Senior Network Engineer

Entasis Partners; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Job summary

Entasis Partners is seeking a Senior Network Engineer in London to own and automate a global network spanning data centres, offices, and cloud. You will ensure fast, resilient trading connectivity and lead incident response with a focus on root cause fixes.

The role demands expertise in BGP/OSPF, security tooling, and hands-on automation. You will work in a 3 days per week onsite model with a follow-the-sun support mindset, collaborating with international engineering teams and mentoring less

Qualifications

• 7+ years in enterprise or data centre networking.
• Advanced routing with BGP/OSPF.
• Hands-on security tooling with Palo Alto/Zscaler.
• Automation implemented with Python and/or Ansible.
• Calm, methodical troubleshooting where downtime isn’t an option.
• Experience in finance: hedge fund, bank, exchange or electronic trading.
• Experience with low-latency designs, multicast or market data feeds.
• AWS networking familiarity: Transit Gateway, Direct Connect.

Responsibilities

• Own a global network spanning data centres, offices and cloud.
• Keep trading connectivity fast, resilient, and stable under pressure.
• Lead responses to incidents and fix root causes, not symptoms.
• Replace manual network changes with automation using Python/Ansible.
• Collaborate with global engineering teams and mentor junior engineers.

Skills

Enterprise networking

Routing (BGP/OSPF)

Security tooling

Automation (Python/Ansible)

Troubleshooting

Industry experience (hedge fund/trades

Low-latency design

AWS networking

Follow-the-sun support

Job description

Senior Network Engineer | Global hedge fund | London, 3 days onsite | inside IR35

When the network is the trading platform, every millisecond and every change counts. We’re looking for a senior engineer who can own it, automate it and keep it fast.

The essentials

Location: Central London, 3 days a week in the office

Start: immediate

Who you’ll be working for

A global hedge fund with a systematic trading business that runs around the clock. Technology is central to how they make money, and they hold their engineers to a high standard. The network team is expanding its global footprint, and this hire will be a senior voice within it.

Where you’ll make an impact

• Taking ownership of a global network spanning data centres, offices and the cloud
• Keeping trading connectivity fast, resilient and stable under pressure
• Stepping in to lead when incidents hit, and fixing root causes, not symptoms
• Replacing manual network change with Python and Ansible automation
• Working closely with engineering teams worldwide and helping develop less experienced engineers

What you’ll bring

• A solid track record in enterprise or data centre networking, typically 7+ years
• Routing expertise, especially BGP and OSPF, well beyond the basics
• Hands-on security tooling experience with Palo Alto firewalls and Zscaler
• Automation you’ve actually shipped, using Python, Ansible or both
• Calm, methodical troubleshooting in environments where downtime is not an option
• Time in a hedge fund, bank, exchange or electronic trading firm
• Experience with low-latency design, multicast or market data feeds
• AWS networking, particularly Transit Gateway and Direct Connect
• Working within a follow-the-sun support model

Entasis Partners is an equal opportunities employer. We welcome applications from everyone and will make reasonable adjustments on request.