Engineer - Enterprise Network Security

Quadrasystems.net; Coimbatore District; On-site; INR 800,000 - 1,600,000; Full time

Job summary

Quadrasystems.net in India seeks an Enterprise Network Security Engineer to support 24/7 Managed Services operations. The role covers continuous monitoring, management, and protection of enterprise security infrastructure across multiple customer environments, ensuring high availability, security posture, and strict SLA adherence.

You will handle incidents, changes, and proactive security operations, implement firewall rules, manage NGFWs, VPNs, SIEM integration, and collaborate with OEM TAC

Qualifications

• Experience in enterprise network security operations and 24/7 support.
• Strong hands-on with NGFWs, VPNs, and security policy management.
• Knowledge of SIEM integration, incident handling, and vulnerability remediation.

Responsibilities

• Provide 24/7 monitoring and support for enterprise network security infrastructure.
• Manage and troubleshoot Next-Generation Firewalls (NGFW).
• Handle L2/L3 incidents related to firewall policy, VPNs, and IPS/IDS alerts.
• Perform real-time alert analysis, triage, and escalation as per SOP.
• Implement and review firewall rules, NAT, security policies, and routing changes.
• Monitor HA and failover configurations and coordinate with teams.
• Investigate and respond to security incidents such as intrusions and DDoS.
• Maintain logs, SIEM integration, and ITSM ticket updates.
• Prepare shift handover notes and operational reports.

Skills

Enterprise Firewalls

Firewall policy

IPS/IDS

Web Filtering

Application Control

Routing & Switching

VPN technologies

Zero Trust

Secure SD-WAN

Cloud security

SIEM analysis

Packet analysis

DNS security

DDoS protection

WAF & Proxies

ServiceNow/Jira

NMS/SNMP/NetFlow

Education

Bachelor's in IT/CS or equivalent

Tools

Wireshark

TCPdump

SIEM tools

ServiceNow

Jira

NMS

Job description

Job Summary

We are looking for an Enterprise Network Security Engineer to support 24/7 Managed Services operations. The role focuses on continuous monitoring, management, and protection of enterprise network security infrastructure, ensuring high availability, strong security posture, and strict SLA adherence. The engineer will handle incidents, changes, and proactive security operations across multiple customer environments.

Key Responsibilities

• Provide 24/7 monitoring and support for enterprise network security infrastructure
• Manage and troubleshoot Next-Generation Firewalls (NGFW)
• Handle L2/L3 incidents related to:
  • Firewall policy issues
  • VPN (IPSec, SSL, Site-to-Site, Remote Access)
  • IPS/IDS alerts
  • Network segmentation and access issues
• Perform real-time alert analysis, triage, and escalation as per SOP
• Implement and review firewall rules, NAT, security policies, and routing changes
• Monitor and maintain High Availability (HA) and failover configurations
• Investigate and respond to security incidents such as:
  • Intrusion attempts
  • DDoS attacks
  • Suspicious traffic patterns
  • Policy violations
• Perform network security health checks and posture assessments
• Ensure logs are forwarded and integrated with SIEM systems
• Participate in vulnerability remediation and security hardening activities
• Maintain accurate ticket updates and documentation in ITSM tools
• Prepare shift handover notes and operational reports
• Coordinate with OEM TAC teams and internal engineering teams
• Support onboarding of new enterprise customers into managed services
• Ensure compliance with SLAs, KPIs, and customer security requirements

Technical Skills Required

1. Strong experience with:
   • Enterprise Firewalls
   • Firewall policy management and optimization
   • IPS/IDS, Web Filtering, Application Control
2. Solid understanding of:
   • Routing and Switching (BGP, OSPF, VLANs, Subnets)
   • VPN technologies (IPSec, SSL VPN)
   • Network segmentation and Zero Trust concepts
3. Experience with:
   • Secure SD-WAN
   • Cloud network security (Azure/AWS - basic to intermediate)
   • SIEM log analysis and integration
   • Packet analysis tools (Wireshark, TCPdump)
4. Knowledge of:
   • DNS security, DDoS protection
   • WAF and proxy concepts
   • Compliance standards (ISO 27001, PCI-DSS, SOC2)
5. Familiarity with:
   • Ticketing tools (ServiceNow, Freshservice, Jira, etc.)
   • Network monitoring systems (NMS, SNMP, NetFlow)

Behavioral & Operational Skills

• Willingness to work in 24/7 rotational shifts
• Strong troubleshooting and root-cause analysis skills
• Ability to work under pressure in incident situations
• Clear communication and strong documentation discipline
• Ownership-driven and customer-focused approach
• Strong collaboration with shift teams and escalation teams
• Strict adherence to SOPs and security processes

Certifications (Preferred)

• CCNA Security / CCNP Security
• CEH, Security+
• ITIL Foundation

KPIs for the Role

• SLA and response-time compliance
• Incident resolution quality and closure rate
• Change success rate (zero-impact changes)
• Security incident containment effectiveness
• Shift handover accuracy
• Customer satisfaction score
• Proactive risk identification and prevention