Network Security SME

Location: Pune, Chennai, Hyderabad, Bengaluru

Shift: Core US Shift (9:00 AM - 6:00 PM EST) with occasional night shift coverage (India daytime)

Experience: 8+ Years

Job Summary

We are seeking an experienced Network Security SME with strong expertise in Palo Alto, Fortinet, F5 Load Balancers, SD-WAN, Infoblox DDI, and Cisco Routing & Switching. The ideal candidate will be responsible for designing, implementing, securing, and supporting complex enterprise network security environments while serving as a Tier-3 escalation point for critical incidents and architectural initiatives.

Key Responsibilities

Firewall Administration & Architecture

- Install, configure, and maintain Palo Alto PA-Series and Fortinet FortiGate firewalls.
- Design, implement, and audit firewall security policies, NAT rules, security profiles, and access controls.
- Manage enterprise firewall environments using Palo Alto Panorama and FortiManager/FortiAnalyzer.
- Configure and support Site-to-Site IPsec VPNs and Remote Access VPNs (GlobalProtect and FortiClient).
- Implement advanced security features including IPS/IDS, URL Filtering, Anti-Malware, Application Control, and Threat Prevention.
- Perform firmware upgrades, vulnerability remediation, patching, and lifecycle management.
- Maintain High Availability (HA) environments including Active/Passive and Active/Active deployments.

Network Security Operations
- Monitor security events and firewall logs to identify threats, anomalies, and unauthorized activity.
- Conduct proactive security assessments and recommend network hardening measures.




- Troubleshoot security incidents and provide root cause analysis (RCA).
- Ensure network security compliance and operational excellence.

Traffic Management & Core Network Services (DDI)
- Configure and manage F5 BIG-IP LTM including VIPs, Pools, Monitors, SSL Offloading, and iRules.
- Administer Infoblox Grid Manager for DNS, DHCP, and IP Address Management (IPAM).
- Maintain high-availability DDI infrastructure and optimize network service delivery.
- Support automation initiatives for IP allocation, DNS management, and operational efficiency.

SD-WAN & Edge Network Architecture
- Design, deploy, and optimize Fortinet Secure SD-WAN or Palo Alto Prisma SD-WAN environments.
- Implement application-aware routing and traffic steering for business-critical applications.
- Support hybrid connectivity solutions across on-premises, cloud, and branch locations.
- Manage secure VPN overlays and WAN optimization initiatives.

Cisco Routing & Switching
- Robust hands-on experience with Cisco Routing & Switching technologies.
- Troubleshoot Layer 2 and Layer 3 connectivity issues across enterprise networks.
- Configure and support VLANs, STP, OSPF, BGP, EIGRP, HSRP, VRRP, and routing policies.




- Work closely with security and infrastructure teams to ensure network availability and performance.

Troubleshooting & Support
- Act as a Tier 2/Tier 3 escalation engineer for complex network and security incidents.
- Perform detailed packet analysis using Wireshark, tcpdump, and firewall packet captures.
- Troubleshoot multi-vendor environments involving F5, Firewalls, SD-WAN, DNS/DHCP, and Cisco networks.
- Monitor firewall performance metrics including CPU, memory, session utilization, and throughput.
- Drive performance tuning and continuous service improvements.

Mandatory Skills

- Palo Alto Firewalls (PA-Series)
- Palo Alto Panorama
- Fortinet FortiGate
- FortiManager / FortiAnalyzer
- Site-to-Site VPN & Remote Access VPN
- F5 BIG-IP LTM
- Infoblox DNS, DHCP & IPAM
- SD-WAN (Fortinet Secure SD-WAN or Prisma SD-WAN)
- Cisco Routing & Switching
- Wireshark / tcpdump Packet Analysis
- Network Security Operations & Incident Management
- High Availability (HA) Firewall Deployments

Preferred Skills

- Cloud Networking (AWS/Azure)
- Network Automation
- Infrastructure Architecture
- Security Compliance & Governance
- Scripting using Python or Ansible

Ideal Candidate Profile

- 8+ years of enterprise network and network security experience.
- Strong architectural and troubleshooting expertise across security, routing, switching, load balancing, and SD-WAN.
- Proven experience managing large-scale multi-vendor environments.
- Excellent stakeholder communication and incident management skills.
- Comfortable working in US business hours and supporting critical production environments.

📌 Network Security SME (Maharashtra)
🏢 Zensar Technologies
📍 Maharashtra