Senior Network Engineer

Hamilton; Greater London; On-site; GBP 90,000 - 120,000; Full time

Job summary

Hamilton in London is seeking a Senior Network Engineer to own the enterprise networking and Fortinet security infrastructure across offices, data centres, cloud, and remote-access environments.

You will provide senior technical leadership, manage incidents, drive architecture improvements, and collaborate with Infrastructure, Cloud, Security and Service Management teams to deliver secure, scalable connectivity for Hamilton's global operations.

Qualifications

• Progressive enterprise networking experience, including supporting enterprise firewall and network-security platforms.
• Proven experience as a Senior Network Engineer with ownership of business-critical network infrastructure and security services.
• Demonstrated experience independently owning and supporting an enterprise Fortinet environment, including operational health, technical standards, lifecycle management, security controls, incident resolution, vendor escalation, and documentation.
• Advanced hands-on experience with FortiGate, FortiSwitch, FortiClient VPN and EMS, FortiAnalyzer, Fortinet Security Fabric, and high-availability technologies.
• Strong experience supporting Cisco Nexus routing and switching, with expert knowledge of BGP, OSPF, static and policy-based routing, VLANs, QoS, NAT, DNS, DHCP, IP address management, and segmentation
• Experience designing, implementing, and supporting secure enterprise network architectures across on-premises, Azure, and hybrid-cloud environments
• Experience with network automation and infrastructure as code using PowerShell, Python, Terraform, Ansible, APIs, Git, and CI/CD tooling
• Experience with enterprise monitoring, logging, diagnostics, reporting, and SIEM integration
• Experience participating in disaster recovery exercises, resilience testing, recovery validation, and business continuity initiatives
• Strong understanding of ITIL-aligned incident, problem, change, and service-management practices

Responsibilities

• Server as the primary technical owner of Hamilton's global enterprise network and Fortinet security platforms across offices, data centres, cloud, and remote-access environments.
• Lead incidents and major changes, including firmware upgrades and hardware refreshes through change controls.
• Design, implement, and support enterprise routing and switching solutions using Cisco and Fortinet technologies.
• Maintain high availability connectivity between offices, cloud platforms, data centres, and third parties.
• Lead root-cause analysis of complex connectivity and performance issues.
• Design and maintain secure network architectures aligned with best practice and regulatory requirements.
• Mentor engineers and lead technical workstreams with minimal supervision, including after hours.

Skills

Enterprise networking

Network security

Fortinet FortiGate

Cisco Nexus

Network automation

PowerShell

Python

CI/CD tooling

Monitoring & SIEM

Tools

FortiGate

FortiSwitch

FortiClient VPN

FortiAnalyzer

Fortinet Security Fabric

Cisco Nexus

Azure

Terraform

Ansible

Git

SNMPv3

Job description

Description

Hamilton (NYSE: HG) underwrites specialty insurance and reinsurance risks on a global basis through its wholly owned subsidiaries. Its three underwriting platforms: Hamilton Global Specialty, Hamilton Select and Hamilton Re, each with dedicated and experienced leadership, provide access to diversified and profitable business around the world.

Headquartered in Bermuda, Hamilton has more than 600 employees with key underwriting operations in London, Bermuda, the US and Dublin. We work collaboratively, we share a passion for the service and results we deliver, and we know that what we do each day is meaningful – to our customers and our business. We believe we are ‘In good company.’ with everyone we interact with.

We're looking for a Senior Network Engineer

Based in London, UK and reporting to the Global Head of IT Operations & Chief Information Security Officer, the Senior Network Engineer will be the primary technical owner of Hamilton's enterprise networking and Fortinet security infrastructure across office, data centre, cloud, and remote-access environments.

The role provides senior technical leadership and independent ownership of network operations, security, resilience, and improvement initiatives, working closely with Infrastructure, Cloud, Security, Application, and Service Management teams to deliver secure, scalable networking that supports Hamilton's global operations and regulatory obligations.

