Senior Network Engineer – FinTech

Hamilton Barnes ?; City Of London; On-site; GBP 90,000 - 140,000; Full time

Job summary

Hamilton Barnes is recruiting a Senior Network Engineer for its London engineering team to design, implement and support high-availability network infrastructure in a financial services context. You will work with global peers, own key network projects, and focus on Arista environments, data centre connectivity, cloud migrations and performance optimization.

The role emphasizes hands-on engineering across routing, switching, firewalls, DNS and CDN/DDOS platforms, with strong production

Qualifications

• Senior-level network engineering experience.
• Experience designing and implementing networks in complex environments.
• Hands-on design, deployment and operation of enterprise data-centre networks.

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 (Akamai/Prolexic).
• Contribute to workloads migration into public cloud environments.
• Work on new data centre connectivity and infrastructure deployments.
• Troubleshoot complex network and performance issues in production.
• Contribute to network automation and operational tooling.
• Collaborate with global engineering teams on architecture and standards.
• Support highly available and latency-sensitive financial systems.

Skills

Senior Network Engineering

Routing & Switching

DNS

Firewall & Security

Cloud Networking

Network Automation

Tools

Arista CloudVision

Akamai/Prolexic

F5

Job description

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
• 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
• 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.