Senior System Engineer

SCIENTE; Singapore; On-site; SGD 90,000 - 130,000; Full time

Job summary

SCIENTE is seeking a hands-on Senior System Engineer to lead and support 24x7 mission-critical systems in secure on-premises environments. The role demands strong technical leadership and practical involvement in deployments, incidents, and emergency recovery.

Based in Singapore, you will administer Windows servers, Active Directory, VMware, and Splunk, coordinate with OEMs, and provide 24/7 Level 2 support on a scheduled rotation while handling after-hours incidents and critical recovery tasks.

Qualifications

• 3–5 years in systems administration or mission-critical environments.
• Hands-on with Windows Server, Active Directory, GPO, and MS SQL Server.
• Experience with VMware, Layer 2/3 networking, and Splunk monitoring.
• Knowledge of backup/recovery, DR, patching, and cybersecurity solutions.
• Strong troubleshooting and analytical skills; willing to provide after-hours on-site support.
• Availability for after-hours, weekends, and public holidays.

Responsibilities

• Administer and maintain Windows servers, workstations, and Active Directory environments.
• Manage antivirus definitions, security patches, OS, software, and firmware upgrades.
• Perform SSL certificate renewal and management across all components.
• Maintain VMware virtualization infrastructure including ESXi, vCenter, vSAN, and NSX.
• Monitor and manage system logs using Splunk and Syslog tools.
• Troubleshoot system issues and coordinate with OEM vendors for root cause analysis and resolution.
• Perform monthly preventive maintenance, system health checks, and reporting.
• Support system deployment and change activities during off-peak hours.
• Manage L1-L3 incident tickets and service requests.
• Provide 24/7 Level 2 operational support based on a scheduled rotation.

Skills

Systems Administration

Infrastructure Support

Mission-Critical Environments

Windows Server

Active Directory

GPO

Microsoft SQL Server

VMware

Networking (L2/L3)

Splunk Monitoring

Backup & Disaster Recovery

Cybersecurity Solutions

Troubleshooting

On-site Support

Tools

VMware ESXi/vCenter

NSX

Splunk

Job description

We are looking for a hands-on Senior System Engineer to lead and support 24x7 mission-critical systems in secure on-premises environments. The role requires strong technical expertise and operational leadership, with hands-on involvement in deployments, critical incidents, and emergency recovery activities.

Mandatory Skill Set

• Must have 3-5 years of experience in Systems Administration, Infrastructure Support, or Mission-Critical environments;
• Hands-on experience with Windows Server, Active Directory, GPO, and Microsoft SQL Server;
• Experience with VMware, Layer 2/3 networking, and Splunk monitoring;
• Knowledge of backup/recovery, disaster recovery, patching, and cybersecurity solutions;
• Strong troubleshooting, problem-solving, and analytical skills;
• Willing to provide on-site support for critical incidents and emergency recovery, including after-hours, weekends, and public holidays.

Desired Skill Set

• Experience in air-gapped, secure, or regulated environments is preferred.

Responsibilities

• Administer and maintain Windows servers, workstations, and Active Directory environments;
• Manage antivirus definitions, security patches, OS, software, and firmware upgrades;
• Perform SSL certificate renewal and management across all system components;
• Maintain and manage VMware virtualization infrastructure including ESXi, vCenter, vSAN, and NSX;
• Monitor and manage system logs using Splunk and Syslog tools;
• Troubleshoot system issues and coordinate with OEM vendors for root cause analysis and resolution;
• Perform monthly preventive maintenance, system health checks, and reporting;
• Support system deployment and change activities during off-peak hours;
• Manage L1-L3 incident tickets and service requests;
• Provide 24/7 Level 2 operational support based on a scheduled rotation.

Confidentiality is assured, and only shortlisted candidates will be notified for interviews.