System Manager

SCIENTE; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

SCIENTE is seeking an experienced System Manager to oversee a 24x7 mission-critical infrastructure, leading a team of system engineers to ensure availability and resilience. You will drive incident response, patching, security hardening, and disaster recovery, collaborating with SDM to deliver reliable IT services and continuous improvement across on-prem environments.

The role requires strong leadership, deep Windows and VMware expertise, and coordination with vendors during after-hours

Qualifications

• Degree/diploma in CS/IT/Computer Engineering or related field.
• 6 years of enterprise infrastructure experience with 3 years leading a team.
• 3 years of O&M experience for critical systems.
• Strong hands-on with Windows Server 2019+/Windows 11, Active Directory, GPO, PKI, and SSL/TLS management.
• VMware experience: ESXi, vCenter, vSAN.
• WSUS Offline and manual WSUS catalogue imports.
• SQL Server, endpoint security, cybersecurity technologies, and backup/restore.
• Experience troubleshooting 24x7 mission-critical on-prem environments.
• 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 engineers.
• Manage system availability, performance, security, and readiness.
• Coordinate maintenance, patching, upgrades with SDM.
• Lead incident response, root cause analysis, recovery with SDM.
• Review deployment plans, impact assessments, risk, and rollback strategies.
• Oversee infrastructure lifecycle: servers, virtualization, network, and upgrades.
• Ensure cybersecurity, backup, DR, and configuration management compliance.
• Identify risks and single points of failure; implement mitigations.
• Provide technical leadership and mentoring to the operations team.
• Engage stakeholders, customers, and vendors on service delivery.

Skills

Leadership

Incident management

24x7 operations

Cybersecurity

Disaster recovery

Patch management

Stakeholder communication

Troubleshooting

Education

Degree/Diploma in CS/IT/Computer Engineering

Tools

VMware ESXi

vCenter

vSAN

WSUS Offline

Windows Server 2019+

Active Directory

GPO

PKI

SSL/TLS certificates

SQL Server

Endpoint security (Trellix/SEP)

Backup/Restore solutions

Job description

We are looking for an experienced System Manager to manage 24x7 mission-critical infrastructure, leading system/application engineers and ensuring availability, cybersecurity, incident recovery, and operational continuity.

Mandatory Skill-set

• 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.

Desired Skill-set

• Good to have experience in Splunk Enterprise / Syslog / Kiwi Syslog VMware NSX.
• Aviation systems experience in airport operations, air traffic management, surveillance, or aviation support systems.

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.

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