Senior Network Engineer (AWS & Python) in City of London, London

Senior Network Engineer
6 Months
London/Hybrid
£580-£630 per day (Inside IR35)
Initially 4 days per week onsite, reducing to 2 days per week onsite over time.

My client in the financial sector are seeking 2 Senior Network Engineers to join a global engineering team supporting a sophisticated, business-critical trading platform.

The organisation operates a complex global technology estate, with network infrastructure connecting data centres, offices, cloud environments and critical trading services. Network availability, resilience, security and low-latency performance are fundamental to its operations.

This is a hands-on senior engineering position offering significant technical ownership across a global production network environment. You will be responsible for network operations, incident management, infrastructure changes, troubleshooting and continuous improvement.

A particular focus will be network automation, using technologies such as Python and Ansible to improve configuration consistency, validation and operational efficiency.

You will work closely with engineering colleagues across London and New York, helping maintain global engineering standards and providing follow-the-sun coverage.

Key Responsibilities

• Take ownership of day-to-day network engineering and operations across global sites, data centres and cloud environments.
• Support and maintain highly available, business-critical network infrastructure.
• Troubleshoot complex network issues across routing, switching, firewall and connectivity layers.
• Own network incidents from initial investigation through to resolution.
• Plan and implement network changes within a controlled production environment.
• Diagnose network performance, connectivity and routing issues.
• Configure, troubleshoot and optimise routing protocols, particularly BGP and OSPF.
• Identify potential network vulnerabilities, points of failure and resilience improvements.
• Support connectivity across data centres, offices and cloud infrastructure.
• Develop network automation using Python and Ansible.
• Work collaboratively with global engineering and infrastructure teams.

Essential Skills & Experience

• Strong background in network engineering within complex enterprise, data centre or production environments.
• Proven ability to support and maintain business-critical network infrastructure.
• Strong technical knowledge of enterprise and data centre networking.
• Hands-on understanding of: BGP, OSPF, Routing and switching
• Network resilience and high availability
• Network troubleshooting and incident resolution
• Ability to manage network changes within highly available production environments.

Desirable Experience

• Experience with AWS networking.
• Knowledge of multicast networking.
• Experience with network automation using Python and Ansible.
• Previous experience within financial services, trading or other low-latency technology environments.
• Experience working within a global 24x7 follow-the-sun engineering model.