Network Security Engineer at Johnson… · Bratislava

Network Security Engineer Location: Bratislava-Bratislava-Slovakia What you will do As part of Johnson Controls’ global Network Security Operations function, this role is responsible for the day-to-day operation, monitoring, support, and lifecycle management of the enterprise network security infrastructure on Level 1 and 2. The environment supports 1,000+ sites and 100,000+ users, including datacenters, manufacturing plants, sales offices, and customer contact centers. Technologies include Cisco, Fortinet, Zscaler, Silver Peak SD WAN, Akamai Guardicore, Tufin, Forescout NAC, Microsoft Azure, Google GCP, and related security platforms. How you will do it Operational Support & Maintenance Operate and support enterprise Zero Trust platforms, primarily Forescout NAC and Infoblox DDI. Perform daily monitoring, health checks, and troubleshooting of network access control services, DNS, and DHCP. Manage network access exceptions, MAC address repository (MAR) whitelisting, and device compliance checks for corporate and BYOD/Guest networks. Data Analytics & Asset Management Leverage data analytics skills to analyze, correlate, and reconcile asset data across Forescout, Infoblox, Axonius, and ServiceNow CMDB. Assist in identifying, classifying, and managing the lifecycle of over 30,000 unmanaged, IoT, and OT devices across the global network. Incident & Problem Management Respond to network access control incidents, including 802.1X/RADIUS authentication failures and Guest Captive Portal (JCI-Internet) loading issues. Work collaboratively with the Network TOC, Service Desk, and field IT teams during security events or network service degradations. Change & Configuration Management Implement approved access control rules, semi-trust policies, and network segmentation changes (VLAN assignments/ACLs) in production environments. Execute DNS/DHCP configuration changes and IPAM updates following formal change management processes. Automation & Continuous Improvement Identify opportunities to automate repetitive operational tasks (e.g., utilizing PowerApps/Power Automate to streamline MAC address approvals). Assist with operational runbooks, standard operating procedures, and knowledge documentation for L1/L2 support teams. What we look for Required Hands-on operational experience supporting enterprise network security, network access control, or DDI environments. Willingness to learn. Preferred Working knowledge of network authentication protocols (802.1X, RADIUS, MAB) and core networking concepts (TCP/IP, VLANs, routing/switching). Experience troubleshooting DNS, DHCP, and IP address management (IPAM) issues. Experience working within ITIL-based operational processes (incident, change, problem). Direct experience operating Forescout, Infoblox, or Axonius platforms. Experience with ServiceNow CMDB and building automated workflows (e.g., PowerApps). Exposure to Zero Trust Network Architecture and IoT/OT device classification from an operational perspective. Basic scripting or automation experience (Python preferred). Security or networking certifications (e.g., Forescout FSCA/FSCP, CCNA, Security+). 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 At Johnson Controls you’ll have the opportunity to work on some of the most exciting projects in today’s market. Our hardworking people empower us, and we believe in being part of a team that is open, collaborative, results-oriented, hardworking and above all fun. We believe that diversity and inclusion matter and make a difference. By embracing the true value of diversity and inclusion, getting comfortable with having crucial conversations, and valuing different perspectives, we will be one of the most desirable places to work. #LI-BB1 #LI-Hybrid