Network Security Engineer - Night Shift | Remote | 6-Month Contract Location: UK Remote (Candidates must be resident in the UK) Duration: 6 Months Shift Pattern: Nights Only - Expected 4 On / 4 Off, 12-Hour Shifts (5:30pm-5:30am) - TBC IR35: Inside IR35 - Umbrella Company We are looking for experienced Network Security Engineers to support a major cybersecurity vulnerability remediation and infrastructure patching programme within a large enterprise environment. This is a hands-on engineering role involving firewall, security infrastructure and access control platform patching during planned overnight maintenance windows. Key Responsibilities Implement security platform patches, firmware upgrades and vulnerability remediation changes. Carry out approved firewall and network security infrastructure changes. Perform pre- and post-maintenance checks and validation testing. Troubleshoot issues arising from security infrastructure changes. Maintain change records and operational handover documentation. Essential Skills Strong hands-on enterprise network security engineering experience. Practical experience across technologies including: Check Point, Palo Alto and Fortinet Cisco ISE and Cisco Firewall/FMC Citrix NetScaler Experience patching and upgrading security infrastructure in live production environments. Good understanding of firewalls, authentication and access control. Familiarity with ITIL change management and rollback procedures. Experience within utilities, energy or critical infrastructure environments, together with relevant security certifications, would be advantageous. Important: This is a nights-only contract, expected to follow a 4-on/4-off shift pattern. The role is fully remote within the UK and inside IR35, with payment through an umbrella company