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

Strong 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

Prospect to work on global network security and OT cybersecurity initiatives Job no. JOB-ULBF3 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 (f/m/x) (India)
🏢 Sii Poland
📍 India