Senior Network Engineer

NXERA SG PTE. LTD.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

NXERA SG PTE. LTD. in Singapore seeks a Senior Network Engineer to lead design, deployment, and operation of critical data centre networks. You will drive scalable, secure architectures across IT and OT domains, including DWDM and cyber security governance.

You will collaborate with Cybersecurity, Data Centre OT, IT Infra and Analytics teams to deliver resilient, low-latency networks, implement automation with Python/Ansible, and mentor engineers through architecture reviews and project delivery.

Qualifications

• Senior-level network engineering experience in data centre environments.
• Proven ability to design, deploy and secure large-scale enterprise networks.
• Experience with DWDM, OT security, and cybersecurity governance.

Responsibilities

• Design, implement, and operate enterprise WAN/LAN/WLAN, DWDM and security infrastructure.
• Lead network architecture reviews for new data centres and regional deployments.
• Mentor engineers and drive automation initiatives using Python, Ansible, REST APIs.

Skills

Networking

Security leadership

Automation

Team leadership

Education

Bachelor's degree in IT or related field

Tools

Cisco

Juniper

Fortinet

Arista

Job description

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.

Working closely with Cybersecurity, Data Centre OT, Data Centre Operations, IT Infrastructure, and Data Analytics teams, you will deliver secure, resilient, and scalable network solutions that support business growth and operational excellence.

How You will Make An Impact:

Data Centre Architecture & Physical Infrastructure:

• 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.
• Collaborate with project stakeholders to ensure network solutions meet business, operational, resilience, and scalability requirements.

Cybersecurity Leadership & Operational Technology (OT) Security

• 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.
• Implement and manage secure one-way communication technologies, such as Data Diodes, to maintain secure data flows from OT to IT environments where applicable.
• Design and manage enterprise network security infrastructure, including firewalls and centralised authentication platforms such as RADIUS and TACACS+.
• Ensure network designs comply with organisational cybersecurity policies, recognised industry standards (e.g. ISO/IEC 27001 and SOC 2), applicable regulatory requirements, and internal security assessments, including penetration testing and vulnerability assessments.
• Develop, maintain, and continuously improve cybersecurity incident response frameworks and standard operating procedures (SOPs) for data centre environments.

Network Engineering & Automation

• Design, implement, and support enterprise WAN, LAN, WLAN, firewall, and DWDM network solutions.
• Lead detailed network designs for enterprise IT and Operational Technology (OT) environments across multiple data centres.
• Manage and optimise the global enterprise network backbone, including DWDM (Dense Wavelength Division Multiplexing) optical transport infrastructure.
• Configure, manage, and troubleshoot enterprise routing and switching platforms, including Cisco, Juniper, Fortinet, Arista, or equivalent technologies.
• Design and support highly available, low-latency, and resilient enterprise network infrastructure for mission-critical environments.
• Implement network segmentation and security controls to securely isolate OT and IT environments using unidirectional gateway technologies where appropriate.
• Collaborate with Data Centre OT and Data Centre Security teams to align network architecture with operational continuity, safety, cybersecurity, and compliance requirements.
• Design and implement network automation and orchestration solutions using Python, Ansible, REST APIs, or equivalent technologies to improve provisioning, configuration management, and operational efficiency.
• Utilise Linux operating systems for network diagnostics, automation, scripting, and systems integration.

Operations, Troubleshooting & Incident Management

• Serve as the technical escalation point for complex enterprise networking and cybersecurity incidents.
• Perform root cause analysis and implement corrective and preventive actions.
• Lead network maintenance, upgrades, migrations, and change activities while minimising service disruption.
• Monitor enterprise network performance, availability, and capacity, recommending continuous improvements where appropriate.
• Participate in an on-call and technical escalation rotation as required.

Leadership, Strategy & Project Management

• Lead end-to-end infrastructure projects, including planning, budget forecasting (CAPEX/OPEX), resource allocation, scheduling, and delivery.
• Mentor and develop network engineers through coaching, technical guidance, and knowledge sharing.
• Develop and present strategic network architecture proposals and technical presentations supporting enterprise and cloud-based data cen