Ipswich based- Candidates must be based in the UK, and a commutable distance from our client's office in Ipswich, Suffolk.
Paying upto £****** per day (inside IR35)
Our client, a leading global technology organisation, is looking for an experienced Java Voice Services Developer to join a high-profile programme delivering next-generation communications and conversational AI solutions.
This is an exciting opportunity for a developer with strong telephony and cloud experience to work at the intersection of voice technologies, AI, and cloud platforms.
The Role
As a Java Voice Services Developer, you will be responsible for designing, developing, and supporting advanced SIP-based voice services while integrating cutting-edge speech and AI technologies.
You will collaborate with architects, DevOps teams, and cloud specialists to deliver scalable, high-performance communication platforms.
Key Responsibilities
Develop, test, and maintain SIP-based voice services using Java, JAIN SLEE, and SIP Servlet frameworks.
Configure, administer, and optimise FreeSWITCH and/or Asterisk communication platforms.
Integrate Speech-to-Text, Text-to-Speech,



and NLP solutions into live voice applications.
Deploy and support applications across AWS, Azure, and Google Cloud environments.
Troubleshoot network, voice quality, latency, and call routing issues using industry-standard tools.
Support the delivery of creative conversational AI and voice automation solutions.
Required Skills & Experience
Strong commercial Java development experience, including multi-threading and network programming.
Excellent knowledge of JAIN SLEE and SIP Servlet frameworks.
Proven experience with SIP, RTP/RTCP and SDP protocols.
Hands-on experience with FreeSWITCH and/or Asterisk.
Experience integrating cloud-based speech services and AI technologies.
Exposure to AWS, Microsoft Azure, and Google Cloud Platform environments.
Strong troubleshooting skills using tools such as Wireshark or sngrep.
Experience with Metaswitch Rhino SLEE or Oracle OCCAS.
Knowledge of Docker and Kubernetes.
Understanding of WebRTC, TLS, and SRTP security standards.
#J-*****-Ljbffr

📌 Java Voice Engineer (Queensland)
🏢 Marshall Wolfe
📍 Queensland