Network Infrastructure Engineer

ALPHAEUS PTE. LTD.; Singapore; On-site; SGD 60,000 - 90,000; Full time

Job summary

ALPHAEUS PTE. LTD. is seeking an experienced Network Engineer to support daily operation, maintenance and improvement of enterprise network and voice infrastructure in Singapore.

You will ensure reliable connectivity and timely resolution of service incidents, while collaborating with internal teams and vendors. The role requires hands-on Cisco switches/routers and wireless infrastructure experience, knowledge of LAN/WAN and routing protocols, plus familiarity with CUCM/UC and IP telephony.

Qualifications

• Diploma or Degree in IT/CS/Engineering/Telecommunications or related field.
• 5–6 years of enterprise network engineering or infrastructure support experience.
• Hands-on experience with Cisco switches/routers and wireless infrastructure.
• Knowledge of LAN/WAN, wireless networking and routing protocols (BGP/EIGRP/OSPF).
• Experience with network monitoring, incident resolution and change implementation.
• Familiarity with Cisco voice systems (CUCM/UC) and IP telephony is preferred.

Responsibilities

• Operate and support LAN, WAN, wireless networks, data centre connectivity and enterprise voice systems.
• Install, configure, maintain and troubleshoot Cisco switches, routers, wireless APs and related gear.
• Monitor network availability, performance and alerts; investigate incidents and take corrective actions.
• Provide Level 1/2 support; escalate to vendors or specialists when needed.
• Support routing and switching technologies (BGP, EIGRP, OSPF, VLANs, MPLS).
• Coordinate network projects with IT teams, providers, vendors and cabling contractors.
• Conduct wireless site surveys, cabling tests, and assess coverage.
• Support CUCM, CUC, IP phones, Cisco Jabber, Webex and voice gateways.

Skills

Network engineering

Troubleshooting

Documentation

Communication

Teamwork

Education

Diploma or Degree in IT/CS/Engineering/Telecommunications

Tools

Cisco switches

Cisco routers

Wireless access points

CUCM/UC

Voice gateways

Webex

Job description

Job Summary

Support the daily operation, maintenance and improvement of enterprise network and voice infrastructure, ensuring reliable connectivity and timely resolution of service incidents.

Key Responsibilities

• Operate and support LAN, WAN, wireless networks, data centre connectivity and enterprise voice systems.
• Install, configure, maintain and troubleshoot Cisco switches, routers, wireless access points and associated network equipment.
• Monitor network availability, performance and alerts, investigate incidents and implement corrective actions.
• Provide Level 1 and Level 2 support, including troubleshooting, root cause investigation and escalation to vendors or specialist teams.
• Support routing and switching technologies, including BGP, EIGRP, OSPF, VLANs, STP, ACLs and MPLS.
• Implement approved network changes, infrastructure upgrades, equipment replacements and maintenance activities.
• Coordinate network projects with internal IT teams, telecommunications providers, equipment vendors and cabling contractors.
• Conduct wireless coverage assessments and site surveys, and perform network cabling inspections and connectivity testing.
• Support Cisco Unified Communications Manager (CUCM), Cisco Unity Connection (CUC), IP phones, Cisco Jabber, Webex, voice gateways and voicemail services.
• Handle voice user provisioning, extension configuration, phone registration and moves, adds, changes and deletions (MACD).
• Troubleshoot voice service issues using call detail records, gateway logs and other diagnostic information.
• Perform preventive maintenance, configuration reviews, software and firmware upgrades, and vulnerability remediation.
• Maintain network diagrams, configuration records, asset inventories and configuration management database (CMDB) information.
• Manage incidents, service requests and change tickets within agreed service-level agreements.
• Prepare operational reports and support capacity planning, audits and service improvement activities.

Requirements

• Diploma or Degree in Information Technology, Computer Science, Computer Engineering, Telecommunications or a related discipline.
• 5-6 years of relevant experience in enterprise network engineering or infrastructure support.
• Hands‑on experience with Cisco switches, routers and wireless infrastructure.
• Working knowledge of LAN, WAN, wireless networking and the routing and switching technologies listed above.
• Experience in network monitoring, incident resolution, troubleshooting and change implementation.
• Working knowledge of Cisco enterprise voice systems, including CUCM, CUC, IP telephony and voice gateways.
• Understanding of network security, patching, vulnerability remediation and IT audit requirements.
• Ability to maintain accurate technical documentation and coordinate with vendors and internal stakeholders.
• Familiarity with Ekahau wireless survey tools and Fluke network testers would be an advantage.
• Strong problem‑solving, communication and teamwork skills.