Senior Network Operations Support Engineer - freelance - hybrid, London, UK

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Reports to Head of Data Centre and Network Services. Responsibilities: Provide 24/7 operational support, leading incident response, root cause analysis, and permanent remediation across enterprise and data centre networks. Troubleshoot complex L2–L7 issues across routing, switching, Palo Alto/ Fortinet firewalls, Cisco ACI, and hybrid cloud connectivity. Manage network and firewall changes end-to-end, including risk assessment, rollback planning, and documentation. Monitor and optimise network health, capacity, and performance; drive continuous improvement of tooling, dashboards, and automation. Collaborate with engineering, architecture, and cybersecurity teams to support new deployments and enforce security standards. Maintain operational documentation, ensure regulatory compliance, and report on availability metrics and KPIs. Coordinate with vendors, telcos, and internal stakeholders on fault resolution and SLA management. Requirements 8–12+ years in enterprise/data centre network operations. Strong L2–L7 troubleshooting skills: BGP, OSPF, EIGRP, QoS, WAN, MPLS, SD-WAN. Hands-on experience with Cisco ACI, Palo Alto (Panorama), and Fortinet (FortiManager/FortiAnalyzer). Python and Ansible automation skills for operational workflows and API-driven tasks. Familiarity with AWS/Azure networking and hybrid cloud environments. Experience in regulated industries with strong change governance and compliance practices. Clear communicator with solid documentation and cross-team collaboration skills.