Java Developer
Summary
Contract Java Voice Services Developer in Ipswich (office-based, until March 2027, up to £360/day inside IR35) building SIP-based voice services with JAIN SLEE/SIP Servlets, administering FreeSWITCH/Asterisk, and integrating speech-to-text, NLP and conversational AI on AWS, Azure and GCP for a global technology client.
Java Voice Services Developer
Ipswich based- Candidates must be based in the UK, and a commutable distance from our client's office in Ipswich, Suffolk.
Contract until March 2027
Paying upto £360.00 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 innovative 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.
Desirable Skills
- Experience with Metaswitch Rhino SLEE or Oracle OCCAS.
- Knowledge of Docker and Kubernetes.
- Understanding of WebRTC, TLS, and SRTP security standards.