What you will do

Network Infrastructure & Security Operations

• Serve as the primary technical owner of Hamilton's global enterprise network and Fortinet security platforms, including FortiGate, FortiSwitch, FortiClient VPN and EMS, FortiAnalyzer, and Security Fabric
• Ensure the availability, performance, security, and resilience of network services across data centres, offices, cloud, and remote-access platforms, monitored through LogicMonitor, FortiAnalyzer, SNMPv3, syslog, and NetFlow
• Provide senior technical leadership during incidents and major changes, including firmware upgrades, hardware refreshes, migrations, and certificate renewals through established change controls
• Routing, Switching & Connectivity
• Design, implement, and support enterprise routing and switching solutions using Cisco and Fortinet technologies, including BGP, OSPF, VLANs, QoS, NAT, DNS, DHCP, and segmentation
• Maintain highly available connectivity between offices, cloud platforms, data centres, disaster recovery locations, and third parties, and lead root-cause analysis of complex connectivity and performance issues

Network Security Engineering

• Design, implement, and maintain secure network architectures aligned with industry best practice and regulatory requirements
• Lead firewall policy governance, rule reviews, security-zone design, and segmentation initiatives, and maintain site-to-site and remote-access VPNs, certificates, authentication, and logging
• Investigate complex VPN, routing, IPS, HA failover, and firmware issues, including vendor escalation, and partner with Information Security on vulnerabilities, penetration-test findings, and audit observations

Cloud, Automation & Storage Networking

• Design and support Azure and hybrid-cloud networking, including virtual FortiGate, route tables, network security groups, and VPN connectivity, in collaboration with Cloud Engineering
• Develop automation using PowerShell, Python, Terraform, Ansible, APIs, Git, and CI/CD pipelines for configuration management, backups, monitoring, and compliance validation
• Drive continuous improvement and engineering standards, support NetApp storage networking (SAN, iSCSI, Fibre Channel), and evaluate emerging technologies

Operational Resilience, Governance & Leadership

• Support disaster recovery, business continuity, and resilience initiatives through design reviews, testing, failover exercises, and recovery validation
• Maintain runbooks, architecture diagrams, IPAM data, and recovery procedures, ensuring changes comply with change, security, audit, and regulatory procedures, and provide technical evidence for audits and regulatory reviews
• Act as the senior escalation point for complex network issues, mentor engineers, and lead technical workstreams with minimal supervision, including after hours and maintenance windows

Requirements

What you require for the role

• Progressive enterprise networking experience, including supporting enterprise firewall and network-security platforms
• Proven experience as a Senior Network Engineer with ownership of business-critical network infrastructure and security services
• Demonstrated experience independently owning and supporting an enterprise Fortinet environment, including operational health, technical standards, lifecycle management, security controls, incident resolution, vendor escalation, and documentation
• Advanced hands-on experience with FortiGate, FortiSwitch, FortiClient VPN and EMS, FortiAnalyzer, Fortinet Security Fabric, and high-availability technologies
• Strong experience supporting Cisco Nexus routing and switching, with expert knowledge of BGP, OSPF, static and policy-based routing, VLANs, QoS, NAT, DNS, DHCP, IP address management, and segmentation
• Experience designing, implementing, and supporting secure enterprise network architectures across on-premises, Azure, and hybrid-cloud environments
• Experience with network automation and infrastructure as code using PowerShell, Python, Terraform, Ansible, APIs, Git, and CI/CD tooling
• Experience with enterprise monitoring, logging, diagnostics, reporting, and SIEM integration
• Experience participating in disaster recovery exercises, resilience testing, recovery validation, and business continuity initiatives
• Strong understanding of ITIL-aligned incident, problem, change, and service-management practices

Preferred Qualifications

• Fortinet Certified Professional (FCP), Fortinet Certified Solution Specialist (FCSS), or equivalent Fortinet certification
• Cisco CCNP Enterprise, CCNP Security, or equivalent certification
• Microsoft Certified: Azure Network Engineer Associate or equivalent Azure networking certification
• Experience working within financial services, insurance, or another regulated enterprise environment is a plus
• Experience supporting global, multi-region infrastructure environments

Knowledge, Skills & Personal Attributes

• Exceptional troubleshooting and analytical skills, including packet-flow analysis, log review, root-cause analysis, and permanent corrective action
• Strong understanding of network-security principles and defence-in-depth architectures
• Strong documentation, communication, vendor-management, and stakeholder-management skills, with the ability to translate complex technical concepts into clear business-focused recommendations
• Self-motivated, accountable, and proactive, able to manage multiple priorities independently and remain calm under pressure during critical incidents
• Collaborative, with a commitment to continuous learning and technical excellence

Benefits

What you can expect from us

At Hamilton, we offer a vibrant, entrepreneurial and collaborative workplace shaped by our values: Be Smart, Be Sensible, Be Open and Be More.

Our employees consistently say they would recommend Hamilton as a great place to work - a testament to the inclusive, supportive, and empowering culture we’ve built together. We embrace individuality, value diverse perspectives, and recognise the unique contribution each person makes to our continued success.