Senior System Engineer

SINGAPORE TELECOMMUNICATIONS LIMITED; Singapore; On-site; SGD 120,000 - 190,000; Full time

Job summary

Singtel is hiring an experienced Network Architect to design and manage enterprise networks across on-premises and hybrid cloud environments. You will integrate 3rd‑party applications, configure advanced networking components, and ensure secure connectivity to data centres, public cloud, and Kubernetes clusters.

The role requires 5–10 years in network engineering, API integration experience, and familiarity with AI tools for production-grade applications, plus CCNA or equivalent certification.

Qualifications

• Bachelor's degree in computer science or equivalent.
• 5-10 years of experience in network infrastructure, platform, or systems engineering.
• Experience in mission-critical enterprise network infrastructure.
• API based System Integration experience.
• Experience using AI tools (Claude, Cursor, Codex) to develop production-grade applications.
• Possess CCNA or equivalent.
• Experience in AI training and GPU infrastructure setup.

Responsibilities

• Design and manage enterprise network architectures for on-premises and hybrid cloud environments.
• Coordinate integrations with 3rd‑party applications and vendors.
• Configure Layer 2/Layer 3 networks, VLANs, VRFs, routing, NAT, firewalls, VPNs, and load balancers.
• Design secure connectivity between data centres, public cloud, Kubernetes, and enterprise apps.
• Plan IP addressing and network segmentation.
• Troubleshoot complex network issues and document topology.
• Maintain network diagrams and system integration documentation.

Skills

Enterprise networking

API based integration

AI tools (Claude Cursor Codex)

CCNA or equivalent

AI training & GPU setup

Education

Bachelor's degree in computer science or equivalent

Job description

Singtel is where Technology meets Purpose. We're building an AI-first telco for the future-connecting people, businesses and communities through trusted networks, intelligent digital services and next-generation technology. From transforming everyday experiences in mobile, broadband, entertainment and lifestyle services to enabling enterprises with AI, 5G+, cloud, cybersecurity, data centres and digital platforms, we create the technology that powers how millions live, work and connect. At Singtel, your work creates real impact. You'll solve meaningful challenges, shape critical digital infrastructure and help build secure, resilient and AI-enabled solutions that serve businesses, digital ecosystems and communities across the globe. This is where BIG Possibilities become reality. Whether you're engineering intelligent networks, advancing sovereign AI cloud platforms, strengthening cybersecurity, designing seamless customer experiences or driving sustainable innovation, you'll be part of teams shaping the future of technology. Backed by decades of expertise and driven by a culture of continuous learning and innovation, Singtel offers the scale, opportunities and support to help you grow your career while making a difference where it matters most.

How You will Make An Impact:

• Design and manager enterprise network architectures for on-premises and hybrid cloud environments and integration architectures with partners/vendors.
• Manage the integration of 3rd part applications by working directly with the applications providers to ensure the integration interfaces, specifications and requirements are aligned externally and internally within relevant stakeholder groups and supporting systems.
• Configure and manage Layer 2 / Layer 3 networks, VLANs, VRFs, Routing (BGP, OSPF, Static Routing), NAT, Firewall Policies, VPN, Load Balancers.
• Design secure connectivity between: Data Centres, Public Cloud (AWS/Azure/GCP), Kubernetes clusters, Enterprise applications.
• Plan IP addressing strategy and network segmentation.
• Troubleshoot complex network issues.
• Maintain network documentation and topology diagrams.
• System Integration, SAML/SSO Integration, Architecture of software components, monitoring of microservices and API gateway platform, Cyber security review and application monitoring.

Skills for Success:

• Bachelor's degree in computer science or equivalent.
• 5-10 years of experience in network infrastructure engineering, platform engineering, or systems engineering.
• Experience supporting mission-critical enterprise network infrastructure.
• API based System Integration experience.
• Experience in using AI tools such as Claude, Cursor, Codex to develop production grade applications.
• Possess CCNA or equivalent.
• Experience in AI training and GPU infrastructure setup.