Job Title: Senior Network Engineer (Network & Security Operations) Location: Hybrid London (Onsite 3 days per week) Type: Full-Time, Permanent Salary: £60,000 Benefits We are seeking an experienced Senior Network Engineer to join a growing network operations team, providing senior-level support across complex enterprise network and security environments. This role is focused on BAU support, troubleshooting, and operational stability, supporting critical customer infrastructure. You will act as a senior escalation point within the team, supporting secure, resilient LAN, WLAN, and network security platforms, while helping to drive service quality and continuous improvement. What Youll Be Doing As a senior technical specialist within the network operations function, youll be responsible for maintaining, supporting, and optimising live enterprise networks and security platforms. Key responsibilities include: Providing 3rd-line support and escalation for complex network and security incidents Supporting and maintaining Cisco Security technologies, including: ASA, FirePOWER, FTD & FMC Cisco ISE (NAC, identity and policy enforcement) Cisco Umbrella Cisco DNA Center (DNAC) Supporting enterprise LAN environments (Cisco Catalyst switching) Supporting and troubleshooting enterprise WLAN environments, including controllers and access points Managing P1 incidents, including RCA and remediation Diagnosing issues across routing, switching, wireless and security domains Performing configuration changes, upgrades, patching and routine maintenance Monitoring network performance, availability and security posture Creating and maintaining operational documentation, runbooks and knowledge articles Providing technical guidance and mentorship to junior engineers What Youll Bring Required Experience & Skills: 5 years experience supporting enterprise network and security environments Strong hands-on experience with Cisco Enterprise Networking Technologies. Strong enterprise networking experience across LAN and routing/switching Experience operating as a senior / 3rd-line engineer Excellent troubleshooting and problem-solving skills Nice to Have: Exposure to Cisco Software Defined technologies, SD Access, ACI, Nexus etc. (Training will be provided) Exposure to network monitoring and management tools Cisco certifications (CCNP Enterprise, CCNP Security or equivalent) Experience within managed services or enterprise operations teams What Youre Like Operationally focused and calm under pressure Customer- and service-driven, with a strong uptime mindset Clear communicator with strong documentation habits Detail-oriented and proactive Enjoys mentoring and supporting team development Why Join Us? Youll be joining a collaborative, operations-focused team responsible for mission-critical enterprise networks, working with modern Cisco networking and security technologies. The role offers long-term technical growth, stability, and the flexibility of a fully home-based position .