Experis UK
Software Engineering Specialist
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6 months
Hybrid
Inside IR35 - umbrella only
We are seeking a Voice Services Developer to build, maintain, and optimize our next-generation communication platforms. You will bridge the gap between traditional telecommunication protocols and modern cloud-based AI. Your core focus will be developing stable SIP services using Java, managing open-source media engines, and integrating advanced Speech AI technologies across multi-cloud environments.
Key Responsibilities
- SIP Development: Develop, test, and maintain mid-to-high performance SIP-based voice services using JAIN SLEE, SIP Servlets.
- Media Server Administration: Configure, manage, and scale FreeSWITCH or Asterisk communication engines.
- Speech AI Integration: Implement Speech-to-Text (STT), Text-to-Speech (TTS), and Natural Language Processing (NLP) workflows into live voice streams.
- Cloud Operations: Deploy and monitor voice applications across AWS, Azure, and Google Cloud Platform (GCP).
- Troubleshooting: Use network analysis tools to diagnose audio quality issues, call drops, and latency problems.
- Team Collaboration: Work alongside senior architects and DevOps teams to roll out scalable conversational AI bots.
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Required Skills & Qualifications
- Core Language: Professional experience with Java, including multi-threading and network programming.
- In-depth knowledge of Java
- Good knowledge of Java applications using JAIN SLEE framework, SIP Servlet Frameworks
- Telephony Engines: Hands-on experience configuring and scripting with FreeSWITCH or Asterisk.
- Voice Protocols: Solid understanding of SIP, RTP/RTCP, and SDP.
- Speech AI: Experience integrating cloud speech APIs (e.g., AWS Transcribe/Polly, Azure Speech, Google Cloud Speech-to-Text).
- Multi-Cloud Exposure: Experience deploying and managing applications on AWS, Azure, and GCP.
- Tools: Proficiency with Wireshark or sngrep for VoIP troubleshooting.
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Preferred Qualifications
- Experience with Java telephony frameworks like Metaswitch Rhino SLEE or Oracle OCCAS.
- Understanding of containerisation using Docker and Kubernetes in cloud environments.
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