Senior Sys Admin – Windows, Hyper-V & SQL

ThreatLocker; Dublin; On-site; EUR 60,000 - 90,000; Full time

Job summary

ThreatLocker in Dublin, Ireland seeks an experienced Systems Administrator to join our IT Infrastructure team. This in‑office role maintains, secures, and improves internal systems, with emphasis on Windows Server, Hyper‑V, SQL Server, Active Directory, and network infrastructure.

You will support global IT projects, configure security best practices, and help ensure high availability and scalability. On-call duties may be required.

Qualifications

• Minimum 3 years' experience as a Systems Administrator or Systems Engineer.
• Extensive experience administering Microsoft Windows Server.
• Strong knowledge of Active Directory, Group Policy, DNS, DHCP, and Windows networking.
• Extensive experience with Microsoft Hyper-V.
• Strong experience administering Microsoft SQL Server.
• Experience managing enterprise networking equipment, including switches, firewalls, VPNs, VLANs, and routing.
• Strong understanding of storage technologies, backup solutions, and disaster recovery.
• Experience troubleshooting complex server and infrastructure issues.
• Excellent problem-solving and analytical skills.
• Ability to create and maintain technical documentation.

Responsibilities

• Administering and maintaining Windows Server environments.
• Managing Active Directory, Group Policy, DNS, DHCP, and related Microsoft infrastructure services.
• Administering and maintaining Hyper-V virtualization infrastructure.
• Installing, configuring, maintaining, and troubleshooting Microsoft SQL Server environments.
• Managing enterprise storage, backup, and disaster recovery solutions.
• Monitoring infrastructure performance, availability, and capacity.
• Installing, configuring, and maintaining network infrastructure, including switches, firewalls, wireless networks, VLANs, VPNs, and routing.
• Troubleshooting server, storage, networking, virtualization, and operating system issues.
• Planning and implementing infrastructure upgrades and system improvements.
• Applying operating system updates, firmware updates, and security patches.
• Implementing and maintaining cybersecurity best practices across the server and network environment.
• Creating and maintaining technical documentation, network diagrams, and standard operating procedures.
• Supporting office infrastructure and assisting with IT projects across multiple international locations.
• Working closely with internal engineering, development, and security teams to ensure reliable and secure infrastructure.
• Learn ThreatLocker products fully.
• On-call / After hour calls required.

Skills

Windows Server

Active Directory

Group Policy

DNS

DHCP

Hyper-V

SQL Server

Networking

Documentation

Problem-solving

Tools

PowerShell

Docker

Kubernetes

Azure

AWS

Terraform

Ansible

Job description

ThreatLocker in Dublin, Ireland seeks an experienced Systems Administrator to join our IT Infrastructure team. This in‑office role maintains, secures, and improves internal systems, with emphasis on Windows Server, Hyper‑V, SQL Server, Active Directory, and network infrastructure.

You will support global IT projects, configure security best practices, and help ensure high availability and scalability. On-call duties may be required.