Senior Network Engineer in City of Westminster

About the Role

We’re looking for a hands‑on Senior Network Engineer who is proactive, practical, and thrives on solving problems. This is not a role for someone who sits back and waits for direction - we need someone with strong technical depth, common sense, and the confidence to get stuck in, take ownership, and drive solutions through to completion. You’ll play a key role in shaping and evolving Serco’s enterprise network services, working across multi-cloud environments, core connectivity, security, and operational delivery. Acting as a technical lead within the Network Service, you’ll work closely with internal teams, strategic partners, and operational stakeholders to ensure our network infrastructure remains secure, scalable, performant, and fit for purpose.

Key Responsibilities

• Lead the technical design, engineering configuration, and strategic evolution of Serco’s enterprise network services.
• Design and support secure multi‑cloud networking solutions across AWS and Azure environments.
• Work closely with Product Owners, Solution Architects, operational teams, and third‑party suppliers to deliver robust network solutions.
• Produce and maintain high‑quality architecture documentation including HLDs, LLDs, and network diagrams.
• Drive continual improvement across network performance, resilience, security, and service adoption.
• Support operational teams in troubleshooting complex network issues and identifying long‑term solutions.
• Develop short and long‑term technology roadmaps to ensure services remain current, scalable, and aligned to business needs.
• Support new service introductions through technical analysis, deployment planning, cost modelling, and implementation coordination.
• Ensure network services align with security best practice, including zero‑trust principles and secure government/regulated environments.
• Build strong relationships with stakeholders, suppliers, and business teams across a large matrix organisation.

Qualifications & Experience

• 5+ years’ experience in a senior network engineering or network design role.
• Strong hands‑on experience across enterprise networking technologies including AWS networking, Azure networking, Cisco Meraki technologies, and network security technologies.
• Experience working within regulated or government secure environments (highly desirable).
• Knowledge of carrier WAN technologies including MPLS, leased lines, and managed connectivity services.
• Experience working within architectural frameworks such as TOGAF.
• Strong experience producing HLDs, LLDs, technical architecture documentation, and network diagrams.
• Experience managing and working collaboratively with suppliers, partners, and third‑party operational teams.
• Strong troubleshooting, operational support, and problem‑solving capability within complex enterprise environments.
• Relevant certifications desirable, including CCNP Enterprise, AWS Advanced Networking – Specialty, Azure Network Engineer Associate, and Palo Alto PCNSE/Prisma certifications.
• Availability for occasional out‑of‑hours support or escalation cover as some environments operate 24/7.

Why You’ll Make an Impact

Your work is vital to the business, supporting decisions and growth across five vital sectors in a global organization. You’ll join a highly motivated, supportive environment with experienced colleagues who strive for excellence.

Benefits

• Flexible working
• Pension – 6% contribution
• Chance to contribute to innovation in public services
• Strong commitment to diversity and inclusion
• Serco employee discounts (cinema, merlin entertainment, online shopping, mobile phone plans, leisure centre memberships)
• Health and wellbeing support: Employee Assistance Programme, Simply Health Cash Plans, and more
• Career development training: role‑specific training, leadership coaching, formal study, and more
• Safe and supportive culture