IT Executive – Network & Infrastructure Support

Lumina Advisory & Global Search; Singapore; On-site; SGD 42,000 - 66,000; Full time

Job summary

Lumina Advisory & Global Search is seeking a Network Administrator/IT Support professional in Singapore. The role covers managing corporate network infrastructure, including LAN, WAN, Wi‑Fi, VLANs, DHCP, DNS, and IP addressing, plus maintaining firewalls and security policies.

You will support Windows and macOS endpoints and coordinate with service providers. The candidate should have 1–3 years of IT support experience, good communication, and a foundational IT certification such as CCNA or

Qualifications

• Higher Nitec, Diploma, or Degree in Information Technology, Computer Studies, Information Systems, or a related discipline.
• Minimum 1 to 3 years of IT support, helpdesk, desktop support, or field support experience.
• Effective communication and collaboration skills, with the ability to work with end users, internal teams, and external service providers.

Responsibilities

• Administer, maintain, and troubleshoot corporate network infrastructure (LAN, WAN, Wi‑Fi, VLANs, DHCP, DNS, IP addressing).
• Configure, maintain, and troubleshoot firewalls, network access policies, routing, NAT, and connectivity.
• Maintain network diagrams, IP address plans, VLAN documentation, and device inventories.
• Implement network segmentation and access controls for corporate and guest networks.
• Coordinate with ISPs and external providers on incidents, maintenance, and improvements.
• Install, configure, update, and troubleshoot Windows and macOS computers.
• Provide day‑to‑day IT support for OS, apps, connectivity, and peripherals.
• Maintain endpoint inventories and incident resolution records.

Education

IT Diploma / Degree

LAN/WAN concepts

TCP/IP & Networking

Security basics & VPNs

Tools

CCNA

CompTIA Network+

Job description

Responsibilities

Administer, maintain, and troubleshoot corporate network infrastructure, including LAN, WAN, Wi-Fi, switches, routers, VLANs, DHCP, DNS, and IP addressing.

• Configure, maintain, and troubleshoot firewalls, network access policies, routing, NAT, and network connectivity.
• Maintain network configuration backups, network diagrams, IP address plans, VLAN documentation, and network device inventories.
• Implement network segmentation and access controls for corporate and guest networks.
• Coordinate with ISPs and external service providers on network incidents, maintenance, and infrastructure improvements.
• Regularly review network configurations and recommend and implement improvements to enhance network stability, performance, and security.
• Install, configure, update, maintain, and troubleshoot Windows and macOS computers.
• Provide day-to-day IT support to employees, resolving issues related to operating systems, applications, network connectivity, and peripheral devices.
• Maintain endpoint device inventories, operating procedures, and incident resolution records.

Requirements – Qualifications & Experience

• Higher Nitec, Diploma, orDegree in Information Technology, Computer Studies, Information Systems, or a related discipline.
• Minimum 1 to 3 years of IT support, helpdesk, desktop support, or field support experience.
• Effective communication and collaboration skills, with the ability to work with end users, internal teams, and external service providers.

Technical Requirements – Skills & Competencies

• Strong understanding of TCP/IP and corporate network architecture, with practical experience in LAN, WAN, Wi-Fi, VLANs, DHCP, DNS, and IP address planning.
• Hands-on experience configuring, maintaining, and troubleshooting switches, routers, and firewalls.
• Familiarity with firewall policies, network access controls, routing, and NAT configuration.
• Proficiency in Windows and macOS, including endpoint deployment, configuration, maintenance, and troubleshooting.
• Strong analytical and problem-solving skills, with the ability to independently investigate issues, track progress, and maintain documentation.
• Familiarity with VPNs, network monitoring tools, and endpoint security management.
• CCNA, CompTIA Network+, or other relevant networking or systems administration certifications.