Senior Network Engineer - Fintech

The Opportunity We're working with a leading global FinTech organisation that is looking to hire a Senior Network Engineer into its London engineering team. This is a senior hands-on position covering the design, implementation and ongoing engineering of business-critical network infrastructure supporting a highly available, performance-sensitive financial environment. You'll work alongside senior engineers globally and take ownership across both engineering and large-scale network projects. Key Responsibilities

• Design, implement and support enterprise and data centre network infrastructure
• Engineer and manage Arista environments, including deployments through Arista CloudVision
• Work across routing, switching, firewalls, load balancing and DNS
• Support CDN and DDoS infrastructure, including platforms such as Akamai / Prolexic
• Contribute to the organisation's migration of workloads into public cloud environments
• Work on new data centre connectivity and infrastructure deployments
• Troubleshoot complex network and performance issues across production environments
• Contribute to network automation and operational tooling
• Work closely with global engineering teams on architecture, standards and technical improvements
• Support highly available and latency-sensitive financial systems

Core Requirements

• Strong senior-level Network Engineering experience
• Excellent routing and switching fundamentals
• Strong hands-on Arista experience
• Load balancing experience, ideally F5
• Strong understanding of DNS
• CDN experience, ideally Akamai / Prolexic
• Firewall and network security experience
• Experience designing and implementing networks rather than purely supporting them
• Background working within complex, highly available production environments Highly Desirable
• Financial Services, FinTech or electronic trading experience
• Public cloud networking experience across AWS, Azure and/or GCP
• Experience with Arista CloudVision
• Ultra-low-latency networking exposure
• DDoS mitigation experience
• Network automation using Python, Ansible or similar
• AIOps / AI-driven network operations exposure Why Join? This is an opportunity to join at a particularly interesting point in the network team's roadmap. Rather than purely maintaining an established environment, you'll have the chance to contribute to major cloud, data centre and low-latency infrastructure projects while working within a global FinTech environment.