Senior Network Engineer - Data Center & Security

HCL Technologies Limited; Singapore; On-site; SGD 120,000 - 150,000; Full time

Job summary

HCL Technologies Limited seeks an Associate Network Engineer to manage day-to-day lifecycle tasks for Cisco APIC, Nexus 9000, DNAC, ISE, and NX-OS with VXLAN and ACI. The role covers data center and enterprise environments, ensuring connectivity across sites and maintaining security devices.

You will handle F5 load balancers, collaborate on incident management, RCA, and ITSM-aligned changes while coordinating with stakeholders and inventory.

Qualifications

• Bachelor's degree in Information Technology or related field.
• 10 years of network engineering experience in data center and enterprise environments.
• Experience with ITSM processes (Incident, Change, Problem Management).
• Strong knowledge of OSI, TCP/IP, LAN/WAN concepts.
• Hands-on routing and switching: OSPF, BGP, VLAN, STP, VTP, HSRP.
• Experience with Cisco Nexus 9000 (NX-OS & ACI), VXLAN, vPC, Catalyst 9000, DNAC, ISE, Wireless (9800 WLC).
• Experience with network security solutions: Cisco FTD/ASA, Palo Alto, Check Point.
• Strong knowledge of VPNs, GRE, DMZ, and 802.1X.
• Hands-on experience with F5 Load Balancing (LTM, GTM, APM).
• Experience using packet analysis tools (Wireshark).
• Strong troubleshooting and analytical skills.

Responsibilities

• Perform Day 2 lifecycle management of Cisco APIC and Nexus 9000 (ACI mode), Cisco DNAC and Cisco ISE, Cisco Catalyst 9000 series (IOS-XE).
• Manage BAU operations, troubleshooting, and upgrades for routing and switching infrastructure across data center, DR, and remote sites.
• Ensure connectivity and network stability between remote locations and data centers.
• Administer and support network security platforms including Cisco FTD/ASA, Palo Alto, and Check Point firewalls.
• Implement, manage, and upgrade F5 Load Balancers (LTM, GTM, APM).
• Monitor network performance and ensure optimal utilization and availability.
• Perform incident management and root cause analysis (RCA).
• Execute change and release activities in alignment with ITSM processes.
• Conduct vulnerability assessment and mitigation planning for network and security infrastructure.
• Support system integration and solution deployment.
• Handle stakeholder communication, inventory, and operational responsibilities as needed.

Skills

OSI/TCP-IP fundamentals

Routing & Switching

ITSM processes

Troubleshooting & RCA

Packet analysis (Wireshark)

VPN technologies

Security concepts

Load balancing (F5)

Network performance tuning

Education

Bachelor's degree in Information Technology or related field

10+ years of network engineering experience (data center & enterprise)

Tools

Cisco Nexus 9000 NX-OS

ACI (Cisco ACI)

Cisco DNAC

Cisco ISE

Cisco FTD/ASA

Palo Alto

Check Point

F5 LTM/GTM/APM

VXLAN

Catalyst 9000

Job description

HCL Technologies Limited seeks an Associate Network Engineer to manage day-to-day lifecycle tasks for Cisco APIC, Nexus 9000, DNAC, ISE, and NX-OS with VXLAN and ACI. The role covers data center and enterprise environments, ensuring connectivity across sites and maintaining security devices.

You will handle F5 load balancers, collaborate on incident management, RCA, and ITSM-aligned changes while coordinating with stakeholders and inventory.