Senior Network Engineer
This is a high-impact engineering role within a globally recognised financial services environment, focused on delivering a large-scale Data Centre Transformation programme.
You’ll join a core network team responsible for modernising critical infrastructure following a major separation programme, giving you exposure to end-to-end network ownership across design, build, migration, and production rollout.
The team operates in a hands-on, engineering-led environment, where you’ll work across complex enterprise networks, contribute to key transformation initiatives, and play a direct role in shaping the future state of the organisation’s infrastructure.
This is ideal for someone who wants to move beyond BAU and be part of meaningful, business-critical change, with strong visibility and ownership.
Responsibilities:
• Design, build, and implement enterprise network solutions
• Deliver across a major data centre transformation programme
• Support network migrations, optimisation, and traffic engineering
• Decommission legacy infrastructure and consolidate services
• Configure and manage routing, switching, and firewall technologies
• Own network performance, stability, and continuous improvement
• Produce technical documentation including runbooks and handovers
• Collaborate with cross-functional teams across infrastructure and operations
• Support planned migration activities (including occasional weekend work)
Technical Environment:
• Cisco Data Centre networking technologies
• Enterprise routing and switching
• Fortinet / FortiGate firewalls
• Multi-vendor environments (Cisco, Juniper)
• Large-scale enterprise network infrastructure
• Data centre environments and migrations
Skills / Must Have:
• Strong experience with Cisco Data Centre technologies
• Solid Routing & Switching expertise (CCNP level or equivalent)
• Proven ability to configure and troubleshoot enterprise-grade networks
• Hands-on experience with Fortinet / FortiGate firewalls
• Strong understanding of network security principles
• Ability to operate both independently and within a team
• Experience working in complex, large-scale environments
Nice to Have:
• Experience with Juniper networking technologies
• Exposure to Palo Alto firewalls
• Background in financial services or regulated environments
Working Pattern:
• London – Hybrid working
• 3 days onsite (likely reducing to 1–2 days)
• Occasional data centre visits
Benefits:
• Work on a business-critical transformation programme
• High ownership within a core engineering team
• Exposure to large-scale, complex network environments
• Strong visibility across infrastructure and leadership teams
Salary
• Up to £70,000 base salary DOE
• Competitive package depending on experience
Employer:
A globally recognised financial services technology organisation, delivering critical infrastructure and post-trade solutions to leading institutions across capital markets, currently undergoing a major network and data centre transformation.