IT Infrastructure Executive – Infrastructure Operations

SBS Transit Limited; Singapore; Hybrid; SGD 90,000 - 130,000; Full time

Job summary

SBS Transit Limited is seeking a System Administrator & Engineer to maintain and optimize our hybrid infrastructure, ensuring reliability, performance, and security across on-premises data centers and AWS cloud environments. You will support mission-critical applications, manage AD, virtualization, storage, and backup, and drive operational excellence.

You will collaborate with IT teams, participate in audits, and contribute to change control, incident response, and documentation to ensure

Qualifications

• Bachelor’s degree required in IT or CS.
• 5+ years in system administration or infrastructure roles.
• Experience managing hybrid on-prem and AWS environments.

Responsibilities

• System Administration: manage Windows Server, patching, performance tuning.
• Active Directory & Identity Management: admin AD, GPOs, domain services.
• Data Center Operations: oversee on-prem data centers, uptime and security.
• Cloud & Hybrid Operations: support workloads in AWS; automation and IaC tasks.
• Monitoring & Documentation: implement monitoring tools and maintain docs.

Skills

Problem solving

Communication skills

Independent work

Team collaboration

Documentation skills

Education

Bachelor’s degree in Information Technology, Computer Science, or related field

Tools

Windows Server

Active Directory

Nutanix

VMware

Lenovo

Oracle

MS SQL

AWS

Cohesity

Cisco

Aruba

Huawei

SingTel MegaPop

Check Point

Palo Alto

Pulse Secure VPN

Proxies

Cisco SASE

Terraform

CloudFormation

PowerShell

Bash

Job description

The System Administrator & Engineer is responsible for maintaining and optimizing the company’s hybrid infrastructure, ensuring the reliability, performance, and security of systems across on-premises data centers and cloud environments. This role supports mission-critical applications and services, with a strong focus on system integrity, identity management, and operational excellence.

Major Responsibilities

• System Administration

  • Manage and maintain Windows Server environments, including patching, performance tuning, and troubleshooting.

  • Administer and support MS SQL and Oracle databases in collaboration with database teams.

  • Operate and monitor Nutanix and VMWare clusters to ensure high availability and optimal resource utilization.

  • Manage systems changes through change request process and respond promptly to incident, investigate and provide temporary and/or permanent resolution.

  • Provide support outside of business hours, weekends, public holidays, non-working days (when required) for planned maintenances, unplanned outages, ad-hoc activities.

• Active Directory & Identity Management

  • Administer Active Directory (AD), including user and group management, GPOs, OU structure, and domain services.

  • Ensure secure and efficient identity and access management across systems and applications.

  • Support integration of AD with cloud services and security platforms.

• Data Center Operations

  • Oversee daily operations of on-premises data centers, ensuring uptime, environmental monitoring, and physical security.

  • Coordinate hardware installations, upgrades, and maintenance for servers, storage, and networking equipment.

  • Maintain inventory of data center assets and ensure proper documentation of configurations and changes.

  • Collaborate with vendors and service providers for support and lifecycle management of infrastructure components.

• Cloud & Hybrid Operations

  • Support workloads hosted in AWS, including EC2, S3, RDS, and VPC configurations.

  • Assist in cloud provisioning, automation, and migration tasks using infrastructure-as-code tools.

  • Troubleshoot and resolve any issues that may arise within on-premises and cloud infrastructure.

  • Participate and contribute during regular audit activities on the IT infrastructure to ensure compliance.

• Storage & Backup

  • Manage Dell storage systems, including provisioning, performance monitoring, and capacity planning.

  • Operate and maintain Cohesity backup systems, ensuring data protection and recovery readiness, and compliance with industry backup governance and policy.

• Network & Connectivity (preferred and not mandatory)

  • Collaborate with network teams to support WAN connectivity across sites using Cisco, Aruba, Huawei, and SingTel MegaPop solutions.

  • Monitor and troubleshoot network break fix and performance issues and assist in configuration changes.

  • Manage the lifecycle of networking components.

• Security & Compliance

  • Support firewall operations (Check Point, Palo Alto), VPN (Pulse Secure, Check Point), proxy, and SASE systems (preferred and not mandatory).

  • Ensure systems comply with security policies and assist in vulnerability remediation.

  • Participate and support annual DR, Data Recovery, and cyber exercises.

• Monitoring & Documentation

  • Implement and maintain system monitoring tools and dashboards.

  • Document configurations, procedures, and incident reports for operational transparency and knowledge sharing.

Requirements:

Education & Experience

• Bachelor’s degree in Information Technology, Computer Science, or related field.

• 5+ years of experience in system administration or infrastructure engineering roles.

• Experience in managing hybrid environments (on-prem and AWS cloud).

Technical Skills

• Proficiency in:

  • Operating Systems: Windows Server

  • Directory Service: Active Directory, user/group management, GPOs, domain services

  • Virtualization & Storage: Nutanix, VMWare, Lenovo

  • Databases: Oracle, MS SQL (preferred and not mandatory)

  • Cloud Platforms: AWS

  • Backup Systems: Cohesity or similar

  • Networking: Familiarity with Cisco, Aruba, Huawei, SingTel MegaPop (preferred and not mandatory)

  • Security Tools: Check Point, Palo Alto, Pulse Secure VPN, proxies, Cisco SASE (preferred and not mandatory)

• Experience with scripting (PowerShell, Bash) and automation tools is a plus.

• Familiarity with infrastructure-as-code (e.g., Terraform, CloudFormation) and automation tools is a plus.

Soft Skills

• Strong problem-solving and troubleshooting abilities.

• Good communication and documentation skills.

• Ability to work independently and collaboratively in a fast-paced environment.