Software Engineering Specialist (Voice/JAIN SLEE)

I am currently seeking a Voice Services Developer for an exciting project with an enterprise voice development team. Given your strong background in Java and telephony systems, I thought this might be a great fit. Quick…

Pay rate £300 – £350/day
Contract type Contract
Posted 26 August 2026

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About this contract

I am currently seeking a Voice Services Developer for an exciting project with an enterprise voice development team. Given your strong background in Java and telephony systems, I thought this might be a great fit.

Quick Highlights:

Focus: Developing, testing, and maintaining mid-to-high performance SIP-based voice services using Java (JAIN SLEE, SIP Servlets) and integrating advanced Speech AI technologies across multi-cloud environments.
Environment: Agile, cross-functional delivery unit configuring media engines like FreeSWITCH or Asterisk, analyzing network traffic, and deploying conversational AI bots alongside senior architects and DevOps teams.
Requirements: Professional Java experience (including multi-threading and network programming), hands-on scripting with FreeSWITCH or Asterisk, deep knowledge of voice protocols (SIP, RTP/RTCP, SDP), and experience with cloud Speech APIs (AWS, Azure, GCP) and Wireshark/sngrep.This is an urgent vacancy where the hiring manager is shortlisting for an interview immediately. If interested, please share your updated CV with me at manisha. devaruppala @ randstad (url removed), and let's coordinate a brief call to discuss further.

Best Regards,
Manisha

Randstad Technologies is acting as an Employment Business in relation to this vacancy

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