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