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# Network Security Engineer

- **Company:** Descriptionabout Cacifrom
- **Location:** London, UK (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Databases, Intrusion Detection Systems, Virtual Private Networks (VPN), Network Security, Network Diagrams, Routing, Transport Layer Security, Computer Network Operations, HybridCloud, Firewalls (Computer Science), Fortinet
- **Published:** September 21, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/network-security-engineer/47629899

## About the Role

returnSupport the stability and uptime of essential services by planning changes with a documented best approach mind set. Identify where changes can be complete with zero downtime to hosted services. Plan and implement changes with a cost effective resource strategy.Identify, understand and document change risks and mitigation tactics. Identify, understand and document impact of planned technology changes, including documentation expected output from verification.Document network estate for Operation Support and to support change planning Maintain infrastructure database Complete network diagrams to a high standard.Peer review and validation of technical deployment plans Provide constructive feedback to peers to support change control requirement and maintain high standards of detail and quality offered by CACI.Core skills, knowledge and experience required Experience working in a network security deployment/migration environment. Able to manage complex policies, user- or app-based
rules. Experience in deploying NGFW in hybrid cloud environments. Extensive experience working on Fortinet Firewalls. Able to implements IDS/IPS, user-ID, SSL inspection. Designs enterprise VPN hubs, multi-factor access, high-availability tunnels. Good knowledge of routing and switching. Strong Firewall Experience Ability to work in a fast paced and demanding environment. Good stakeholder engagement skills with a strong customer service mind set. Good time management skills to manage and action business as usual operational tasks as well as execute and deliver operational projects Well-developed problem solving skills, with the ability to assimilate data rapidly in order to present solutions effectively. Flexibility and agility to adapt to changing requirements. Holds Fortinet certifications (NSE 4 to 7)FlexibilityThe key to our success is our teamwork and collaboration. We take a hybrid approach - working remotely and coming into the office depending on the
business demand and collaboration required as part of the delivery process.Equal opportunitiesCACI is proud to be an equal employer. Embracing the diversity of our people, we are on a journey to build a truly inclusive work environment where no one is treated less favorably due to ethnic origin, age, gender, veteran status, religion or belief, sexual orientation, marital status, and disability or health condition, actively working to prevent discrimination.

## Description

opportunities to work within challenging and exciting environments with our major clients in Global Media, Banking, Government, Telecoms & UtilitiesThe roleA Senior Network Security Engineer is required to join the Network Team, responsible for the deployment and planning of our clients network infrastructure.The team is responsible for the delivery and deployment of network/security projects and requests to enhance the client's infrastructure to meet current and future business demands.Key responsibilitiesPlan, manage and deploy technology changes to support DC services Deploy LAN infrastructure to support end user services requirements Includes patching schedules for facilities to cable network equipment Diagrams for Network Operations Inventory managementCreate implementation plans for RFC's to a high level of detail. Correctly document pre and post checks for change verification purposes Understand and document back out plans, clearly identifying back out points. Identify points of no