Systems Operation Engineer (Wintel & Active Directory)

RESORTS WORLD AT SENTOSA PTE. LTD.; Singapore; On-site; SGD 60,000 - 80,000; Full time

Job summary

A premier resort in Singapore is seeking a Systems Operations Engineer to ensure seamless operation of its IT infrastructure. This role emphasizes maintaining Windows, Linux, and cloud-based systems while implementing cutting-edge automation and monitoring solutions. A strong background in systems administration with a minimum of 5 years experience is essential, along with relevant certifications. The ideal candidate will also have a proven ability to work under pressure in a dynamic environment like a resort, ensuring the highest availability and optimizing IT service management.

Qualifications

• 5+ years experience in systems administration or SysOps, preferably in 24/7 operational environments.
• Knowledge of compliance requirements: PCI-DSS, GDPR, ISO/IEC 27001.

Responsibilities

• Maintain and optimize Windows, Linux, and cloud-based systems.
• Implement proactive monitoring to prevent downtime.
• Design, implement, and manage security of identity infrastructure.

Skills

Expertise in administering a multi-domain/multi-site AD environment

Hands-on experience with cloud infrastructure (AWS, Azure)

Strong knowledge of AD replication, topology, and domain controller management

Scripting ability in PowerShell, Bash, or Python

Good knowledge of Windows Server and Linux server

Clear written and verbal communication

Education

Certifications such as AWS SysOps Administrator or Microsoft Certified: Azure Administrator

At least 5 years experience in systems administration

Tools

SolarWinds

Ansible

Terraform

Microsoft DNS

Job description

Role Responsibilities

We are seeking a detail-oriented and technically skilled Systems Operations Engineer to join our IT team. The role is responsible for maintaining and optimizing Windows, Linux, and cloud-based systems that support critical resort operations. You’ll work across hybrid environments (on-premises and cloud), implement automation and monitoring tools, respond to incidents affecting guest services, and ensure high system availability for 24/7 resort operations. This role is key to ensuring delivery of uninterrupted, reliable systems and ICT infrastructure, contributing to IT division's goal of providing excellent IT service management.

System Operations & Maintenance

• Design, implementation, management and security of our core identity infrastructure, including Active Directory Domain Services, Microsoft DNS, Public Key Infrastructure (PKI), and the Microsoft Entra ID (Azure AD) ecosystem.
• Manage, monitor, and maintain Windows and Linux-based systems across hybrid environments (on-premises and cloud).

Cloud & Hybrid Infrastructure

• Operate and maintain cloud services (AWS, Azure) integrated with on-premise data centers.
• Support disaster recovery and high-availability configurations for critical hospitality and gaming systems.

Monitoring & Reliability

• Implement proactive monitoring using tools like SolarWinds, Datadog or Azure Monitor to prevent downtime in high-traffic systems.
• Quickly respond to incidents affecting guest services or operations and conduct thorough root cause analysis.
• Automation & Configuration Management using tools like Ansible, Terraform, or PowerShell to automate provisioning and configuration.
• Maintain configuration baselines for servers supporting hotel, casino, and resort services.

Security & Compliance

• Enforce security best practices across all systems in compliance with industry standards such as PCI-DSS (for gaming/payments) and GDPR (for guest data) including reviewing of hardening standards.
• Manage patching and endpoint security to protect infrastructure.

Collaboration & Documentation

• Work closely with IT, facilities, and service departments to align infrastructure with business needs.
• Maintain detailed documentation of systems, procedures, and service records.

Role Requirements

Required Qualifications

• At least 5 years experience in systems administration or SysOps, preferably in a 24/7 operational environment (hospitality, casino, or similar)
• Knowledge of compliance requirements: PCI-DSS, GDPR, ISO/IEC 27001
• Certifications such as AWS SysOps Administrator, Microsoft Certified: Azure Administrator, or CompTIA Security+ are advantageous.

Skills

• Expertise in administering a multi-domain/multi-site AD environment
• Expertise in designing, implementing, and troubleshooting Group Policy Objects (GPOs)
• Strong knowledge of AD replication, topology, and domain controller management
• Understanding of core AD security protocols (Kerberos, LDAP, NTLM)
• Hands‑on experience with Entra ID Connect for hybrid identity synchronization
• Practical knowledge of user and group management in cloud (Entra ID)
• Understanding of hybrid authentication methods (Password Hash Sync, Pass‑Through Authentication)
• Experience managing Microsoft DNS services integrated with Active Directory
• Ability to manage DNS records, zones, and troubleshoot name resolution issues
• Experience deploying and managing a two‑tier PKI (Public Key Infrastructure)
• Knowledge of certificate templates, auto‑enrollment, and CRL/OCSP management
• Basic understanding of networking concepts (Firewalls, Load Balancers) as they are related to authentication
• Good knowledge of Windows Server, Linux server, Windows Failover Clusters and network environments
• Hands‑on experience with cloud infrastructure (AWS, Azure)
• Familiarity with virtualization platforms (VMware, Hyper‑V) will be advantageous
• Scripting ability in PowerShell, Bash, or Python scripting for automation of AD and Entra ID tasks.
• Strong attention to detail and commitment to uptime
• Ability to perform under pressure, especially during major events or peak resort hours
• Clear written and verbal communication, able to work with technical and non‑technical teams