Senior Software Developer (Voice / SIP Platforms) £55,000 £65,000 DOE | Hybrid Working (1x day a month office) Are you a seasoned developer with a passion for building robust, real-time communications platforms? Looking for a role where you can work on complex, enterprise-grade systems while still being close to the technical detail? This is an opportunity to join a well-established technology business with a strong reputation in communications and cloud-based solutions. Youll be part of a small, highly skilled development team working on the evolution of a large-scale SIP platform and its associated APIs, with plenty of scope to influence design, tooling, and future direction. The Role Working closely with the Development Manager, youll play a key role in enhancing and extending an existing SIP and VoIP platform used in production environments. This is a hands-on role suited to an experienced developer who enjoys solving complex protocol-level problems, building secure services, and integrating with third-party systems. Youll contribute across the full software lifecycle from design and development through to troubleshooting live issues while helping to improve development standards, security practices, and platform resilience. Key Responsibilities Design, develop, and enhance a production SIP/VoIP platform and supporting services

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