Network Security Engineer

X4 Technology; Oost-Vlaanderen; On-site; EUR 55,000 - 75,000; Full time

Job summary

X4 Technology is seeking a Network Security Engineer to manage and optimise firewall rules across Cisco and Palo Alto environments, ensuring secure and efficient network traffic.

You will conduct application risk assessments, maintain an inventory of applications, and provide network and security support across the client IT environment, including Microsoft 365 (O365), troubleshooting incidents, and contributing to security policy improvements in a large enterprise setting.

Qualifications

• Extensive hands-on experience with Cisco and Palo Alto firewalls.
• Proven track record in enterprise network security architecture.
• Willingness to work on-site in Belgium.

Responsibilities

• Manage and optimise firewall rules across Cisco and Palo Alto environments.
• Conduct application risk assessments and maintain application inventories.
• Provide network and security support across the client's IT environment, including O365.
• Troubleshoot and resolve network connectivity, firewall and security incidents.
• Support improvement of network security policies, configurations and processes.

Skills

Cisco & Palo Alto

Firewall rules

App risk assessment

O365 support

Network troubleshooting

Policy improvement

Job description

Network Security Engineer - Role & Responsibilities

• Manage and optimise firewall rules across Cisco and Palo Alto environments, ensuring secure and efficient network traffic.
• Conduct application risk assessments and maintain an inventory of applications, identifying potential security vulnerabilities and risks.
• Provide network and security support across the client's IT environment, including Clarity and Microsoft 365 (O365).
• Troubleshoot and resolve network connectivity, firewall and security-related incidents, working closely with internal IT teams.
• Support the ongoing improvement of network security policies, configurations and operational processes within a large enterprise environment.

Network Security Engineer - Required Experience

• Proven experience as a Network & Security Engineer/Architect within enterprise environments.
• Strong hands-on experience with Cisco and Palo Alto firewalls, including firewall rule management, optimisation and troubleshooting.
• Experience conducting application risk assessments and maintaining application inventories.
• Good understanding of network security, firewall policies, network troubleshooting and Microsoft 365 (O365) support.
• Ability to work full-time on-site in Belgium, with minimal remote working.

Interviews:

September 2026

Start Date:

October 2026