knowledge & Expertise We’d love to hear from you if you have: A degree in Computer Science, Software Engineering, or a related technical discipline, or equivalent practical experience Strong commercial experience developing enterprise applications using Java Excellent technical knowledge of: - Java 17+ - SQL and relational database design - REST API development - Maven - Concurrent and asynchronous processing - Performance optimisation and troubleshooting - JUnit and automated testing approaches Strong working knowledge of Linux environments, including command-line tools, scripting, process management, logging, and troubleshooting Experience deploying, configuring, and supporting Java applications within Linux-based environments. Experience working with high-volume or data-intensive systems Experience working with CI/CD pipelines and source control workflows Experience using Azure DevOps or similar development lifecycle tooling Strong understanding of software engineering principles, clean code practices, and maintainable application design Strong analytical and problem-solving skills Good communication and collaboration skills, with the ability to work effectively within multi-disciplinary teams A proactive mindset with strong ownership, accountability, and continuous improvement focus Bonus points if you have: Experience working within Microsoft Azure environments Experience with data engineering or data warehousing platforms Experience working with distributed systems or event-driven architectures Experience with monitoring and observability tooling Experience working within Agile/SCRUM teams Experience improving engineering governance, development processes, and QA practices Experience supporting or modernising legacy enterprise applications Knowledge of security, compliance, and operational best practices within enterprise environments Job Benefits Competitive salary reviewed annually Work for a passionate, mission-driven company solving society’s big problems Work flexible hours around life commitments with a focus on delivering company value rather than hours worked Ability to work remotely (excluding face-to-face Team Meetings and client meetings) Training and development opportunities 25 days annual leave (plus bank holidays) Company pension Private medical insurance Generous enhanced parental leave policies Cycle to work scheme Flu Vaccinations, Eye Test and contribution towards Glasses for VDU use Employee Assistance Programme Mental health and wellbeing support Remote GP access Counselling/therapy Physiotherapy Medical second opinions