Senior Network Engineer – Voice Transport & Cisco Data Center - Singapore

Infrasoft Technologies Limited; Singapore; On-site; SGD 120,000 - 170,000; Full time

Job summary

Infrasoft Technologies Limited is seeking a Senior Network Engineer with deep expertise in voice transport and Cisco data center technologies. The role covers design, deployment, and optimization of SIP, RTP, SBCs, and VoIP infrastructure across global sites, along with CUCM, CUBE, and Unity management.

You will ensure QoS, capacity planning, and performance tuning while aligning with security policies. You will architect Cisco ACI fabrics, manage Nexus platforms, implement VxLAN/EVPN, and

Qualifications

• 10–20+ years in enterprise networking with focus on voice transport and Cisco DC.
• Hands-on expertise with Cisco ACI, Nexus platforms, and DC fabric technologies.
• Strong experience with VoIP, SIP, SBCs, CUCM, CUBE, and voice quality optimization.
• Deep understanding of routing protocols, QoS, multicast, and network performance engineering.
• Experience with Infoblox DNS/DHCP/IPAM; multi-site, large-scale deployments.

Responsibilities

• Design, deploy, and support Voice Transport systems across global sites.
• Manage and optimize Cisco Collaboration platforms (CUCM, CUBE, Unity, IM&P).
• Maintain dial plans, call routing, QoS policies, and voice quality SLAs.
• Architect Cisco DC networking including ACI, Nexus, VXLAN, and EVPN.
• Lead L2/L3 network design, routing policies, and incident resolution.

Skills

Voice transport

Cisco DC

VoIP/SIP

CUCM/CUBE

Nexus/DC fabric

ACI

BGP/OSPF/EIGRP

QoS & traffic engineering

Infoblox DNS/DHCP/IPAM

SLA & performance tuning

Tools

Cisco ACI

Cisco Nexus

Infoblox DNS/DHCP/IPAM

Job description

Senior Network Engineer – Voice Transport & Cisco Data Cente

Key Responsibilities

Voice Transport & Unified Communications

• Design, deploy, and support Voice Transport systems including SIP, RTP, SBCs, PRI gateways, and VoIP infrastructure across global sites


• Manage and optimize Cisco Collaboration platforms (CUCM, CUBE, Unity, IM&P)


• Maintain dial plans, call routing, QoS policies, codec strategies, and voice quality SLAs


• Integrate voice systems with WAN, SD-WAN, MPLS, and cloud telephony platforms


• Conduct voice traffic analysis, capacity planning, and performance tuning

Cisco Data Center Networking

• Architect and operate Cisco ACI fabrics, including multi-pod/multi-site deployments


• Manage Cisco Nexus platforms (9K/7K/5K), vPC, VXLAN, EVPN, and spine-leaf architectures


• Implement segmentation, micro-segmentation, and security policies


• Support DC migrations, new plant deployments, and compute/storage integration


• Ensure high availability, redundancy, and disaster recovery readiness

Enterprise Network Engineering

• Lead L2/L3 network design using BGP, OSPF, EIGRP, MPLS, VRF, and advanced routing policies


• Implement QoS, traffic engineering, and performance optimization


• Manage DNS/DHCP/IPAM platforms (Infoblox preferred)


• Develop HLD/LLD, network diagrams, test plans, and operational runbooks


• Drive incident resolution, root-cause analysis, and continuous improvement

Security, Compliance & Governance

• Apply cybersecurity standards across voice and DC environments (ACLs, segmentation, encryption)


• Collaborate with security teams on audits, compliance checks, and vulnerability remediation


• Ensure designs comply with global IT policies and regulatory frameworks

Required Skills & Experience

• 10–20+ years in enterprise network engineering with focus on voice transport and Cisco DC


• Hands-on expertise with Cisco ACI, Nexus platforms, and DC fabric technologies


• Strong experience with VoIP, SIP, SBCs, CUCM, CUBE, and voice quality optimization


• Deep understanding of routing protocols, QoS, multicast, and network performance engineering


• Experience with Infoblox DNS/DHCP/IPAM


• Proven experience supporting large-scale, multi-site enterprise networks (manufacturing/automotive preferred)


• Strong documentation and architecture skills

Preferred Certifications

• CCNP/CCIE (Routing & Switching, Data Center, Collaboration)


• Cisco ACI Specialist certifications


• Voice/UC certifications (Collaboration track)