Network Security L3

HCLTech; Singapore; On-site; SGD 110,000 - 170,000; Full time

Job description

• 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.
• 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.
• 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.
• Continuous improvement and automation-first mindset.
• Strong collaboration and cross-functional coordination skills.
• Strategic thinking with focus on operational excellence, stability, and business outcomes.