Network Security Support Engineer

Network Security Support Engineer Location: London (Hybrid - 2 days onsite per week) Contract: 12-Month Fixed-Term Contract Clearance: Active SC Clearance Required Overview We are seeking an experienced Network Security Support Engineer to join a highly skilled security engineering team responsible for maintaining and supporting enterprise network security services. This role will focus on ensuring the availability, security, and operational stability of critical network security platforms, with particular emphasis on firewall and secure access technologies. This is an excellent opportunity for a security professional with strong firewall administration and troubleshooting experience who enjoys working within complex enterprise environments. Key Responsibilities Support and maintain enterprise network security platforms and firewall infrastructure. Manage and resolve incidents, service requests, and technical issues through to successful completion. Investigate and troubleshoot network and security-related problems using logs, monitoring tools, and traffic analysis techniques. Implement and validate firewall policy changes and security configurations in production environments. Perform root cause analysis for recurring incidents and recommend preventative improvements. Work closely with internal technical teams, third-party vendors, and managed service providers. Maintain technical documentation, operational procedures, and knowledge articles. Contribute to service improvements, platform optimisation, and operational best practices. Support platform maintenance activities, upgrades, patching, and vulnerability remediation. Required Skills