Cybersecurity Network Security Specialist

Why are you looking for a job?

If your answer ticks all the boxes, this could be the start of a great collaboration.

• You have a curious mind - You won't understand what we're talking about if you don't 🤔
• You want to learn more around technology - You won't survive if you don't 😱
• You want to make the world a bit better 😇

We happen to be just like that as well. We like hacking things here and there (you included) and create scalable solutions that bring value to the world.

SquareDev? 🐿️

We use state-of-the-art technology to build solutions for our customers and our partners' customers. We make sure we stay best-in-class by participating in research projects across Europe, collaborating with top universities and enterprises on AI, Data, and Cloud.

About QnR Group

SquareDev is a member of the QnR Group, a leading technology organization specializing in end-to-end custom software solutions, Artificial Intelligence, Cybersecurity, SAP S/4HANA, SAP Business One, ServiceNow, and FinTech solutions.

As part of QnR Group's ongoing expansion — both in Greece and internationally — we are continuously hiring across a wide range of tech roles. Successful candidates may be hired by QnR Group, or another company within the Group, depending on the role and project.

Role overview

We are looking for a Cybersecurity Network Security Specialist to join one of our public sector clients based in Warsaw. You'll be hands-on in protecting and maintaining the network security infrastructure of a large enterprise environment.

Requirements

The ideal candidate will be responsible for:

• Administering, monitoring and troubleshooting network security solutions.
• Providing 2nd line support to system and network users.
• Creating and maintaining technical documentation and operating procedures.
• Identifying and advising on network security improvements, changes and upgrades.

To excel in this role, you'll need:

• At least 5 years of experience in a similar network security role.
• Education at Level 4 or above.
• Strong understanding of TCP/IP, IP routing and network security policies.
• Good knowledge of network services (DNS, DHCP, NTP) and endpoint OS network configuration (Windows, Linux, iOS).
• Solid grasp of wired/wireless access technologies (Wi-Fi, 802.1x/EAP) and application-layer security (HTTPS/TLS, PKI, X.509).
• Hands-on experience with enterprise network hardware (Cisco routers/switches, wireless controllers, firewalls).
• Experience with stateful and stateless traffic filtering in large enterprise environments.
• Strong troubleshooting, analytical and communication skills — both technical and non-technical.
• Ability to work under pressure with minimal supervision, with a proactive and team-oriented mindset.
• Valid category B driving licence and willingness to travel within Europe occasionally (up to 10 trips/year).
• Required certification: CCNP Security or equivalent (e.g. Palo Alto Networks certifications).
• English B2 level certification or higher.
  

Nice to have:

• CCSP (Certified Cloud Security Professional) or equivalent.
• AZ-305: Designing Microsoft Azure Infrastructure Solutions or equivalent.
• Hands-on experience with Palo Alto (Panorama, GlobalProtect, forward-proxy), Cisco switching, advanced firewall troubleshooting, and VPN design at scale.
• Azure cloud networking: hub-and-spoke/landing zone design, NSGs/ASGs, Private Link, hybrid connectivity (VPN/ExpressRoute).
• SASE/SSE experience: ZTNA, TLS inspection, identity integration, and migration from legacy on-prem proxy/VPN setups.
• Zero Trust networking: identity and device posture-based policy, microsegmentation, east-west/north-south traffic control.
• WAF and load balancing experience (F5, Cloudflare, Citrix, or similar).