Company: Flint Technology Services
Location: Ipswich
Job Description:
Salary: £76,000 – 97,000 per year
Requirements
- Professional experience with Java, including multi-threading and network programming.
- In-depth knowledge of Java.
- Experience using JAIN SLEE and SIP Servlet frameworks for Java applications.
- 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, and 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 such as 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.
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
- AI
- AWS
- Asterisk
- Azure
- Cloud
- DevOps
- Docker
- GCP
- Java
- Kubernetes
- Network
- Oracle
- Security
More
Flint are seeking a Software Engineer/Developer to build, maintain, and optimize our clients next-generation communication platforms. We bridge the gap between traditional telecommunication protocols and modern cloud-based AI, with a core focus on stable SIP services, open-source media engines, and advanced Speech AI technologies across multi-cloud environments.
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Posted: October 5th, 2026