About this role
Salary: £? - ? per year
Requirements: Professional experience with Java, including multi-threading and network programming.In-depth knowledge of Java.Good knowledge of Java applications using JAIN SLEE framework and SIP Servlet frameworks.Hands-on experience configuring and scripting with FreeSWITCH or Asterisk.Solid understanding of SIP, RTP/RTCP, and SDP.Experience integrating cloud speech APIs, such as AWS Transcribe/Polly, Azure Speech, or Google Cloud Speech-to-Text.Experience deploying and managing applications on AWS, Azure, and GCP.Proficiency with Wireshark or sngrep for VoIP troubleshooting.Experience with Java telephony frameworks like Metaswitch Rhino SLEE or Oracle OCCAS.Understanding of containerisation using Docker and Kubernetes in cloud environments. Responsibilities: Develop, test, and maintain mid-to-high performance SIP-based voice services using JAIN SLEE and SIP Servlets.Configure, manage, and scale FreeSWITCH or Asterisk communication engines.Implement Speech-to-Text (STT), Text-to-Speech (TTS), and Natural Language Processing (NLP) workflows into live voice streams.Deploy and monitor voice applications across AWS, Azure, and Google Cloud Platform (GCP).Use network analysis tools to diagnose audio quality issues, call drops, and latency problems.Work alongside senior architects and DevOps teams to roll out scalable conversational AI bots. Technologies: AIAWSAsteriskAzureCloudDevOpsDockerGCPJavaKubernetesNetworkOracle More:
We are seeking a Voice Services Developer to build, maintain, and optimize our next-generation communication platforms. This is a 6-month hybrid role inside IR35, umbrella only. You will bridge the gap between traditional telecommunication protocols and modern cloud-based AI, with a core focus on developing stable SIP services using Java, managing open-source media engines, and integrating advanced Speech AI technologies across multi-cloud environments. If you receive suspicious outreach claiming to be from us, please contact us via the ManpowerGroup website.
last updated 35 week of 2026