Senior Network Engineer (L3)

NTT Limited; Singapore; On-site; SGD 90,000 - 140,000; Full time

Benefits offered by this job

On-site workplace

Job summary

NTT DATA in Singapore is seeking a Managed Services Cross Technology Engineer (L3/4) to ensure client IT infrastructure remains operational. You will handle escalated incidents, perform root-cause analysis, and coordinate across teams to deliver rapid resolutions within SLA.

The role spans across Cloud, Security, Networking, Applications, and Collaboration with opportunities to contribute to projects. On-site work is expected.

Qualifications

• Experience in managing large-scale network infrastructures.
• Familiar with ITIL incident/change management processes.
• Ability to coordinate across cross-functional teams and vendors.

Responsibilities

• Provides Level 3 operational support for large-scale enterprise data center and campus networks.
• Troubleshoots complex network issues and ensures SLA adherence.
• Maintains network diagrams and deployment guides.
• Collaborates with Level 1/2 teams and vendors.
• Performs incident management and root-cause analysis.

Skills

Network engineering

Incident management

ITIL practices

Vendor management

Tools

Cisco Catalyst/Nexus

ACI

SD-WAN

Network diagram tooling

Job description

Make an impact with NTT DATA Join a company that is pushing the boundaries of what is possible. We are renowned for our technical excellence and leading innovations, and for making a difference to our clients and society. Our workplace embraces diversity and inclusion – it’s a place where you can grow, belong and thrive. The Managed Services Cross Technology Engineer (L3/4) – is a network engineering role, responsible for ensuring a managed service is provided to all clients, to ensure that their IT infrastructure and systems remain operational.

This is done through proactively managing, overseeing, monitoring, investigating, and resolving escalated technical incidents and problems to ensure the restoration of these services to the clients. The primary objective of this role is to proactively review all client requests or tickets and apply technical process knowledge to provide the clients with almost immediate resolution without breaching service level agreement (SLA). The Managed Services Cross Technology Engineer (L3/4) – System focuses on forth line support for escalated incidents and requests with a high level of complexity. Ensures contracted Managed Services outcomes are delivered to the client. This is a strategic role focusing across various technology domains such as (but not limited to) Cloud, Security, Networking, Applications and / or Collaboration. This role may also contribute to / support on project work as and when required.

Key Responsibilities

• Works independently, with general direction from the client, stakeholders, team lead, or senior manager, to perform operational tasks to resolve all escalated incidents/requests in a timely manner within the agreed SLA.
• Provides Level 3 operational support for large-scale enterprise data center and campus network environments, ensuring high availability, performance, and service continuity.
• Managed and supported complex network infrastructures comprising Cisco, Alcatel, HP, and 3Com switches and routers across Layer 2, Layer 3, and enterprise core network environments.
• Administered Cisco networking platforms including Catalyst, Nexus (NX-OS), Application Centric Infrastructure (ACI), and SD-WAN technologies.
• Performed incident management, troubleshooting, root cause analysis, and break-fix activities in accordance with service level agreements (SLAs) and operational procedures.
• Collaborated closely with Level 1 and Level 2 support teams to diagnose and resolve complex network, connectivity, and infrastructure issues.
• Conducted proactive network monitoring, operational health checks, performance analysis, capacity planning, and service availability reporting.
• Supported network engineering activities, including implementation of configurations for new infrastructure deployments, system enhancements, and technology refresh projects.
• Planned and executed hardware refresh initiatives involving End-of-Life (EOL) and End-of-Support (EOS) network devices to maintain infrastructure reliability and vendor support compliance.
• Managed firmware lifecycle activities, including vulnerability assessments, security reviews, testing, change implementation, and production upgrades across Cisco platforms.
• Participated in infrastructure modernization and network optimization projects to improve scalability, security, and operational efficiency.
• Supported security governance initiatives by assisting with compliance audits, vulnerability remediation, technical documentation, and audit evidence collection.
• Coordinated with vendors, third-party service providers, and technical support teams to resolve critical incidents and implement infrastructure changes.
• Assisted in service request fulfillment, network provisioning, and operational support activities while ensuring adherence to established standards and procedures.
• Coordinated maintenance activities and data center access requirements for vendors performing hardware and software upgrades.
• Developed and maintained network diagrams, technical documentation, operational procedures, deployment guides, and as-built documentation.
• Followed ITIL best practices for Incident, Change, Problem, and Release Management to ensure stable and effective service delivery.

Key Technologies

• Cisco Catalyst, Nexus (NX-OS), ACI, SD-WAN
• Alcatel, HP, 3Com
• Network Infrastructure
• Enterprise Data Center & Campus Networks
• Routing & Switching (Layer 2/Layer 3)
• Network Monitoring & Troubleshooting
• Firmware & Vulnerability Management
• Network Security & Compliance
• ITIL Service Management
• Infrastructure Refresh & Migration Projects
• Technical Documentation & Operational Reporting
• Vendor & Stakeholder Management

Key Achievements

Successfully supported and maintained mission-critical enterprise network infrastructure with high service availability and operational stability. Delivered multiple network enhancement, hardware refresh, and firmware upgrade projects with minimal business impact. Improved operational efficiency through proactive monitoring, root cause analysis, and compliance-driven network management practices. Contributed to security and audit readiness by supporting infrastructure governance, vulnerability remediation, and compliance initiatives.

Workplace type: On-site Working

About NTT DATA

NTT DATA is a $30+ billion business and technology services leader, serving 75% of the Fortune Global 100. We are committed to accelerating client success and positively impacting society through responsible innovation. We are one of the world’s leading AI and digital infrastructure providers, with unmatched capabilities in enterprise-scale AI, cloud, security, connectivity, data centers and application services. Our consulting and industry solutions help organizations and society move confidently and sustainably into the digital future. As a Global Top Employer, we have experts in more than 70 countries. We also offer clients access to a robust ecosystem of innovation centers as well as established and start-up partners. NTT DATA is part of NTT Group, which invests over $3 billion each year in R&D.

Equal Opportunity Employer NTT DATA is proud to be an Equal Opportunity Employer with a global culture that embraces diversity. We are committed to providing an environment free of unfair discrimination and harassment. We do not discriminate based on age, race, colour, gender, sexual orientation, religion, nationality, disability, pregnancy, marital status, veteran status, or any other protected category.

Join our growing global team and accelerate your career with us.

Is innovation part of your DNA? Do you want to enable a connected future for people, organizations, and society? Join our growing global NTT family and you’ll be part of the world’s largest ICT company (by revenue). We’ve combined the capabilities of 28 remarkable companies to become one, leading technology services provider. Together, we help our people, clients, and communities do great things with technology to create a more secure and connected future. We employ 40,000 people across 57 countries. By bringing together the world’s best technology companies and emerging innovators, we work together to deliver sustainable outcomes to businesses and the world. Innovation is part of our DNA. We believe it’s key to what makes us different. So, we strive to move forward, challenge the status quo, and drive excellence through the technologies we integrate and the services we deliver around the world. The result is connected cities, connected factories, connected healthcare, connected agriculture, connected conservation, connected mobility, and connected sport. Together we enable the connected future. You’ll be joining a global employer that is committed to attracting, growing and keeping the best talent. A place where you will be at the heart of our success!