Lead System Engineer – WINTEL / RHEL

RAPSYS TECHNOLOGIES PTE. LTD.; Singapore; On-site; SGD 70,000 - 110,000; Full time

Job summary

RAPSYS TECHNOLOGIES PTE. LTD. is seeking an IT infrastructure professional to design, deploy, and manage Windows Server and RHEL environments in Singapore. The role covers security hardening, automation development, and incident support across on-premises systems.

The ideal candidate has 3–5 years of hands-on experience, strong documentation skills, and ITIL certification. Join a team focused on reliability, scalability, and collaboration with cross-functional stakeholders.

Qualifications

• 3–5 years of experience in IT infrastructure administration, operations, or support.
• Hands-on experience with Windows Server / Wintel administration.
• Hands-on experience with Red Hat Enterprise Linux (RHEL).
• ITIL Foundation certification.
• Diploma/Degree in Computer Science, IT, Computer Engineering, or related field.

Responsibilities

• Design, deploy, and manage Windows Server and RHEL infrastructure.
• Perform system administration including user management, access controls, patching, and security hardening.
• Develop automation using PowerShell, Bash, and Python.
• Monitor system performance and optimise infrastructure reliability and resource utilisation.
• Troubleshoot complex technical issues and provide timely resolution.
• Manage virtualisation platforms and storage solutions, including configuration and capacity planning.
• Support infrastructure changes, upgrades, and cross-functional implementation activities.
• Maintain detailed technical documentation, procedures, and architectural records.
• Conduct security assessments and implement infrastructure security best practices.
• Participate in incident management and provide on-call support when required.
• Keep updated with emerging technologies and recommend infrastructure improvements.

Skills

Windows Server administration

RHEL administration

Automation scripting: PowerShell, Bash

Communication skills

Education

Diploma/Degree in Computer Science, IT, Computer Engineering, or related field

ITIL Foundation certification

Tools

IBM AIX

IBM Spectrum Protect

CyberArk

IBM QRadar

Symantec EDR

IBM Tivoli Monitoring

RSA security solutions

Job description

Key Responsibilities

• Design, deploy, and manage Windows Server and RHEL infrastructure.
• Perform system administration including user management, access controls, patching, and security hardening.
• Develop automation using PowerShell, Bash, and Python.
• Monitor system performance and optimise infrastructure reliability and resource utilisation.
• Troubleshoot complex technical issues and provide timely resolution.
• Manage virtualisation platforms and storage solutions, including configuration and capacity planning.
• Support infrastructure changes, upgrades, and cross-functional implementation activities.
• Maintain detailed technical documentation, procedures, and architectural records.
• Conduct security assessments and implement infrastructure security best practices.
• Participate in incident management and provide on-call support when required.
• Keep updated with emerging technologies and recommend infrastructure improvements.

Mandatory Requirements

• Strong hands-on experience in Windows Server / Wintel administration.
• Strong hands-on experience with Red Hat Enterprise Linux (RHEL).
• 3-5 years of experience in IT infrastructure administration, operations, or support.
• ITIL Foundation certification.
• Excellent written and verbal communication.
• Strong team coordination and collaboration skills.
• Good stakeholder presentation skills.
• Strong time management and prioritisation skills.
• Proven ability to prepare accurate and detailed technical documentation.
• Diploma/Degree in Computer Science, IT, Computer Engineering, or related field.

Good to Have

• IBM AIX administration.
• IBM Spectrum Protect for backup and recovery.
• CyberArk / Privileged Access Management.
• IBM QRadar / SIEM.
• Symantec EDR.
• IBM Tivoli Monitoring.
• RSA security solutions.
• Vulnerability remediation tracking and management.