VodafoneThree - Senior Engineer Mobile Voice

About the job

Location: Newbury+ Hybrid
Salary: Excellent basic salary plus bonus and Vodafone benefits
Working hours: Full time 37.5 hours per week – Monday to Friday
Hybrid
We believe that through collaboration and connection with our colleagues we can achieve great things. Our hybrid working approach allows our people to work both in the office and at home, providing the flexibility and resources you need to succeed in your role. We don't require you to be in on specific days; instead, we ask people to come into the office 2-3 days each week, for at least 8 days per month. You should work with your line manager to understand what their expectations are for you, your specific role and your team.

Who We Are
We’re here to build a network the UK can count on – one that connects people, places and potential. Because no matter where you live, what your background is, or how you get online – we think everyone deserves the same chance to stay connected, and with VodafoneThree, that future’s being built – today.
We’re creating more than the UK’s best network. We’re helping close the digital divide, empower communities and drive meaningful progress.
We believe that everyone should feel they belong. Whoever you are and whatever your story, there’s space for you here. We’re building a workplace where different perspectives are welcomed, voices are heard, and everyone feels safe to show up as themselves.
You’ll join a team that genuinely cares – about each other, about our customers, and about the future we’re building. From day one, you’ll be welcomed, valued and encouraged to bring your whole self to work.
Why VodafoneThree
Join us and you’ll be at the heart of change. That means building responsibly, investing sustainably and creating opportunities that last.
We’re not just expanding connectivity; we’re reimagining what a connected nation looks like. With £11bn invested in 5G and digital infrastructure, your work will directly power businesses, services, and communities across the country.
You’ll work on real challenges, with real impact, across every corner of the country. Wherever you join us, whatever your role, you’ll be helping to build a future that works better for everyone.
We move at pace, because what we’re building matters – and we’re learning as we go. We’re proud of the progress we’ve made, but we’re just getting started.
Join our Technology team and push the boundaries of tech to make a better world today and create the ground-breaking products and services of tomorrow.

What you’ll do
In this role, you'll take ownership of Mobile Voice capabilities across their full lifecycle, from architecture and design through to delivery, optimisation, and continuous improvement. You'll combine deep technical expertise with collaboration and strategic thinking to help deliver reliable, high-performing services while supporting the organisation's transformation journey.

• You'll take end-to-end technical ownership of Mobile Voice capabilities, ensuring solutions are stable, resilient, scalable, and aligned to business objectives.
• You'll design, review, implement, and optimise voice network solutions, ensuring they meet agreed performance, quality, and security standards.
• You'll provide technical leadership across IMS Core technologies, including VoLTE, VoWiFi, and multi-generation mobile network environments spanning 2G, 3G, 4G, and 5G.
• You'll contribute to the development and optimisation of key network elements across signalling, IMS, infrastructure, mediation, provisioning, and Release 4 network environments.
• You'll support the creation, review, and governance of High-Level Designs (HLDs), Low-Level Designs (LLDs), and development artefacts, ensuring architectural consistency and technical excellence.
• You'll work closely with security specialists to ensure solutions remain compliant with internal standards, regulatory obligations, and evolving security requirements.
• You'll partner with Network, IT, Security, Operations, Commercial, and vendor teams to deliver integrated and effective solutions.
• You'll act as a trusted technical advisor, providing guidance, insight, and expertise to colleagues, stakeholders, and delivery partners.
• You'll contribute to major transformation programmes, including cloud migration, network modernisation, and platform consolidation initiatives.
• You'll proactively manage system capacity, performance, availability, and reliability to support growing customer and business demands.
• You'll drive continuous improvement through automation, CI/CD adoption, process optimisation, performance analytics, and modern engineering practices.
• You'll review third-party supplier proposals and technical solutions, ensuring value for money, commercial awareness, and technical robustness.
• You'll support governance activities, performance reviews, and quality assurance processes with partners and vendors.
• You'll act as an escalation point for complex technical challenges, leading structured root cause analysis and supporting long-term resolution strategies.
• You'll help shape future technology roadmaps and contribute to strategic decisions that enhance customer experience and operational excellence.

Who you are

• You’ll bring 5+ years' experience within the mobile telecommunications industry.
• You’ll have strong expertise in IMS Core architecture and mobile voice technologies, including VoLTE, VoWiFi, and 2G, 3G, 4G, and 5G network environments.
• You’ll have experience designing, reviewing, and governing complex telecom network solutions within large-scale organisations.
• You’ll understand signalling technologies such as SS7 STP/SGW, SS7 Firewalls, DSC, and 5G Service Communication platforms.
• You’ll have hands-on knowledge of IMS network elements including TAS, CSCF, SBC/SBG, BGF, MRFP, AFG/Ut Proxy, and ENUM/DNS.
• You’ll be comfortable working across cloud, virtualised, and network infrastructure environments, including technologies such as VMware, OpenStack, and Kubernetes.
• You’ll have experience contributing to network transformation, cloud migration, modernisation, or consolidation programmes.
• You’ll be confident reviewing and constructively challenging designs, vendor proposals, architectural decisions, and technical solutions.
• You’ll understand the importance of regulatory compliance, security obligations, lawful interception requirements, emergency call services, and data protection standards.
• You’ll bring strong analytical and problem-solving skills, with the ability to identify root causes and develop practical, scalable solutions.
• You’ll be able to balance technical excellence with commercial awareness, understanding the impact of CAPEX, OPEX, delivery timelines, and business priorities.
• You’ll communicate complex technical concepts clearly and effectively to both technical and non-technical audiences.
• You’ll enjoy building trusted relationships and collaborating across diverse teams, partners, and stakeholders.
• You’ll be proactive, adaptable, curious, and motivated to learn, improve, and help others succeed.
• You’ll thrive in an environment where teamwork, innovation, accountability, and continuous improvement are equally valued.

Worried that you don’t meet all the desired criteria exactly?
We know that everyone is unique, with multiple aspects to their identity and different experiences behind them. We are passionate about Inclusion for All and creating a workplace where everyone can thrive, whatever their personal or professional background. If you’re excited about this role but your experience doesn’t align exactly with every part of the job description, we encourage you to apply as you may be the right candidate for this role or another role, and our recruitment team can help you see how your skills fit in.