Senior System Engineer

Job Overview

We are seeking an experienced Senior System Engineer to join our infrastructure operations team, responsible for the administration, maintenance, support, and continuous improvement of enterprise Windows server environments. The successful candidate will have strong hands-on expertise in Microsoft Windows Server, Active Directory, PowerShell scripting, server patching, infrastructure monitoring, and enterprise system management tools.

The role operates within a highly structured, SLA-driven and ITIL-aligned environment, requiring the candidate to manage complex infrastructure incidents, perform root cause analysis, implement system improvements, and ensure the availability, security, and performance of critical enterprise systems.

Key Responsibility: 

Windows Server & Infrastructure Administration

• Perform advanced administration, configuration, troubleshooting, and maintenance of Microsoft Windows Server 2012/2016/2019 environments.

• Manage enterprise Windows server infrastructure including server builds, configuration, upgrades, performance tuning, and lifecycle management.

• Monitor server availability, performance, capacity, and system health to ensure compliance with operational and availability requirements.

• Diagnose and resolve complex Windows operating system, hardware, system services, and infrastructure-related incidents.

• Perform system health checks and proactively identify potential infrastructure issues before they impact business operations.

• Support physical and virtual server environments, including hardware components, storage, system resources, and server dependencies.

• Participate in infrastructure upgrades, technology refresh, server migration, consolidation, and decommissioning activities.

Active Directory & Identity Management

• Provide advanced administration and operational support for Microsoft Active Directory environments.

• Manage and troubleshoot Active Directory components including users, groups, computers, Organizational Units (OUs), Group Policy Objects (GPOs), authentication, permissions, and domain services.

• Perform investigation and resolution of complex AD-related issues involving authentication, access, replication, policies, and domain connectivity.

• Support Active Directory security and administration best practices, including access control and privileged account management.

• Assist with AD restructuring, domain migrations, policy changes, and infrastructure enhancement initiatives.

• Identify opportunities to automate repetitive Active Directory administration and operational tasks.

PowerShell & Automation

• Develop and maintain PowerShell scripts to automate system administration, monitoring, reporting, configuration, maintenance, and operational activities.

• Automate repetitive Windows Server and Active Directory tasks to improve operational efficiency and reduce manual intervention.

• Develop scripts for server health checks, user/account administration, system information gathering, patch validation, service monitoring, and operational reporting.

• Troubleshoot and enhance existing automation scripts while ensuring appropriate error handling, logging, and operational controls.

• Identify opportunities to introduce automation and standardisation into infrastructure support processes.

Server Patching & Security

• Plan, coordinate, and execute Windows Server patching activities in accordance with security requirements, change management procedures, and agreed maintenance windows.

• Perform pre- and post-patch validation to ensure system stability and application availability.

• Investigate patch-related issues and coordinate remediation with relevant infrastructure and application teams.

• Maintain patch compliance and provide accurate operational reporting.

• Support vulnerability remediation and infrastructure hardening activities where required.

• Ensure infrastructure changes are implemented in accordance with approved change management and security procedures.

Server Management & Monitoring Tools

• Administer and utilise enterprise server management, monitoring, deployment, and remote administration tools.

• Monitor infrastructure alerts and events, perform initial investigation, and take appropriate corrective actions.

• Support deployment and configuration management activities across Windows server environments.

• Maintain accurate system configuration information, operational records, and infrastructure documentation.

• Where applicable, utilise Altiris and other enterprise management tools for software deployment, configuration, inventory, patching, and endpoint/server management.

Storage & Hardware Infrastructure

• Demonstrate working knowledge of enterprise server storage technologies and RAID configurations, including RAID 0+1, RAID 1, RAID 5 and other commonly used RAID technologies.

• Troubleshoot server hardware, storage, disk, and RAID-related issues.

• Perform basic analysis of storage performance, capacity, disk health, and redundancy.

• Work with hardware and infrastructure vendors for complex hardware and storage-related incidents.

