Senior Java Developer

Our client, a software vendor in the security space, is seeking an experienced Backend Developer with a telecoms background to design, build and run high-volume data services. This is an end-to-end ownership role: you’ll shape new features alongside users, ship them in short iterations, and keep them running reliably in production.

What you’ll do

• Design and build services that process and store large volumes of data, including telecoms signalling and media traffic, choosing the right storage technology for each job
• Maintain and improve existing services for performance, stability and data integrity
• Troubleshoot production issues across code, infrastructure, networks and databases
• Write clean, well-tested, maintainable code within a peer-review culture
• Work closely with cross-functional teams, customers and end users

What you’ll bring

• 5+ years’ professional software development, with Java (8+) as your primary language
• Telecoms experience, with hands-on knowledge of 3GPP standards and SIP/RTP protocols
• Solid experience across relational (SQL) and NoSQL databases
• Proven track record building distributed, microservice-based and event-driven systems
• Strong grasp of architecture, design patterns and trade-offs
• Hands-on Docker, Linux and command-line proficiency
• Observability experience with Prometheus and Grafana
• Understanding of Mechanical Sympathy and working knowledge of low-level network programming

Nice to have: IMS, VoLTE/VoNR, Diameter or SS7 exposure; Spring Boot; Kafka, RabbitMQ, NSQ or ActiveMQ; MongoDB and Elasticsearch; Spark, Iceberg or data warehouse design; S3-style object storage; Ansible and Kubernetes; Python.