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