Core Voice Signalling Designer

You will help design and steer designs for signalling-related projects, directing project teams to ensure optimal delivery outcomes. You will play a key role in shaping and steering design across core voice network platforms. Reporting into the Subscriber Management and Signalling Engineering Manager, you will act as a trusted design authority within project teams to ensure solutions are robust, scalable and customer focused. In this role, you will work across a broad range of signalling technologies, contributing to both legacy and next generation network evolution. You will lead on design requirements, influence vendor outcomes, and support automated testing initiatives, all while ensuring designs meet performance, security and capacity needs across the network. You will be tasked with producing high and low level technical design documentation.

• Ericsson IP STP design and configuration experience
• Ericsson DSC design and configuration experience
• Experience producing high and low level technical design documentation
• Strong working knowledge of Ericsson command structures and documentation
• Experience across cellular networks including 2G, 3G, 4G and IMS
• Proven expertise in signalling protocols such as SS7, SIGTRAN, SIP, Diameter and MAP
The other stuff we are looking for
• Knowledge of capacity modelling and network performance considerations
• Exposure to vendor engagement, including SOR and SOW reviews
• Experience contributing to automated testing approaches within telecoms environments
• Strong collaboration and communication skills across technical and non technical audiences
  
  At Virgin Media O , we connect people to the moments that matter most. Virgin Media leads the UK for broadband reliability, speed and overall performance, while O keeps people connected on the move with award-winning coverage.
We're also proud to be named one of the Financial Times Top 500 Best Employers for 2026, based on one of the UK's largest employee satisfaction surveys. Join us and you'll be part of a team that stays curious, positive and focused on making life easier for our customers and each other. We're investing in the future of connectivity, from expanding next-generation 5G to exploring satellite-supported solutions that help reach rural communities and hard-to-connect places. You'll work with people who back good ideas and give you plenty of room to grow. So if you're looking for a place where you can feel supported, trusted and genuinely valued, you'll feel right at home here. Our ways of working We're a flexible-first organisation, because we know people do their best work when they have choice and clarity. To support meaningful collaboration, we ask everyone to spend at least eight days a month connecting with each other in person. That doesn't just mean time in the office - it could be team meetings, offsites, volunteering days, cross-functional projects, or away days. What matters is making those moments count - so when we come together, it benefits everyone. Accessible, inclusive and equitable for all We believe a better tomorrow starts with the choices we make today. That means moving the dial on diversity, building equity into everything we do and putting inclusion at the heart of our business.Virgin Media O is an equal opportunities employer and we work hard to remove bias and barriers. We want every person who joins us - and everyone thinking about joining us - to feel seen, heard and supported. When you work with us, you'll have access to our award-winning employee network groups. These communities bring people together, champion allyship and create uplifting spaces where you can learn, share and feel part of something bigger. They play a big role in helping people feel connected from day one.

We know life isn't just about work, so our benefits are built to support you in the moments that matter. You'll get Bupa healthcare, wellbeing support, life cover, a pension and generous holiday -plus your birthday off. And there's more. Enjoy some extra perks on us, with optional electric vehicle lease and Cycle2Work schemes, dental insurance, neurodiversity assessments, and brilliant discounts on broadband, TV and mobile. You'll even get access to the Virgin Family platform and the O Priority app, with exclusive rewards, experiences and chances to attend events at The O and beyond. Next steps