Mobile Core Design Specialist - Gateway and Services (3GPP)

TL;DR

Mobile Core Design Specialist (3GPP/IP Routing): Designing and configuring customer-facing mobile data services and platforms like SGW, PGW, and SMF with an accent on cloud-native core integration and 5G features. Focus on authoring high-level and low-level designs, optimizing IP routing via Juniper/Cisco, and integrating RADIUS for authentication.

Location: GBR Bristol - Assembly

Company

hirify.global is the UK's leading communications group and the holding company behind brands including BT, EE, Openreach, and Plusnet.

What you will do

• Author High Level and Low Level Design documents, configuration guides, and sequence flows.
• Lead the design for customer-facing services and platforms such as SGW, PGW, SMF, UPF, DNS, Gi LAN, and CGNAT.
• Liaise with vendors and suppliers to implement, upgrade, and bring in new network solutions.
• Analyze logs and packet traces to identify the cause of technical issues and resolve them.
• Measure capacity and traffic profiles of services to ensure network stability and performance.
• Provide specialist consultancy to stakeholders and mentor Network Design Professionals and Apprentices.

Requirements

• Must be based in or have the right to work in the UK (Location: Bristol).
• Several years of experience designing/operating 3GPP 4G packet core components (e.g., MME, SGW, PGW, PCRF, Gi LAN, ePDG).
• Strong hands-on experience with IP routing in Juniper and/or Cisco environments.
• Proven integration and operational experience with RADIUS authentication and accounting systems.
• Ability to create complex technical documentation, including Use Cases, Sequence Flows, and Flow Charts.
• Strong verbal and written communication skills for interacting with both technical and non-technical audiences.

Nice to have

• Knowledge of 3GPP releases 16 & 17.
• Experience with cloud computing technologies such as Openstack, Docker, Kubernetes, and Microservices.
• Proven experience with Juniper and Cisco routing in ISP or enterprise environments.
• Strong stakeholder management and negotiation capabilities.

Culture & Benefits

• 10% on-target bonus and comprehensive BT Pension scheme.
• Equal family leave: 18 weeks at full pay, 8 weeks at half pay, and 26 weeks at statutory rate.
• 25 days annual leave plus bank holidays.
• 24/7 private virtual GP appointments and enhanced women's health support for UK colleagues.
• World-class training and development opportunities.