Senior Systems Administrator

My West Dublin based client is recruiting for a Senior Systems Administrator.

This is a permanent role with 2 days onsite.

The Senior Systems Administrator will manage, and improve IT infrastructure, ensuring high levels of availability, performance, and security.

The ideal candidate will bring expertise in operating systems, networking, cloud environments, and enterprise-level infrastructure management.

Job Responsibilities Systems Administration : Oversee and support on-premises and cloud-based systems.

Install, configure, and maintain hardware and software, including servers, storage, and networking components.

Ensure the stability, security, and performance of IT infrastructure across multiple platforms.

Monitoring & Performance Tuning : Continuously monitor system health, performance, and capacity.

Diagnose and troubleshoot issues to ensure optimal performance and availability.

Perform proactive patching and upgrades to minimise disruptions.

Security Management : Implement and maintain security policies and procedures to safeguard systems and data.

Address vulnerabilities and ensure systems comply with best practices and regulations.

Plan and coordinate upgrades to firewalls, VPNs, and other security tools.

Backup & Disaster Recovery : Manage backup strategies and disaster recovery plans.

Regularly test and refine recovery procedures to ensure data integrity and reliability.

Automation & Scripting : Develop scripts and automate administrative tasks using PowerShell or equivalent tools.

Collaboration & Support : Provide support for escalated issues from internal teams and external support providers.

Collaborate with developers, network administrators, and IT teams to optimise infrastructure.

Document system configurations, processes, and procedures for stakeholders.

Experience Required 5+ years of experience in a Senior Systems Administrator or equivalent role.

Expertise in Windows systems administration.

Strong knowledge of cloud platforms (AWS, Azure, GCP) and virtualisation technologies (VMware, Hyper-V).

Hands-on experience with networking (TCP / IP, DNS, DHCP, VLANs, etc.).

Proficiency in scripting and automation using PowerShell.

Experience with disaster recovery planning and execution.

Knowledge of cybersecurity best practices (firewalls, VPNs, IDS / IPS).

Ability to thrive in a hybrid work environment with excellent time management skills.

Strong problem-solving abilities to troubleshoot complex system issues.

Willingness to participate in an on-call rota.

Essential and Desirable Skills Experience with containerisation technologies such as Docker and Kubernetes.

Familiarity with monitoring tools like SCOM, Nagios, Zabbix, Prometheus, or Azure Monitor.

Educational Requirements Microsoft Server and Azure certifications are advantageous Working Hours & Benefits 2 Days Onsite / 3 days remote Pension Skills : Senior Systems Administrator Azure Vmware Networking Infrastructure Systems Administration PowerShell