Junior Network Security Engineer

About the role

KCS IT is seeking a motivated Junior Network Security Engineer to join our hybrid team in Lisbon. You will work on a variety of client projects, helping to secure and optimise their network infrastructures while developing your expertise in modern security technologies.

Key responsibilities

• Configure, manage and maintain firewalls, including rule sets, NAT and ACLs.
• Implement and support VPN solutions for remote access and site‑to‑site connectivity.
• Troubleshoot network issues across TCP/IP, DNS, DHCP and routing layers.
• Perform security hardening and apply best‑practice security controls.
• Analyse network traffic to identify and resolve complex connectivity problems.
• Document configurations, changes and incident resolutions.

Required profile

• Approximately 3 years of professional experience in network security or network engineering.
• Fluent Portuguese and English (minimum B2 level).
• Strong problem‑solving abilities and good documentation skills.

Required skills

• Firewalls
• Firewall administration
• Firewall configuration
• NAT
• ACLs
• VPN technologies
• TCP/IP
• DNS
• DHCP
• Routing
• Security hardening
• Proxy technologies
• Load balancing
• Network traffic analysis
• Enterprise IT environments

What we offer

• Personalised career development aligned with your goals.
• Access to free training and certification programmes.
• Opportunities to work on international projects, especially in the Benelux region.
• Flexible work models: hybrid, fully remote or onsite depending on the project.
• Well‑being benefits including nutrition, psychology, medical appointments, yoga and personal training sessions.