• Support hardware replacement, server maintenance, and infrastructure refresh activities.

Incident, Problem & Service Management

• Provide Level 2/Level 3 technical support for complex Windows infrastructure and Active Directory incidents.

• Manage incidents in accordance with defined Service Level Agreements (SLAs) and operational priorities.

• Perform detailed troubleshooting, root cause analysis, and problem resolution for recurring or high-impact infrastructure issues.

• Participate in major incident resolution and provide timely technical updates to relevant stakeholders.

• Maintain accurate incident, problem, change, and knowledge records within enterprise ticketing systems such as HP Service Manager / ServiceNow or equivalent platforms.

• Ensure incidents are properly documented, tracked, escalated, and resolved within agreed service levels.

• Participate in problem management activities and recommend preventive measures to minimise recurring incidents.

Change & Release Management

• Implement infrastructure changes in accordance with established ITIL and change management processes.

• Prepare technical implementation plans, risk assessments, rollback plans, and validation procedures for infrastructure changes.

• Support scheduled maintenance activities and planned service outages.

• Ensure all changes are appropriately documented and approved before implementation.

• Participate in post-implementation reviews and contribute to continuous improvement of change processes.

Operational Support & Shift Operations

• Provide infrastructure support within a 24x7 / shift-based operational environment, where required.

• Perform monitoring, incident response, scheduled maintenance, system checks, and operational activities during assigned shifts.

• Participate in on-call or after-hours support arrangements where applicable.

• Ensure effective handover of outstanding incidents, operational issues, and planned activities between shifts.

• Respond effectively to changing priorities and operational requirements in a dynamic technology environment.

Documentation & Continuous Improvement

• Develop and maintain technical documentation including operational procedures, troubleshooting guides, system runbooks, knowledge articles, and infrastructure documentation.

• Identify opportunities to improve infrastructure reliability, operational efficiency, automation, and service quality.

• Contribute to the development and improvement of standard operating procedures and technical support processes.

• Share technical knowledge and provide guidance to junior engineers and other support teams where required.

• Maintain awareness of current Windows infrastructure technologies, security practices, automation techniques, and operational best practices.

Requirements
Diploma/Degree in Computer Science, Information Technology, Computer Engineering, or a related discipline.

Minimum 5–8 years of hands-on experience in Windows Server / Infrastructure Administration, preferably within an enterprise environment.

Strong hands-on experience with Microsoft Windows Server 2012, 2016 and/or 2019.

Strong knowledge and practical experience in Microsoft Active Directory administration and troubleshooting.

Good understanding of Group Policy, DNS, DHCP, authentication, permissions, domain services, and Windows infrastructure dependencies.

Strong PowerShell scripting skills with experience in infrastructure automation.

Hands-on experience with Windows Server patching, maintenance, upgrades, and troubleshooting.

Experience working with enterprise server management, monitoring, deployment, and configuration management tools.

Knowledge of RAID technologies, including RAID 0+1, RAID 1, RAID 5 and other storage configurations.

Experience with Altiris and/or similar enterprise management tools will be advantageous.

Experience with enterprise ticketing and IT service management tools, such as HP Service Manager, ServiceNow, or equivalent.

Good understanding and awareness of ITIL processes, particularly Incident, Problem, Change, Request and Service Management.

Experience working in an SLA-driven IT operations environment with defined response and resolution targets.

Strong troubleshooting, analytical, and problem-solving skills.

Experience supporting enterprise infrastructure in a highly controlled and security-conscious environment will be an advantage.

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PERSOL Tech Services Pte Ltd

UEN No. 202233837K

Skills

infrastructure issues, Group Policies, Server Virtualization, Troubleshooting Operating System, Active Directory, Microsoft Windows Server Administration, Health and Safety Requirements, Computer Science, Windows Server, Infrastructure Automation, Authentication, new technologies, Server Management, Server Maintenance, Infrastructure Management, Maintenance and Repair