IT Network Security Specialist

Zagreb, Croatia (Hybrid)

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.

Location: Zagreb

What you’ll be doing: 

  • 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

We are looking for: 

  • 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

Would be considered a plus: 

  • 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

We offer: 

You won’t just work on cutting-edge technology—you’ll be part of a team that values your ideas, supports your growth, and makes sure you enjoy the journey along the way. Here’s what you can look forward to: 

  • Smooth start – a company laptop, and a mobile phone with great plan.
  • Flexibility – hybrid work and flexible hours that fit your lifestyle.
  • Career growth – level up with mentoring, scholarships, and continuous learning.
  • Performance rewards – annual awards, performance-based bonuses, innovation incentives, and a holiday allowance.
  • Commute covered – full reimbursement for public transportation.
  • Beyond basic health – regular medical check-ups, supplementary & additional health insurance, and well-being programs.
  • Family support – 2000 EUR newborn gift, kindergarten subsidy, and extra days off for family needs.
  • Referral reward – earn a bonus for bringing great talent.
  • Meal perks – 100 EUR monthly meal allowance and access to our on-site restaurant in Zagreb.  
  • Life beyond work – join sports, cultural, and community activities.
  • Active lifestyle – stay active with a partially subsidized Multisport card.
  • Time to recharge – enjoy compensatory time off during the Christmas holidays.
  • And much more.

Please submit your application, including your CV, written in either Croatian or English. Any personal projects (on GitHub or similar) are also welcome. 

Croatian citizenship or a work permit for Croatia is mandatory.  

Candidates will be evaluated and contacted after passing the initial screening. 

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