Senior System Engineer - 24/7 Mission-Critical Ops

SCIENTE; Singapore; On-site; SGD 90,000 - 150,000; Full time

Job summary

SCIENTE is seeking a hands-on Senior System Engineer to lead and support 24x7 mission-critical systems in secure on-prem environments. You will deploy, respond to critical incidents, and perform emergency recovery with strong operational leadership.

Key duties include managing Windows servers, Active Directory, VMware virtualization, and Splunk monitoring, with a focus on security, patching, backups, and rapid root-cause analysis.

Qualifications

• 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.

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.

Skills

Windows Server

Active Directory

GPO

MS SQL Server

VMware

Layer 2/3 networking

Splunk monitoring

Backup & DR

Cybersecurity

Troubleshooting

On-site support

Tools

ESXi

vCenter

vSAN

NSX

Job description

SCIENTE is seeking a hands-on Senior System Engineer to lead and support 24x7 mission-critical systems in secure on-prem environments. You will deploy, respond to critical incidents, and perform emergency recovery with strong operational leadership.

Key duties include managing Windows servers, Active Directory, VMware virtualization, and Splunk monitoring, with a focus on security, patching, backups, and rapid root-cause analysis.