Senior System Manager - 24x7 Mission-Critical Infra

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

Job summary

SCIENTE is seeking an experienced System Manager to lead a 24x7 mission-critical infrastructure. You will manage a team of system engineers, ensuring high availability, robust security, incident recovery, and continuous service improvement.

You will coordinate with the Service Delivery Manager to plan maintenance, patching, upgrades, and disaster recovery exercises, while driving incident analysis and root cause resolution. After-hours support is expected in this role.

Qualifications

• Degree/Diploma in Computer Science, IT, Computer Engineering, or related field.
• Must have 6 years of experience in enterprise infrastructure, systems administration, or mission-critical environments, include 3 years of leading a team.
• Must have 3 years of experience managing Operations & Maintenance (O&M) activities for critical systems.
• Strong hands-on experience with Windows Server 2019+/Windows 11, Active Directory, GPO, Microsoft CA, PKI, and SSL/TLS certificate management.
• Must have VMware experience, including ESXi, vCenter, vSAN, and vSAN Stretch Cluster.
• Hands-on experience in patch management, including WSUS Offline and manual WSUS catalogue imports.
• Hands-on experience with Microsoft SQL Server, endpoint security (Trellix/SEP), cybersecurity technologies, and enterprise backup/restore solutions.
• Experience troubleshooting 24x7 mission-critical, highly available, on-premise environments, including critical incidents and service recovery, is essential.
• Willingness to support after-hours deployments, maintenance windows, and on-call duties.

Responsibilities

• Lead day-to-day operations of a 24x7 mission-critical system with a team of system engineers.
• Manage system availability, performance, security, and operational readiness.
• Work closely with the Service Delivery Manager (SDM) to plan and execute maintenance, patching, upgrades, and service improvement initiatives.
• Lead incident response, root cause analysis, service recovery, and operational reporting activities with the SDM.
• Review and approve deployment plans, impact assessments, risk evaluations, and rollback strategies.
• Manage infrastructure lifecycle activities, including server, workstation, virtualization, network, and COTS software upgrades.
• Ensure compliance with cybersecurity, backup, disaster recovery, and configuration management requirements.
• Identify operational risks, technology gaps, and potential single points of failure, and implement effective mitigation measures.
• Provide technical leadership, mentoring, and guidance to the operations team.
• Engage stakeholders, customers, and vendors on operational matters and service delivery performance.

Skills

Team leadership

System administration

Incident management

After-hours support

Education

Degree/Diploma in Computer Science or related field

Tools

Windows Server 2019+

Active Directory / GPO

Microsoft CA / PKI / SSL/TLS

VMware ESXi / vCenter / vSAN

WSUS

SQL Server

Endpoint security (Trellix/SEP)

Job description

SCIENTE is seeking an experienced System Manager to lead a 24x7 mission-critical infrastructure. You will manage a team of system engineers, ensuring high availability, robust security, incident recovery, and continuous service improvement.

You will coordinate with the Service Delivery Manager to plan maintenance, patching, upgrades, and disaster recovery exercises, while driving incident analysis and root cause resolution. After-hours support is expected in this role.