Network Engineer

MARGO; London; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A leading investment banking firm in London is seeking a Senior Network Engineer to lead an infrastructure transformation project. The ideal candidate will focus on network automation, improve latency and scalability, and work with developers to redesign the network. Strong experience in low-latency trading environments is required. This role offers a hybrid working model, with three days in the office.

Qualifications

• Proven experience in low-latency, high-availability trading environments.
• Strong hands-on knowledge of Arista network equipment and architecture.
• Proficiency in network automation, especially using Ansible.

Responsibilities

• Design, document, and deploy new infrastructure using network-as-code principles.
• Serve as the senior escalation point for trading network issues.
• Collaborate with global peers and vendors for implementation and upgrades.

Skills

Low-latency trading environment experience

Network automation using Ansible

Hands-on knowledge of Arista equipment

Deep knowledge of routing protocols (OSPF, BGP)

Education

CCIE certification or equivalent experience

Tools

Packet-level analysis tools

Job description

We are seeking a Senior Network Engineer to join an exciting infrastructure transformation project within a leading investment banking environment. After years of organic growth, the trading network is now undergoing a major overhaul with fresh investment focused on latency-sensitive electronic trading systems.

This is an opportunity to drive real architectural change, implement automation, and work closely with developers and application teams to redesign the network for performance, scalability, and resilience.

Location: Hybrid, London (3 days per week in office)

Your mission:

You’ll join a tight-knit, agile team with broad responsibilities across the trading and corporate networks. Your focus will be to:

Drive network automation using tools like Ansible

Re-architect the network to improve latency and scalability

Act as the bridge between infrastructure and trading/application teams

Ensure stable operations and lead troubleshooting in production environments

️ What you'll bring:

Proven experience in low-latency, high-availability trading environments

Strong hands-on knowledge of Arista network equipment and architecture

Proficiency in network automation, especially using Ansible

Deep knowledge of routing protocols (OSPF, BGP) and IP transmission (Unicast/Multicast)

Experience working with market brokers and direct market connectivity

Strong skills in packet-level analysis and root cause troubleshooting

Ability to capture business/application needs and translate them into technical solutions

Previous exposure to firewalls, proxies, load balancers (LTM/Web Gateway)

Nice to have:

CCIE certification or equivalent experience

Key responsibilities:

Design, document, and deploy new infrastructure following "network-as-code" principles

Own high- and low-level design (HLD/LLD) and support knowledge sharing with global ops teams

Serve as the senior escalation point for London-based trading network issues

Collaborate with global peers and vendors to manage implementation and upgrades

Support and optimise monitoring, capacity planning, and incident response

Recruitment process:

Intro call with our Talent Acquisition team

Technical interview

Final meeting with the engineering and project leads

Apply now:

As an employer, MARGO offers equal employment opportunities regardless of gender, ethnicity, religion, sexual orientation, social status, disability, or age. MARGO is committed to fostering an inclusive work environment that reflects the diversity of its teams, and several actions are taken daily to achieve this!