Senior Network Engineer, Data Center

Singapore Telecommunications Limited; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Singapore Telecommunications Limited is seeking an experienced Senior Network Engineer to lead design, implementation, and operation of enterprise network infrastructure across data centre environments. The role requires expertise in DWDM, OT, cybersecurity, and network automation.

You will guide architecture reviews for new local and regional data centre developments, mentor teams, and serve as the escalation point for complex networking incidents.

Qualifications

• Extensive experience designing, implementing, and managing mission-critical enterprise networking, data centre infrastructure, and OT environments.
• Proven experience leading technical teams across networking, physical infrastructure deployment, or cybersecurity functions.
• Experience in data centre or hyperscale enterprise environments.
• Strong knowledge of routing and switching (BGP, OSPF, MPLS, SRv6).
• Experience with monitoring/telemetry platforms such as SolarWinds.
• Hands-on experience with Cisco, Juniper, Fortinet, Arista, plus DWDM, Data Diodes, and enterprise firewall solutions.
• Proficiency in network automation using Python, Ansible, REST APIs or similar.
• Working knowledge of Linux for networking, automation, and systems integration.
• Active CCIE or equivalent advanced cert is highly preferred.
• Excellent communication and stakeholder management.

Responsibilities

• Participate as a core member of the design team for new local and regional data centre deployments, ensuring network and security architectures are incorporated throughout the design lifecycle
• Act as the primary networking subject matter expert for Data Centre teams, providing structural, logical, and connectivity solutions for enterprise deployments
• Lead the physical network design of carrier-neutral colocation facilities, including Meet-Me Room (MMR), Main Distribution Frame (MDF), structured cabling, and interconnection architecture
• Lead and manage the enterprise cybersecurity team responsible for network security strategy, architecture, governance, and operational security
• Design, implement, and manage secure network segmentation between IT and OT environments
• Design and manage enterprise network security infrastructure, including firewalls and centralised authentication platforms such as RADIUS and TACACS+
• Design, implement, and support enterprise WAN, LAN, WLAN, firewall, and DWDM network solutions
• Manage and optimise the global enterprise network backbone, including DWDM optical transport infrastructure
• Design and implement network automation and orchestration solutions using Python, Ansible, REST APIs, or equivalent technologies to improve provisioning, configuration management, and operational efficiency
• Serve as the technical escalation point for complex enterprise networking and cybersecurity incidents

Skills

Data centre infra

Enterprise networking

DWDM

Network security

Python automation

Ansible

REST APIs

Linux

CCIE

Mentoring

Tools

Cisco

Juniper

Fortinet

Arista

DWDM

Data Diodes

SolarWinds

Job description

About the role

We are seeking an experienced Senior Network Engineer to lead the design, implementation, operation, and continuous improvement of enterprise network infrastructure supporting mission-critical and highly resilient data centre environments. This role requires a comprehensive technical background spanning physical infrastructure (DWDM and Data Centre OT), enterprise IT backbone networking, cybersecurity, and network automation. The successful candidate will oversee the enterprise IT network backbone, lead the Data Centre Cybersecurity team, and drive network architecture reviews for new local and regional data centre developments.

Key responsibilities

• Participate as a core member of the design team for new local and regional data centre deployments, ensuring network and security architectures are incorporated throughout the design lifecycle
• Act as the primary networking subject matter expert for Data Centre teams, providing structural, logical, and connectivity solutions for enterprise deployments
• Lead the physical network design of carrier-neutral colocation facilities, including Meet-Me Room (MMR), Main Distribution Frame (MDF), structured cabling, and interconnection architecture
• Lead and manage the enterprise cybersecurity team responsible for network security strategy, architecture, governance, and operational security
• Design, implement, and manage secure network segmentation between IT and OT environments
• Design and manage enterprise network security infrastructure, including firewalls and centralised authentication platforms such as RADIUS and TACACS+
• Design, implement, and support enterprise WAN, LAN, WLAN, firewall, and DWDM network solutions
• Manage and optimise the global enterprise network backbone, including DWDM (Dense Wavelength Division Multiplexing) optical transport infrastructure
• Design and implement network automation and orchestration solutions using Python, Ansible, REST APIs, or equivalent technologies to improve provisioning, configuration management, and operational efficiency
• Serve as the technical escalation point for complex enterprise networking and cybersecurity incidents

About you

• Extensive experience designing, implementing, and managing mission-critical enterprise networking, data centre infrastructure, and Operational Technology (OT) environments
• Proven experience leading technical teams across networking, physical infrastructure deployment, or cybersecurity functions
• Experience working in data centre, hyperscale network, or equivalent enterprise environments
• Strong knowledge of enterprise routing and switching technologies, including BGP, OSPF, MPLS, and SRv6
• Experience with enterprise network monitoring and telemetry platforms such as SolarWinds or equivalent tools
• Extensive hands‑on experience with enterprise networking platforms such as Cisco, Juniper, Fortinet, Arista, or equivalent technologies, together with DWDM optical transport, Data Diodes, and enterprise firewall solutions
• Proficiency in network automation using Python, Ansible, REST APIs, or similar technologies
• Working knowledge of Linux operating systems for networking, automation, and systems integration
• Active CCIE certification or an equivalent advanced networking certification is highly preferred
• Excellent communication, stakeholder management, and technical mentoring skills