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Salary
$66k – $84k per year (gross)
Location
In office (Singapore)
Seniority
Staff · 8+ years exp
Employment
Full-Time

First seen by Alion on Sep 28, 2026.

Overview
Company
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About Us Learn more about the company and the team behind it. Our History Our Team History of Henderson Security To-date we have successfully delivered a comprehensive array of services to a diverse customer base, making us an entrusted brand name in the local security industry.

Responsibilities:

  • Manage and maintain Windows Server infrastructure supporting business and security operations.

  • Administer Active Directory, DNS, DHCP, Group Policy, ADFS, Certificate Services and file services.

  • Monitor the availability, performance and capacity of servers, systems and infrastructure.

  • Manage VMware virtual infrastructure, including server provisioning, configuration, monitoring and troubleshooting.

  • Support Microsoft Azure, AWS and other cloud infrastructure platforms.

  • Provide technical support for IT systems and infrastructure supporting security operations and business functions.

  • Troubleshoot server, system, network and infrastructure-related issues and conduct root cause analysis.

  • Manage server patching, security updates, antivirus and other infrastructure security requirements.

  • Support IT infrastructure for security-related systems, operational applications and business-critical services.

  • Participate in infrastructure implementation, migration, upgrade and system enhancement projects.

  • Work with internal teams, vendors and service providers to maintain reliable connectivity and availability of IT systems.

  • Manage IT incidents, problems and changes in accordance with established IT service management procedures.

  • Prepare and maintain technical documentation, implementation plans, system procedures and operational reports.

  • Maintain accurate infrastructure and configuration records.

  • Support IT security, compliance, audit and business continuity requirements.

  • Provide technical assistance and guidance to IT support staff and users.

  • Participate in scheduled maintenance, system upgrades and on-call support when required.

Requirements:

  • Diploma or Degree in Information Technology, Computer Science, Computer Engineering, Information Systems or a related discipline.

  • Minimum 8 years of relevant experience in IT infrastructure, systems administration or a related field.

  • Strong hands-on experience in Microsoft Windows Server and Active Directory administration.

  • Good knowledge of DNS, DHCP, Group Policy, ADFS and Certificate Services.

  • Practical experience with VMware or other enterprise virtualization technologies.

  • Experience supporting Microsoft Azure, AWS or OCI.

  • Knowledge of IT infrastructure security, patch management, system monitoring and troubleshooting.

  • Good understanding of IT service management and ITIL processes.

  • Experience supporting infrastructure implementation, migration and upgrade projects.

  • Strong analytical, troubleshooting and problem-solving skills.

  • Good communication and interpersonal skills.

  • Ability to work independently and collaborate with technical, operational and business teams.

  • Experience supporting business-critical or security-related systems will be an advantage.

  • Microsoft Azure or AWS certification is preferred.

  • VMware certification is preferred.

  • ITIL certification will be an advantage.

Skills

infrastructure issues, Server Architecture, Microsoft Azure, support of IT systems, AWS, Security Requirements, Microsoft Windows Server Administration, ADFS, Infrastructure Migrations, Itil Service Management, Computer Science, Monitoring, Certificate Management, Cloud Infrastructure, Virtualization Technology, Infrastructure Security

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