System Support Specialist III - SGP

One Stop Engineering; Singapore; On-site; SGD 90,000 - 140,000; Full time

Job summary

One Stop Engineering is seeking a senior IT systems support specialist to act as the primary escalation point for complex incidents and drive root-cause analyses with vendors. You will lead go-live, hypercare, and stabilization activities, ensuring robust monitoring and cross-functional coordination.

You will mentor junior staff, oversee change control, and ensure compliant testing and documentation across Windows, macOS, Linux, AD, Azure, Intune, and SaaS tools.

Qualifications

• Bachelor's degree in CS/IT or related field required.
• 7+ years of relevant technical support experience in enterprise environments.
• Experience with large-scale IT infrastructure and SaaS tools.

Responsibilities

• Act as primary escalation point for complex system incidents and drive RCAs with vendors and stakeholders.
• Lead system go-live, hypercare, and stabilization activities with monitoring and cross-functional coordination.
• Oversee change control processes and release readiness review support.
• Govern system configuration, access lifecycle, and periodic recertification for compliance.
• Coordinate testing programmes (UAT, OQ, PQ) and ensure regulatory-quality documentation.
• Mentor System Support Specialist I & II and support capability development.

Skills

Root cause analysis

Cross-functional coordination

Go-live coordination

Mentorship

Documentation

Education

Bachelor's degree in Computer Science / IT

Tools

Active Directory

Azure

Intune

DNS

DHCP

Microsoft Exchange

TCP/IP

VPN

Okta

Google Workspaces

Slack

Zoom

O365

Windows

macOS

Linux

Data center

Job description

Description:

● Act as the primary escalation point for complex system incidents, driving root cause analysis, corrective actions, and permanent resolution in collaboration with vendors and stakeholders.
● Lead system go-live, hypercare, and stabilization activities, ensuring robust monitoring, rapid response, and effective cross-functional coordination.
● Oversee change control processes, evaluate system change impacts, and provide technical review and approval support for release readiness activities.
● Drive system configuration governance, user access lifecycle management, and periodic access recertification in accordance with compliance requirements.
● Lead and coordinate testing programmes (UAT, OQ, PQ), ensuring test strategies, defect resolution, and documentation meet regulatory and quality standards.
● Mentor and guide System Support Specialist I and II, providing technical direction and supporting capability development.
● Maintain and continuously improve support documentation, SOPs, configuration records, and technical artefacts to the highest audit-ready standards.
● Proactively identify system risks and compliance gaps, developing and implementing mitigation strategies in alignment with site quality and IT teams.
● Serve as subject matter expert in support audits, regulatory inspections, and internal reviews, providing timely and accurate information.
● Drive continuous improvement initiatives across support processes, tooling, and operational practices to enhance system reliability and efficiency.

Education & Experience

• Bachelor's degreein Computer Science, Information Technology, or a related field is often preferred or required

• Significant experience: This is a senior-level role requiring7+ yearsof relevant technical support experience

• Enterprise environment: Experience in a medium to large, complex enterprise environment is essential.
  

  • Operating Systems: Advanced knowledge ofWindows, macOS, and Linux

  • Mobile Platforms: Working knowledge ofiOS and Android

  • Networking: Advanced knowledge ofnetworkingandinformation securitytopics

  • Enterprise Tools: Working knowledge ofActive Directory, Azure, Intune, DNS, DHCP, Microsoft Exchange, TCP/IP, and VPN

  • Ticketing & SaaS: Experience with high-volume ticketing systems and in-depth knowledge of SaaS applications likeOkta, Google Workspaces, Slack, Zoom, and O365

  • Hardware & Infrastructure: Experience with data center support, including equipment installation, cabling, and inventory tracking, is often mentioned