We are looking for a Senior Network Security Engineer to support network security and infrastructure initiatives across LAN, Wi-Fi, data center, and firewall environments. You will work with Fortinet, Cisco, and Aruba technologies, supporting firewall policy administration, IPsec VPNs, network re-IP activities, OT monitoring deployments, and cybersecurity initiatives in a global enterprise environment. Your tasks
• Administering Fortinet firewall policies and IPsec VPN configurations, including routing and encryption domains
• Reviewing LAN infrastructure and configuring SPAN ports to support OT monitoring device deployments
• Planning and executing network re-IP activities across hardware, LAN, Wi-Fi, and data center environments
• Monitoring firewall and network logs, identifying potential issues, and supporting security hardening activities
• Troubleshooting Cisco, Aruba, Fortinet, and Meraki network infrastructure to maintain reliable connectivity
• Supporting firewall audits, identifying required rules and configurations, and implementing cybersecurity improvements
• Collaborating with cybersecurity, infrastructure, and other technical teams to deliver network and security initiatives
• Supporting additional network projects and operational activities, including troubleshooting, configuration changes, and infrastructure enhancements Requirements
• Minimum 6 years of experience in network engineering, network security, or infrastructure roles
• Robust hands-on experience with Fortinet/FortiGate, firewall policy administration, and IPsec VPN technologies
• Good knowledge of Cisco and Aruba networking technologies, including LAN, Wi-Fi, VLANs,



and SPAN configuration
• Experience with network re-IP planning, addressing, hardware reconfiguration, and related migration activities
• Strong understanding of general networking across data center, LAN, and Wi-Fi environments
• Experience with firewall audits, security initiatives, log analysis, routing, encryption domains, and network hardening
• Familiarity with Cisco Meraki, OT environments, and network monitoring solutions is an advantage
• Strong analytical and troubleshooting skills with the ability to work independently and collaboratively
• Very good command of the English language (minimum B2 level) Nice to have
• Experience supporting OT monitoring and industrial network environments
• Knowledge of Cisco Meraki and Aruba/Fortinet wireless solutions
• Experience participating in cybersecurity and firewall audit initiatives
• Exposure to large-scale network transformation, re-IP, and infrastructure projects
• Opportunity to work on global network security and OT cybersecurity initiatives Job no. JOB-VX6UG Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws. Benefits For You
• Diverse portfolio of clients
• Wide portfolio of technologies
• Employment stability
• Remote work opportunities
• Contracts with the biggest brands
• Great Place to Work Europe
• Many experts you can learn from
• Open and accessible management team

📌 Senior Network Security Engineer (India)
🏢 Sii Poland
📍 India