Java Developer (SIP/VoIP)

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 services (AWS, Azure or GCP) Multi-cloud deployment experience Desirable: Metaswitch Rhino SLEE or Oracle OCCAS Docker and Kubernetes WebRTC, TLS and SRTP What you need to do now If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now. If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career. Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk