Java Developer
Summary
This role involves developing and enhancing SIP-based voice applications using Java, JAIN SLEE, and SIP Servlet frameworks. The developer will work on large-scale telecoms platforms, integrating AI-driven voice services and deploying solutions across AWS, Azure, and GCP.
Salary: £45,000 - 70,000 per year
Requirements:- Strong commercial Java development experience
- Experience with SIP, VoIP, RTP/RTCP and SDP
- Knowledge of JAIN SLEE and/or SIP Servlet frameworks
- Experience with FreeSWITCH or Asterisk
- Cloud experience across AWS, Azure or GCP
- Strong troubleshooting skills within telecoms or voice environments
- Docker and Kubernetes
- WebRTC
- Telecoms security protocols including TLS and SRTP
- Metaswitch Rhino SLEE or Oracle OCCAS experience
- Developing and enhancing SIP-based voice applications using Java
- Working with JAIN SLEE and SIP Servlet frameworks
- Supporting and integrating voice platforms including FreeSWITCH and Asterisk
- Deploying and supporting solutions across AWS, Azure and GCP
- Integrating Speech-to-Text, Text-to-Speech and AI-driven voice services
- Troubleshooting voice quality, call routing and network performance issues
- AI
- AWS
- Asterisk
- Azure
- Cloud
- Docker
- GCP
- Java
- Kubernetes
- Network
- Oracle
- Security
More:
We are a leading telecoms company seeking an experienced Java Developer to join our team delivering next-generation voice and communications platforms. This is a 6 month contract role based in Ipswich with a hybrid working arrangement and is inside IR35. You will work on large-scale telecoms services, cloud technologies and AI-powered voice solutions in a dynamic environment.
last updated 34 week of 2026