Network Security Engineer (Level 3)

Location: Steenokkerzeel / Melsbroek
Timing: Start planned: June/July 2026 – December 2027 (fulltime)
Man-days: 330 (indicative quantity)
Partially remote in consultation with the client

For a long-term and technically challenging assignment, we are looking for a senior Network Security Engineer with in-depth experience in firewalling and network security. You will be responsible for designing, implementing, and maintaining a robust security infrastructure that protects critical networks against cyber threats, unauthorized access, and data breaches.

Your responsibilities

Network & Security Engineering

• Implementing firewall solutions, VPN configurations, and intrusion detection/prevention systems.
• Integrating security solutions within the broader network design.

Firewall Management

• Configuring, managing, and optimizing firewall environments.
• Regularly updating policies based on new risks and changing needs.

Intrusion Detection & Prevention

• Implementing and managing IDS/IPS technology.
• Analyzing security logs and following up on potential incidents.

VPN Implementation

• Deploying and managing secure VPN connections for employees, partners, and locations.
• Ensuring confidentiality and integrity of all data flows.

Security Auditing & Compliance

• Conducting audits and vulnerability assessments.
• Ensuring compliance with GDPR, PCI DSS, and other relevant standards.
• Contributing to the development and improvement of security policies.

Incident Response

• Investigating security incidents and coordinating remedial actions.
• Implementing improvements based on incident analyses.

Monitoring & Optimization

• Continuously monitoring network traffic and analyzing anomalies.
• Optimizing network performance without compromising security.

Collaboration & Communication

• Collaborating with system engineers, application teams, and other stakeholders.
• Clearly communicating complex security topics to both technical and non-technical colleagues.

What do you bring?

Experience

• At least 10 years of experience as a Network Engineer within a security context.
• Proven experience with the design, configuration, and management of firewall environments.
• Extensive experience with IDS/IPS, VPNs, auditing, compliance, and incident response.
• Additional asset: experience with Fortinet and IVANTI Pulse Secure.

Technical knowledge

• Strong knowledge of network protocols, architectures, and monitoring tools (SNMP, NetFlow, …).
• In-depth understanding of encryption, security frameworks, and best practices.
• Good knowledge of regulations such as GDPR and PCI DSS.

Skills

• Analytical, structured, and strong in problem-solving.
• Communicative and able to explain complex technical topics clearly.

Education & Certifications (plus, not required)

• Bachelor in IT, Computer Science, or equivalent through experience.
• Certifications such as CISSP or CCNP Security are a valuable asset.