Software Engineering Specialist (Voice/JAIN SLEE)

Randstad Technologies Recruitment; Ipswich; On-site; GBP 70,000 - 100,000; Full time

Job summary

Randstad Technologies Recruitment is seeking a Voice Services Developer for an enterprise voice development team in the UK. The role focuses on developing, testing, and maintaining SIP-based voice services using Java, with exposure to FreeSWITCH/Asterisk and cloud Speech APIs.

You will work in an Agile delivery unit, collaborating with architects, DevOps, and cross-functional teams to deploy AI-enabled voice solutions across multi-cloud environments.

Qualifications

• 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.
• Experience with cloud speech APIs (AWS, Azure, GCP) and packet analysis tools.

Responsibilities

• Develop, test, and maintain SIP-based voice services in Java.
• Collaborate with cross-functional teams including DevOps and architects.
• Integrate Speech AI technologies across multi-cloud environments.
• Analyze network traffic to optimize performance.

Skills

Java

SIP

RTP/RTCP

SDP

Multi-threading

Network programming

Cloud Speech APIs

Tools

FreeSWITCH

Asterisk

Wireshark

sngrep

Job description

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.