Senior IT Specialist

AMOS INTERNATIONAL (S) PTE LTD; Singapore; On-site; SGD 80,000 - 100,000; Full time

Job summary

A leading tech firm in Singapore is seeking an experienced IT Infrastructure Manager to design and manage core infrastructure systems, lead cybersecurity initiatives, and provide high-level support for end-user issues. The ideal candidate holds a degree in IT or related fields, possesses over 5 years of experience in infrastructure administration, and has a strong knowledge of VMware and cloud platforms. This position offers an opportunity to take on challenges and improve system efficiency in a dynamic environment.

Qualifications

• 5+ years of progressive experience in IT infrastructure administration with at least 3+ years focused on cybersecurity.
• 3+ years of hands-on experience deploying and managing enterprise VMware vSphere environments.
• Proven experience with incident response and security tooling.

Responsibilities

• Design, implement, and manage core infrastructure systems.
• Serve as the technical lead for cybersecurity initiatives.
• Act as the ultimate escalation point for end-user technical issues.

Skills

VMware vSphere Suite

Cloud platforms (Azure)

Networking (TCP/IP, VLANs, VPN, firewalls)

Scripting for automation (PowerShell/Python)

Incident response and security tooling

Customer service

Education

Bachelor’s degree in Computer Science, Information Technology, Cybersecurity

Tools

SIEM

Microsoft Intune

Freshdesk

Job description

Infrastructure Management (20%)

• Design, implement, and manage core infrastructure systems: servers (physical/virtual/cloud), storage (SAN/NAS), network (LAN/WAN/WLAN, firewalls, switches, routers), and data center operations.
• Administer and optimize our VMware vSphere/ESXi environment, including vCenter, vMotion, DRS, HA, and resource management.
• Lead server lifecycle management: provisioning, patching, performance tuning, and decommissioning of physical and virtual servers.
• Lead cloud infrastructure (Azure) strategy, including migration, optimization, and cost management (FinOps).
• Oversee enterprise identity and access management (IAM) platforms (e.g., Active Directory & Azure AD).
• Develop and maintain disaster recovery (DR) and business continuity (BCP) plans, including VMware Site Recovery Manager (SRM) or equivalent replication strategies.
• Automate repetitive tasks and improve system efficiency using scripting (PowerShell, Python, etc.) and infrastructure-as-code (IaC) tools.
• Monitor system performance, capacity, and availability; proactively resolve issues and plan for future growth.
• Manage vendor relationships and evaluate new technologies.

Security Operations & Governance (40%)

• Serve as the technical lead for cybersecurity initiatives, acting as a subject matter expert.
• Implement, manage, and monitor security tools: SIEM, EDR/XDR, vulnerability scanners, intrusion detection/prevention systems (IDS/IPS), and email security gateways.
• Harden VMware infrastructure components per security best practices (vCenter, ESXi hosts, VM templates).
• Conduct regular vulnerability assessments and own the remediation process across the physical and virtual server estate.
• Develop, enforce, and educate staff on IT security policies, standards, and procedures.
• Lead incident response activities: detection, analysis, containment, eradication, recovery, and post-mortem reporting.
• Ensure compliance with relevant regulations and frameworks (e.g., ISO 27001, NIST, GDPR as applicable).
• Manage endpoint security, patch management, and configuration hardening across all devices using Microsoft Intune.

End-User Support & Expertise (40%)

• Act as the ultimate escalation point for the IT helpdesk, resolving all end-user technical issues.
• Diagnose and resolve deep-rooted problems related to network connectivity, application performance, authentication, permissions, mobility, and hardware/software conflicts.
• Create knowledge base articles, runbooks, and training to improve first-call resolution.
• Provide direct, white-glove support and troubleshooting for executive staff and business-critical functions during major incidents or for sensitive requests.
• Analyze support ticket (Freshdesk) trends to identify underlying infrastructure or security problems and initiate proactive projects to eliminate recurring issues.
• Standby for critical after-hours infrastructure and security incidents.

Qualifications & Skills Required

• Bachelor’s degree in Computer Science, Information Technology, Cybersecurity, or related field, or equivalent practical experience.
• 5+ years of progressive experience in IT infrastructure administration with at least 3+ years focused on cybersecurity.
• 3+ years of hands‑on experience deploying, and managing enterprise VMware vSphere environments.

Hands‑on expertise in

1. VMware vSphere Suite (vCenter, ESXi, vMotion, HA, DRS).
2. Virtual server performance monitoring, capacity planning, and troubleshooting.
3. Networking (TCP/IP, VLANs, VPN, firewalls).
4. Windows/Linux server administration and enterprise Active Directory.
5. Cloud platforms (Azure).
6. Core security principles and tooling.
7. Scripting for automation (PowerShell/Python).

• Proven experience with incident response, vulnerability management, and security tooling.
• Exceptional customer service, patience, and communication skills, with the ability to explain complex technical concepts to users of all skill levels.
• Expert‑level troubleshooting methodology and analytical skills.