Network Security Engineer - L3

HCL Singapore Pte Ltd; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

HCL Singapore Pte Ltd is seeking an experienced Senior Network Engineer to act as the Level 3 escalation point for critical P1/P2 incidents and lead advanced troubleshooting across LAN, WAN, WLAN, Data Center, Cloud, and Security environments.

You will drive RCA and Problem Management, implement permanent corrective actions, support Cisco ACI fabric operations, manage routing, VPNs, SD-WAN, and load balancers, and mentor Tier 1/2 engineers while coordinating with OEMs and service providers to

Qualifications

• 8-12 years of experience in Network and Network Security Operations.
• Experience supporting enterprise environments across Data Center, Campus, WAN, Cloud, and Security domains.
• Hands-on experience in troubleshooting and supporting firewalls, routing, switching, VPNs, load balancers, DDI platforms, and cloud networking.

Responsibilities

• Act as the Level 3 escalation point for critical P1/P2 incidents and complex network issues.
• Lead advanced troubleshooting across LAN, WAN, WLAN, Data Center, Cloud, Security, DDI, and Load Balancer environments.
• Drive Root Cause Analysis (RCA), Problem Management, and implementation of permanent corrective actions.
• Support Cisco ACI fabric operations, including VRF management, EPG health checks, leaf commissioning/decommissioning, and fabric troubleshooting.
• Manage routing and switching technologies including BGP, OSPF, VLANs, VRFs, QoS, and network segmentation.
• Provide expert support for WAN, Internet, MPLS, SD-WAN, VPN, and hybrid connectivity solutions.
• Lead implementation of approved network and security changes, migrations, upgrades, and technology refresh activities.
• Support firewall, proxy, VPN, NAC, and secure access platforms, including policy management and security incident resolution.
• Manage F5 load balancer platforms including VIPs, Pools, SSL certificates, HA validation, and platform upgrades.
• Support AWS networking services including VPCs, Transit Gateway, Route Tables, Direct Connect, VPN, Security Groups, and NACLs.
• Perform capacity planning, availability reviews, performance analysis, and resiliency assessments.Coordinate with OEMs, TAC teams, ISPs, and service providers for complex issue resolution and restoration activities.
• Drive compliance reviews, configuration baseline validation, drift management, audit support, and remediation activities.
• Identify automation opportunities and support automation, observability, and self-healing initiatives.
• Develop and maintain technical documentation, standards, knowledge articles, and operational procedures.
• Mentor Tier 1 and Tier 2 engineers and provide technical leadership and governance support.

Skills

Enterprise Networking

Network Security

Application Delivery & Load Balancing

DDI Services

Cloud Networking

Automation & Observability

ITSM & Governance

Job description

Responsibilities

• Act as the Level 3 escalation point for critical P1/P2 incidents and complex network issues.
• Lead advanced troubleshooting across LAN, WAN, WLAN, Data Center, Cloud, Security, DDI, and Load Balancer environments.
• Drive Root Cause Analysis (RCA), Problem Management, and implementation of permanent corrective actions.
• Support Cisco ACI fabric operations, including VRF management, EPG health checks, leaf commissioning/decommissioning, and fabric troubleshooting.
• Manage routing and switching technologies including BGP, OSPF, VLANs, VRFs, QoS, and network segmentation.
• Provide expert support for WAN, Internet, MPLS, SD-WAN, VPN, and hybrid connectivity solutions.
• Lead implementation of approved network and security changes, migrations, upgrades, and technology refresh activities.
• Support firewall, proxy, VPN, NAC, and secure access platforms, including policy management and security incident resolution.
• Manage F5 load balancer platforms including VIPs, Pools, SSL certificates, HA validation, and platform upgrades.
• Support AWS networking services including VPCs, Transit Gateway, Route Tables, Direct Connect, VPN, Security Groups, and NACLs.
• Perform capacity planning, availability reviews, performance analysis, and resiliency assessments.Coordinate with OEMs, TAC teams, ISPs, and service providers for complex issue resolution and restoration activities.
• Drive compliance reviews, configuration baseline validation, drift management, audit support, and remediation activities.
• Identify automation opportunities and support automation, observability, and self-healing initiatives.
• Develop and maintain technical documentation, standards, knowledge articles, and operational procedures.
• Mentor Tier 1 and Tier 2 engineers and provide technical leadership and governance support.

Qualifications

• 8-12 years of experience in Network and Network Security Operations.
• Experience supporting enterprise environments across Data Center, Campus, WAN, Cloud, and Security domains.
• Hands-on experience in troubleshooting and supporting firewalls, routing, switching, VPNs, load balancers, DDI platforms, and cloud networking.

Required Skills

• Enterprise Networking: Cisco ACI, Cisco Nexus, Cisco Catalyst, Cisco DNAC, Routing & Switching, BGP, OSPF, VLANs, VRFs, QoS, LAN, WAN, WLAN, MPLS, SD-WAN.
• Network Security: Palo Alto Firewalls, Check Point Firewalls, Cisco FTD/ASA, Fortinet Firewalls, Azure Firewall, Cisco ISE, VPN Technologies, Zscaler (ZIA/ZPA), Bluecoat Proxy, Secure Web Gateway Technologies.
• Application Delivery & Load Balancing: F5 BIG-IP LTM, GTM, APM, SSL Certificate Management, High Availability and Failover Technologies.
• DDI Services: Infoblox, BloxOne, DNS, DHCP, IPAM.
• Cloud Networking: AWS Networking, VPC, Transit Gateway, Route Tables, Direct Connect, VPN Connectivity, Security Groups, NACLs.Automation & Observability: Ansible Automation Platform, BMC Helix, Datadog, Grafana, Network Automation, Self-Healing Workflows.
• ITSM & Governance: ITIL Service Management, Incident Management, Problem Management, Change Management, Release Management, Compliance, Audit and Governance Management.

Preferred Skills

• Strong analytical and problem-solving skills.
• Excellent troubleshooting and decision-making capabilities.
• Strong stakeholder and customer management skills.
• Effective communication and presentation skills.
• Ability to lead technical discussions and major incident bridges.
• Strong leadership and mentoring capabilities.
• Vendor and OEM management experience.
• Ability to work effectively in high-pressure production environments.
• Strong documentation and reporting discipline.
• Continuous improvement and automation-first mindset.
• Strong collaboration and cross-functional coordination skills.
• Strategic thinking with focus on operational excellence, stability, and business outcomes.