IT Network Security Specialist

At Ericsson Nikola Tesla, we don’t just follow technology—we shape it. With nearly 3000 professionals, mostly from STEM fields, we’re a powerhouse of innovation built on over 75 years of experience. As the region’s leading R&D center and a leading exporter of software development services, we blend deep expertise with bold ideas—lighting the way toward a more connected, secure, and intelligent future. Beyond our cutting-edge ICT solutions in the telecom sector, we’re also shaping the future in healthcare, transport, public services, and multimedia. Our innovative technologies make a real difference—enhancing everyday life and delivering meaningful value to communities.

Our Enterprise IT unit is currently seeking a Network Security Specialist, who will be responsible for protecting and continuously improving the security of enterprise network infrastructure. This role requires a hands-on, analytical mindset and the ability to independently investigate complex network security issues. You will work close to day-to-day operations, not only maintaining controls, but actively analyzing traffic, identifying weaknesses and driving concrete improvements.

• →Design, implement and operate network security controls across enterprise environments
• →Perform analysis of network security events, anomalies and incidents
• →Investigate suspicious network behavior and traffic patterns across multiple data sources
• →Monitor and analyze logs from firewalls, IDS/IPS, network monitoring and related systems
• →Identify root causes of security issues and propose corrective and preventive actions
• →Continuously assess effectiveness of existing network security controls
• →Develop, update and maintain technical documentation and operating procedures
• →Proactively identify gaps, weaknesses and opportunities for improvement in network security
• →Provide expert input for security design decisions and new initiatives

• 5+ years of experience in network security or closely related roles
• University degree in ICT or a related field
• Has strong hands-on experience in network security operations
• Communicates findings clearly to both technical and non‑technical audiences
• Strong understanding of:
  • Enterprise networking (routing, switching, segmentation, VPNs)
  • Firewall architectures and security policy design
  • Network security protocols and traffic analysis
• Hands-on experience with:
  • Firewalls and perimeter security
  • IDS/IPS and anomaly detection systems
  • Network monitoring and logging tools
• Solid understanding of Linux/UNIX and Windows environments
• Ability to continuously evaluate security posture and drive improvements

• Experience in incident response or SOC environments
• Knowledge of security frameworks and standards (ISO 27001, NIST, OWASP)
• Experience with large enterprise or hybrid environments
• Familiarity with advanced network security concepts (zero trust, microsegmentation)
• Vendor‑specific experience (e.g. Palo Alto, Cisco, F5, VMware NSX or similar)
• Certifications (preferred, not mandatory):
  • CCNP Security or equivalent
  • PCNSE
  • VMware NSX
  • Other relevant network or security certifications