Software Developer

Rubicon Consulting is currently recruiting for a Software Developer on a 4+ year contract based in Suffolk.

Role Summary

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.

Requirements:

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.

Preferred Qualifications

Experience with Java telephony frameworks like Metaswitch Rhino SLEE or Oracle OCCAS.

Understanding of containerisation using Docker and Kubernetes in cloud environments.

Knowledge of WebRTC and telephony security standards like TLS and SRTP.

Our Company

Rubicon Consulting is a Talent management consultancy which helps you to optimise business performance and competitive advantage by choosing the right people first time!