Network Security Engineer (M/F/X)

Leonardo SpA; Belgique (MO); Hybrid; USD 80,000 - 110,000; Full time

Benefits offered by this job

Collaboration with international teams

Career growth opportunities

High-visibility cybersecurity projects

Job summary

Leonardo SpA is seeking a Network Security Engineer in the United States to design and secure network infrastructures for mission-critical environments. You will collaborate with international teams to implement security solutions, troubleshoot connectivity issues, and drive network security integration.

Candidates should have a background in network engineering, with knowledge of routing protocols and security practices. The role is hybrid, with 3 days on-site in Brussels and offers growth within a prestigious cybersecurity organization.

Qualifications

• Proven experience with secure network infrastructure design and implementation.
• Several years of professional experience in network engineering.
• Knowledge of VLANs, Spanning Tree, and IPS technologies.

Responsibilities

• Design, deploy, and maintain secure LAN, WAN, WLAN, and VPN infrastructures.
• Troubleshoot complex networking and connectivity issues.
• Support junior colleagues by sharing technical knowledge.

Skills

Routing protocols

Network security hardening

Analysis and problem-solving

VPN technologies

Education

Bachelor's degree in Computer Science or related field

Tools

Cisco routers and switches

Firewalls

Network Automation (Python, Ansible)

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 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 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 environmentsStrong 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