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# Java Developer (SIP/VoIP)

- **Company:** Hays plc
- **Location:** Ipswich, UK
- **Salary:** £95,420.0
- **Contract:** Temporary contract
- **Skills:** Java (Programming Language), Artificial Intelligence, Amazon Web Services, Microsoft Azure, VoIP, Cloud Computing, DevOps, Java APIs for Integrated Networks, Java Servlet, Network Troubleshooting, Oracle (Applications), Systems Integration, Wireshark, WebRTC, Google Cloud, Chatbots, Multi-Cloud, Rhino, Docker
- **Published:** August 25, 2026
- **Apply:** https://www.reed.co.uk/jobs/java-developer-sip-voip/57276416

## About the Role

We're looking for an experienced Voice Services Developer to join a team delivering next generation voice and conversational AI platforms. You'll develop and support SIP-based voice services, manage FreeSWITCH/Asterisk environments, and integrate advanced Speech AI technologies across AWS, Azure and GCP., * Strong commercial Java development experience

 * Expertise in JAIN SLEE and SIP Servlet frameworks
 * Experience with FreeSWITCH or Asterisk
 * Strong understanding of SIP, RTP/RTCP and SDP
 * Experience integrating cloud-based speech services (AWS, Azure or GCP)
 * Multi-cloud deployment experience
Desirable:

 * Metaswitch Rhino SLEE or Oracle OCCAS
 * Docker and Kubernetes
 * WebRTC, TLS and SRTP

## Description

Java Developer (SIP/VoIP) Contract - Paying up to £367 Per Day, Inside IR35, Based in Ipswich, Hybrid Working, Contract until March 2027, To Start ASAP, * Develop and maintain SIP services using Java, JAIN SLEE and SIP Servlets

 * Configure and support FreeSWITCH and/or Asterisk platforms
 * Integrate STT, TTS and NLP capabilities into live voice solutions
 * Deploy and support applications across AWS, Azure and GCP
 * Troubleshoot VoIP, call quality and network issues using tools such as Wireshark and sngrep
 * Collaborate with architecture and DevOps teams to deliver scalable AI-driven voice solutions


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