Network Infrastructure Specialist

Salary: £? - ? per year

Requirements:

• Strong experience with Fortinet / Fortigate firewalls (essential)
• Firewall policy design, auditing and optimisation
• Network segmentation, VLANs and VRF concepts
• Experience working with OT or hybrid IT/OT environments
• Experienced with firewall management tools such as FortiManager
• Proven experience delivering audit remediation or security improvement programmes
• Ability to work across multiple sites and complex environments

Responsibilities:

• Lead the hands-on remediation and standardisation of Operational Technology firewall environments across all factory sites
• Review factory-based firewall configurations and identify risks and audit gaps
• Remove or remediate unused policies and permissive rules
• Ensure firewall rules align with least privilege principles
• Implement and enforce standard firewall rule sets across all sites
• Correct rule ordering and eliminate inconsistent or overly open configurations
• Ensure key standard policies are consistently deployed
• Define and maintain reusable policy blocks for future deployments
• Support the migration of OT networks to a standardised architecture
• Establish firewalls as the front and centre control point for all OT networks
• Transition away from legacy routing via the corporate core
• Establish and govern lifecycle processes for firewall rules
• Implement ongoing controls
• Ensure temporary rules are tracked, reviewed, and removed when no longer required
• Work with Architecture teams and specialist third parties to implement network segmentation controls within the AWS environment
• Deploy and configure detection and monitoring rules to improve visibility of network traffic and access patterns
• Support the review and tuning of controls to identify overly permissive access and security gaps
• Progressively tighten and enforce network access controls in line with agreed security standards
• Ensure datacentre environments align with OT and corporate firewall and segmentation policies

Technologies:

• AWS
• Firewall
• FortiGate
• Support
• Network
• Security
• Cloud
• Architect
• DevOps

More:

We are a leading figurehead in the UK food sector with a pedigree dating back to the early 18th century. We are seeking a Technical Specialist to join our busy Technical Services Team in a contract, hybrid role based in Southampton, with 2 to 3 days onsite and UK travel required. The position runs for 6 months and offers a rate of £550 to £700 per day outside IR35.

last updated 31 week of 2026