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