Network Security Engineer (M/F/X)

Leonardo S.p.A.; Brussel Hoofdstad; On-site; EUR 60,000 - 75,000; Full time

Benefits offered by this job

High-visibility cybersecurity work

Long-term career opportunities

International multidisciplinary teams

Job summary

Leonardo Belgium is seeking a Network Security Engineer to design, deploy, and maintain secure network infrastructures across LAN/WAN/WLAN and VPN, while ensuring performance, resilience, and security.

You will configure and harden enterprise network infrastructure (routers, switches, firewalls, NAC, IDS/IPS, EDR) and troubleshoot complex issues, collaborating with cybersecurity architects and international teams to deliver secure solutions.

Qualifications

• Bachelor's degree in Computer Science, Network Engineering, or a related field; appreciated but not mandatory if proven experience
• Several years of professional experience in network engineering with exposure to secure environments
• Certifications in network security are desirable but not mandatory

Responsibilities

• Design, deploy, and maintain secure LAN, WAN, WLAN, and VPN infrastructures
• Configure, harden, and maintain enterprise network and security infrastructure (routers, switches, firewalls, NAC, IDS/IPS, EDR)
• Troubleshoot complex networking and connectivity issues
• Drive integration of network security controls and transition toward hybrid and cloud environments
• Produce and maintain technical documentation and network diagrams
• Collaborate with cybersecurity architects, infrastructure engineers, and international stakeholders
• Support junior colleagues by sharing technical knowledge and best practices

Skills

Routing protocols

VLANs

Spanning Tree

VPN technologies

Network design

IPS

Security hardening

Analytical thinking

Communication

Network automation

Cloud networking

Languages

Education

Bachelor's degree in CS/Network engineering

Tools

NAC

IDS/IPS

EDR

Routers and switches

Firewall

Job description

About Leonardo Belgium

Leonardo Belgium is supporting EU Institutions, NATO, and international organizations in strengthening their cyber defence capabilities, improving resilience, and protecting critical systems against evolving cyber threats.

Within Leonardo Belgium, the EU CyberSec Regional Center serves as a center of cybersecurity expertise, delivering security services and solutions across complex and mission-critical environments.

You will join a team of cybersecurity professionals working on the deployment, operation, and continuous improvement of security solutions supporting critical infrastructures and services.

This role is ideal for network engineers who enjoy designing and securing complex infrastructures, combining hands‑on technical work with architecture, troubleshooting, and continuous improvement activities across enterprise environments.

We encourage applications from candidates who may not meet every requirement listed but who are eager to learn and grow within a cybersecurity environment.

Job Specifications

• Location: Brussels (3 days on-site 2 days home-working)


• Start date: As soon as possible, early applications are appreciated


• Type of contract: Employment (Freelance is also be possible)


• Security Clearance: Eligibility for EU-PSC required

Job description

As a Network Security Engineer, you will be responsible for designing, implementing, and maintaining secure network infrastructures while ensuring their performance, resilience, and security.

• Design, deploy, and maintain secure LAN, WAN, WLAN, and VPN infrastructures


• Configure, harden, and maintain enterprise network and security infrastructure, including routers, switches, firewalls, NAC, IDS/IPS, and EDR solutions


• Troubleshoot complex networking and connectivity issues


• Drive to the integration of network security controls and contribute to the transition towards hybrid and cloud environments


• Produce and maintain technical documentation and network diagrams


• Collaborate with cybersecurity architects, infrastructure engineers, and international stakeholders


• Support junior colleagues by sharing technical knowledge and best practices

Profile

Experience / Education / Certifications

• Bachelor's degree in Computer Science, Network Engineering, or a related field, would be appreciated, but alternative educational paths with proven experience will be considered as well


• Several years of professional experience in network engineering with exposure to secure environments


• Professional certifications in network security are highly desirable but not mandatory

Successful candidates would typically have

• Knowledge of routing protocols, VLANs, Spanning Tree, and VPN technologies (IPsec, SSL)


• Proven experience with the design and implementation of secure network infrastructure, intrusion prevention systems (IPS), and network security hardening


• An analytical mindset with strong problem‑solving abilities in high‑pressure environments


• Strong interpersonal skills, with the ability to work effectively in international teams and communicate fluently in English

Nice to have

• Experience with Network Automation (Python, Ansible)


• Knowledge of Cloud Networking (AWS, Azure, or GCP)


• Previous exposure to EU Institutions, NATO, or other highly regulated environments


• French, Dutch, and/or Italian language skills

What's in it for you?

• Work in a high‑visibility cybersecurity environment supporting EU and international organizations


• Take ownership of secure network infrastructures supporting mission‑critical environments


• Contribute to large‑scale international projects involving modern networking and cybersecurity technologies


• Collaborate with experienced architects, cybersecurity specialists, and infrastructure engineers in multidisciplinary teams


• Develop your expertise while working on complex technical challenges within a highly regulated environment


• Grow within an international cybersecurity organization offering long‑term career opportunities