IT Systems Administrator (Security-Focused), Dublin Pike

IT Systems Administrator (Security-Focused) Role Overview The IT Operations Systems Administrator is responsible for the design, build, support, and maintenance of complex, high-quality infrastructure solutions, with a strong focus on Microsoft technologies.

This role serves as the primary interface between the Cyber Security Project Team and the IT Operations function, ensuring that security-driven infrastructure initiatives are effectively designed and implemented.

The position plays a key role in delivering strategic security projects, enhancing the organisation's security posture, and ensuring alignment with infrastructure standards, operational requirements, and regulatory expectations.

Key Responsibilities Infrastructure&Security Leadership

Act as Technical Lead for cybersecurity projects delivering infrastructure-related security initiatives in a critical 24x7 operational environment

Design and implement scalable, resilient, and secure infrastructure solutions aligned with industry best practices

Lead the design and delivery of secure architecture aligned to business, regulatory, and operational requirements

Systems Administration&Operations

Perform daily, weekly, and periodic system administration tasks to maintain system health and performance

Manage vulnerability remediation and security patching across infrastructure environments

Monitor infrastructure and security performance to meet SLA requirements

Support high availability and disaster recovery strategies for critical systems

Design&Implementation

Design and build complex Microsoft-based infrastructure environments with a focus on security hardening

Implement failover strategies and conduct regular resilience testing

Collaborate with application teams to ensure performance, resilience, and secure traffic flows

Support&Continuous Improvement

Resolve escalated technical issues from first- and second-line support teams

Provide ongoing recommendations for process improvements and operational efficiencies

Mentor junior team members and contribute to team capability development

Documentation&Compliance

Produce and maintain high-quality technical documentation

Support internal and external audit requirements

Ensure compliance with ITIL or similar process control methodologies

Knowledge, Skills&Experience Experience

Minimum 5 years' senior-level experience working with Microsoft technologies in a large enterprise environment

Technical Skills

Strong expertise in Windows Server (2019/2022/2025) implementation and administration

Advanced knowledge of Active Directory and Group Policy

Solid understanding of network protocols and infrastructure concepts

Experience with backup solutions and principles (NetBackup desirable)

Strong knowledge of Windows 11 client environments

Desirable Skills

Experience with VMware or other virtualisation platforms

Knowledge of storage technologies

Linux administration experience (e.g., RedHat, Oracle Enterprise Linux)

Familiarity with automation tools (Python, Ansible, REST APIs)

Professional Skills

Strong analytical and problem-solving abilities

Ability to work independently and collaboratively within a team

Excellent communication skills across all levels of the organisation

Strong organisational, documentation, and administrative capabilities

Experience working in structured environments using ITIL or similar frameworks

Qualifications&Certifications Education

Third-level qualification in IT or equivalent practical experience

Certifications (Required/Preferred)

MCSA, MCP, and/or CCNA

CompTIA Security+

Microsoft Certified: Information Security Administrator Associate (with a focus on Microsoft 365)

Additional Information

This role operates within a critical 24x7 environment and may require participation in on-call or out-of-hours support

Strong emphasis on security, resilience, and continuous improvement across infrastructure services

#J-18808-Ljbffr