IT Infrastructure & Cybersecurity Lead (Hands-on)

cla se asia holdings pte. ltd.; Singapore; On-site; SGD 70,000 - 90,000; Full time

Job summary

cla se asia holdings pte. ltd. is seeking an experienced Assistant Manager, IT Infrastructure & Cybersecurity to strengthen our IT environment in Singapore.

You will manage core systems, improve security controls and contribute to infrastructure and cybersecurity projects. The role demands hands-on expertise with Active Directory, Windows Server, Microsoft 365 and certificate management, plus how to secure endpoints and patch systems.

Qualifications

• Degree or diploma in IT, cybersecurity, CS or related field.
• 6–10 years of relevant IT infra/cybersecurity experience.
• Hands-on with Active Directory, Windows Server, DNS/DHCP and MS 365.
• Experience with certificate management and security controls.

Responsibilities

• Manage and support AD, user access, Group Policy and MS 365.
• Administer Windows Server, DNS, DHCP, file services, backups.
• Manage SSL/TLS certificates and CA services.
• Coordinate cybersecurity updates, patching, endpoint security and hardening.
• Monitor servers for reliability, performance and security.
• Troubleshoot infrastructure, access, application and security issues.
• Maintain IT documentation and system records.
• Automate repetitive tasks with PowerShell or similar tools.
• Support IT infra, cybersecurity, audit and compliance projects.
• Provide guidance and escalation support to junior IT team members.

Skills

Leadership & mentoring

Troubleshooting & problem solving

Clear communication

Stakeholder management

Education

Diploma or Degree in Information Technology, Cybersecurity, Computer Science or related field

Tools

Active Directory

Group Policy

Windows Server

DNS

DHCP

Microsoft 365

Certificate Authority

SSL/TLS certificates

PowerShell

Endpoint security

Job description

cla se asia holdings pte. ltd. is seeking an experienced Assistant Manager, IT Infrastructure & Cybersecurity to strengthen our IT environment in Singapore.

You will manage core systems, improve security controls and contribute to infrastructure and cybersecurity projects. The role demands hands-on expertise with Active Directory, Windows Server, Microsoft 365 and certificate management, plus how to secure endpoints and patch systems.