https://jobs.co.uk/job/java-developer-sipvoip-hays-specialist-recruitment-limited--69f6a9c2-77c0-4558-a047-470e3db8d790 RSS feed for Java Developer (SIP/VoIP) at Hays Specialist Recruitment Limited. en-gb Thu, 03 Sep 2026 01:41:03 GMT https://jobs.co.uk/job/java-developer-sipvoip-hays-specialist-recruitment-limited--69f6a9c2-77c0-4558-a047-470e3db8d790 https://jobs.co.uk/job/java-developer-sipvoip-hays-specialist-recruitment-limited--69f6a9c2-77c0-4558-a047-470e3db8d790 Sat, 29 Aug 2026 11:53:00 GMT Location: Ipswich | Salary: 367.00-367.00 Daily | Type: Permanent | 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 Your new 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.Key Responsibilities: 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 What you''ll need to succeed 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 service... Permanent