Senior Engineer, Network & Telephony

Job Description: Senior Network Engineer (5-8 Years Experience)

Position Title

Senior Network Engineer

Location

Singapore

Employment Type

Full-Time

Job Summary

We are seeking a highly skilled Senior Network Engineer with 5 to 8 years of experience in enterprise network infrastructure design, implementation, and support. The ideal candidate will possess strong expertise in Cisco and Huawei networking technologies, Cisco Unified Communications Manager (CUCM), F5 Load Balancers, and enterprise-grade routing and switching environments. The candidate will play a key role in maintaining network availability, performance optimization, troubleshooting, and driving infrastructure improvement initiatives.

Key Responsibilities

Network Infrastructure Management

• Design, implement, maintain, and support enterprise LAN, WAN, WLAN, and Data Center networks.
• Configure and troubleshoot Cisco and Huawei network devices, including routers, switches, and wireless infrastructure.
• Monitor network performance and ensure high availability and reliability of network services.
• Perform network capacity planning, upgrades, and technology refresh activities.

Routing & Switching

• Configure and manage Layer 2 and Layer 3 network services.
• Implement and troubleshoot routing protocols such as:
  • OSPF
  • BGP
  • EIGRP
  • Static Routing
• Configure VLANs, STP, EtherChannel, HSRP/VRRP, and network redundancy solutions.
• Conduct root cause analysis for network incidents and performance issues.

Cisco Unified Communications (CUCM)

• Administer and support Cisco Unified Communications Manager (CUCM).
• Manage IP Telephony infrastructure, SIP trunks, voice gateways, and call routing.
• Troubleshoot voice quality issues, call failures, and telephony-related incidents.
• Support integrations with collaboration and communication platforms.

F5 Load Balancer Administration

• Configure and manage F5 BIG-IP Load Balancers.
• Create and maintain Virtual Servers, Pools, Health Monitors, and SSL profiles.
• Troubleshoot application delivery and load balancing issues.
• Implement high availability and traffic optimization solutions.

Operations & Support

• Provide Level 2/Level 3 support for network and voice infrastructure.
• Participate in incident management, problem management, and change management processes.
• Create and maintain network documentation, diagrams, and operational procedures.
• Work closely with security, infrastructure, and application teams to ensure seamless service delivery.
• Participate in on-call support and maintenance activities as required.

Required Qualifications

• Bachelor's Degree in Computer Science, Information Technology, Telecommunications, or related field.
• 5 to 8 years of hands-on experience in enterprise network engineering.
• Strong experience with:
  • Cisco Routing and Switching
  • Huawei Campus and DC Routing and Switching
  • Cisco Unified Communications Manager (CUCM)
  • F5 BIG-IP Load Balancers
• Extensive knowledge of TCP/IP, DNS, DHCP, NAT, VPN, and QoS.
• Experience with network monitoring and troubleshooting tools.
• Strong analytical and problem-solving skills.
• Excellent communication and stakeholder management abilities.

Preferred Certifications

One or more of the following certifications are highly desirable:

• Cisco CCNP Enterprise
• Cisco CCNA
• CCNP Collaboration
• Huawei HCIP / HCIE
• F5 Certified BIG-IP Administrator (F5-CA)
• ITIL Foundation

Technical Skills

Networking

• Cisco Catalyst, Nexus, ISR, ASR
• Huawei Campus and DC Cloud Engine Switches
• Routing Protocols: OSPF, BGP, EIGRP
• VLAN, STP, VTP, HSRP, VRRP
• MPLS, VPN, QoS

Voice & Collaboration

• Cisco CUCM
• SIP
• Voice Gateways
• Cisco IP Phones
• UCCX (Preferred)

Load Balancing

• F5 BIG-IP LTM
• SSL Offloading
• Traffic Management
• High Availability Configuration

Monitoring & Tools

• SolarWinds
• PRTG
• Wireshark
• Cisco DNAC
• Network Performance Monitoring Tools

Key Competencies

• Network Troubleshooting
• Technical Leadership
• Incident & Problem Management
• Infrastructure Design
• Customer Focus
• Stakeholder Management
• Documentation & Reporting
• Team Collaboration

Nice-to-Have

• Experience in large enterprise or data center environments.
• Knowledge of network security technologies such as Firewalls, NAC, Cisco ISE.
• Experience with cloud networking ( AWS).
• Exposure to network automation tools such as Python, Ansible, or Cisco DNA Center.

Experience Required: 5-8 Years

Seniority Level: Senior Engineer / Senior Network Engineer