Senior Network Design Engineer - HS

At Siemens Mobility, we are transforming rail infrastructure through innovative signalling, communications, control and electrification systems. Within our Communications & Information Systems (CIS) business, we deliver mission‑critical Network, Telecoms and Security solutions supporting operational railway systems across the UK and beyond.

HS2 is one of Europe’s largest infrastructure programmes and will deliver a high‑speed railway connecting London and the West Midlands. Siemens Mobility has been awarded contracts covering key rail systems, including Operational Telecommunications and Security Systems for the HS2 route. The role requires robust technical coordination, clear system definition, evidence‑based assurance and close alignment with HS2 requirements, interfaces and review processes, while also supporting wider network design activities across the CIS business.

The Senior Network Design Engineer is responsible for leading and supporting network, telecoms and security design activities across HS2 and wider network programmes. This includes defining, assuring and developing secure, resilient architectures supporting operational telecommunications, security systems, voice services, data networks, station and route‑wide communications, and interfaces with Signalling, SCADA, M&E, station systems and wider railway control systems.

Working closely with HS2, project engineering, delivery partners, system integration teams, multidisciplinary design teams and the wider networks team, the role ensures that solutions are developed safely, securely and efficiently, with clear requirements traceability, interface control, design governance and acceptance evidence throughout the project lifecycle.

• Undertake the role of Senior Engineer, providing technical leadership across HS2 network, operational telecommunications and security system design activities, with additional support to wider network design work where required.
• Lead the development of high‑level and low‑level architectures for secure, resilient and maintainable telecoms and security systems.
• Act as Responsible Engineer or independent checker where assigned, ensuring outputs are technically robust and suitable for client review.
• Support requirements management, including allocation, interpretation, compliance evidence and traceability within HS2 requirements processes.
• Coordinate design interfaces with Signalling, SCADA, M&E, station systems, security systems, civil infrastructure and other rail systems packages.
• Support IDC, IDR and other assurance review cycles by preparing design evidence, responding to comments and managing technical close‑out.
• Produce architecture diagrams, system descriptions, interface information, design reports, technical specifications and assurance documentation.
• Define IP addressing, subnetting, network segmentation, resilience and cyber security strategies appropriate to an operational railway environment.
• Support system integration, testing, commissioning, migration and maintainability considerations for HS2 and wider network systems.
• Apply CDM 2015 and Safe by Design principles by identifying design hazards, managing residual risks and communicating safety‑related assumptions and constraints.

• Operational data networks, LAN/WAN infrastructure and associated routing, switching and resilience arrangements.
• Telecommunications services including voice, bearer network interfaces, operational communications and route‑wide connectivity.
• Server/ Hypervisor build and deployment.
• Integration with HS2 and wider rail systems, including station systems, control systems, SCADA, signalling and operational railway management arrangements.