Network Security Engineer

What you will do

Join Johnson Controls’ global Network Security Operations team and play a key role in protecting a large, complex enterprise network. You’ll be the go‑to expert for Zero Trust network access, with a strong focus on Forescout NAC, while also owning parts of our Infoblox DDI environment.

This is a hands‑on operational role where your work directly improves network visibility, security posture, and user experience across the business.

How you will do it

Primary focus: Forescout NAC, Device Classification and Segmentation

• Own day‑to‑day operations of the Forescout NAC platform globally

• Monitor platform health, troubleshoot issues, and ensure high availability.

• Resolve network access incidents (802.1X, RADIUS, MAB, Guest access).

• Identify, classify, and manage the lifecycle of 30,000+ unmanaged, IoT, and OT devices.

• Enforce Zero Trust policies, including:

  • MAC address whitelisting and exceptions

  • “Semi‑Trust” access rules

  • Network segmentation (VLANs, ACLs)

Secondary focus: Infoblox DDI and Automation

• Act as platform owner for Infoblox Universal DDI (BloxOne).

• Manage virtual appliances across Azure, AWS, and on‑prem environments.

• Implement proactive monitoring and platform resilience.

• Execute DNS changes and enable security features such as RPZ and DNS Traffic Control.

• Work closely with the Global Network team within a clear RACI model (DNS operations only; DHCP/IPAM consumption).

What we look for

Required

• Hands‑on operational experience with Forescout NAC.

• Solid understanding of 802.1X, RADIUS, MAB, and core networking concepts (TCP/IP, VLANs, routing, switching).

• Experience working in ITIL‑based operations (Incident, Change, Problem).

• Strong troubleshooting mindset and ability to create clear operational documentation for L1/L2 teams.

Preferred

• Forescout certifications (FSCA / FSCP).

• Experience with Infoblox Universal DDI (BloxOne).

• Enterprise DNS and DNS security experience (RPZ, DTC).

• Exposure to Zero Trust architecture and IoT/OT environments.

• Automation experience (ServiceNow CMDB, PowerApps, Python, APIs).

Our benefits

Besides working in an international environment, you will receive a regularly monthly bonus after your first six months, meal vouchers, a recreation allowance and retail discounts. Additionally, our flexible benefits program will allow you to customize benefits from a selection of 3500 products and service such as gym membership, medical cover, a multi-sports card plus many more.

Our onsite facilities at our Bratislava based office includes a canteen, nursery and coffee machines.

If you are relocating to Bratislava to join Johnson Controls, you will be eligible to receive a housing allowance to help you setup your new life in Slovakia.

The gross monthly salary for this position starts from 2,250 EUR per month, plus a monthly bonus that starts after your first 6 months. Please note this is a minimum salary and our compensation packages are based on your professional experience and qualifications.

Our culture

Johnson Controls, a global leader in thermal management, mission-critical building systems, energy efficiency, and decarbonization, helps customers use energy more productively, reduce carbon emissions, and operate with the precision and resilience required in rapidly expanding industries such as data centers, healthcare, pharmaceuticals, advanced manufacturing, and higher education.

For more than 140 years, Johnson Controls has delivered performance where it really matters. Backed by advanced technology, lifecycle services and an industry-leading field organization, we elevate customer performance, turn goals into real-world results and help move society forward.

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