Systems Operation Engineer (Wintel & Active Directory)

Resorts World at Sentosa Pte Ltd; Singapore; On-site; SGD 70,000 - 90,000; Full time

Job summary

A premium lifestyle destination resort in Singapore seeks a detail-oriented Systems Operations Engineer to maintain and optimize Windows, Linux, and cloud-based systems. Responsibilities include ensuring high system availability, managing identity infrastructure, and implementing monitoring tools. Ideal candidates will have 5+ years in a 24/7 operational environment and relevant certifications. Join a dynamic IT team to support the resort's essential operations.

Qualifications

• At least 5 years of experience in systems administration or SysOps in a 24/7 environment.
• Knowledge of PCI-DSS, GDPR, ISO/IEC 27001 compliance requirements.
• Certifications such as AWS SysOps Administrator or Azure Administrator are advantageous.

Responsibilities

• Maintain and optimize Windows, Linux, and cloud systems supporting resort operations.
• Design and manage core identity infrastructure including Active Directory and PKI.
• Implement monitoring and automation tools to ensure system availability.

Skills

Systems administration

Active Directory management

Cloud services (AWS, Azure)

Security compliance (PCI-DSS, GDPR)

PowerShell scripting

Incident response

Tools

SolarWinds

Datadog

Azure Monitor

Ansible

Terraform

Job description

Company Description

Resorts World Sentosa (RWS), Asia's premium lifestyle destination resort, is located on Singapore's resort island of Sentosa. Spanning 49 hectares, RWS is home to world‑class attractions including Universal Studios Singapore, S.E.A. Aquarium, Dolphin Island and Adventure Cove Waterpark. Complementing the adventure and adrenaline of its theme parks and attractions are eight unique luxury hotels, the world‑class Resorts World Convention Centre, and a casino. RWS offers award‑winning dining experiences and exciting cuisines from around the world across its many renowned celebrity chef restaurants, establishing itself as a key player in Singapore's vibrant and diverse dining scene and a leading gourmet destination in Asia for epicureans. The integrated resort also offers world‑class entertainment, from original resident productions to concerts. RWS has been named "Best Integrated Resort" since 2011 for ten consecutive years at the TTG Travel Awards which recognises the best of Asia‑Pacific's travel industry. RWS is wholly owned by Genting Singapore, a company of the Genting Group. For more information, please visit www.rwsentosa.com.

Job 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.

Job Requirements

Required Qualifications

• At least 5 of 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:

• Proven experience (3-5+ years) 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 for technical and non‑technical teams