Senior Telephony & VOIP Engineer (SIP, Cloud)

KBC Technologies Group; Greater London; On-site; GBP 60,000 - 80,000; Full time

Job summary

A telecommunications technology firm based in Greater London is seeking a Senior Engineer with deep experience in telephony solutions. This hands-on role requires expertise in C/C++ programming for VoIP systems, solid understanding of SIP protocol, and familiarity with public cloud environments like AWS or Azure. Candidates should be comfortable with Linux administration and have experience working with open-source software such as Asterisk and Freeswitch. The position involves designing and maintaining telecommunication services, requiring strong problem-solving skills and collaboration across teams.

Qualifications

• Deep expertise and experience in telephony/voice software engineering.
• Significant experience with SIP protocol, signalling, and analysis.
• Comfortable with automated environments and Infrastructure as Code.

Responsibilities

• Design, ship and maintain telecommunication services.
• Support production systems and collaborate across teams.
• Solve complex problems in audio-related systems.

Skills

Telephony programming

Agile software development

C/C++ programming for VoIP

SIP protocol knowledge

Network routing and NAT

Linux administration

Open-source software experience

Container platforms (Docker, Kubernetes)

Tools

AWS

Azure

GCP

Terraform

SIPp

Asterisk

Freeswitch

OpenSIPs

Job description

A telecommunications technology firm based in Greater London is seeking a Senior Engineer with deep experience in telephony solutions. This hands-on role requires expertise in C/C++ programming for VoIP systems, solid understanding of SIP protocol, and familiarity with public cloud environments like AWS or Azure. Candidates should be comfortable with Linux administration and have experience working with open-source software such as Asterisk and Freeswitch. The position involves designing and maintaining telecommunication services, requiring strong problem-solving skills and collaboration across teams.