Senior Systems Administrator

Senior Systems Administrator (Virtualisation)

Permanent | Dublin (Hybrid)

We are working with a well-established organisation seeking a Senior Systems Administrator with a strong background in virtualisation and Linux infrastructure to join a growing systems team.

This is a hands-on senior role with ownership of critical virtual infrastructure, working closely with other senior engineers and technical teams to ensure platform stability, scalability, and performance.

The Role

• Take ownership of the design, operation, and optimisation of a large-scale VMware virtualisation platform, with a strong focus on VMware NSX

• Maintain and improve Linux-based systems across virtual and physical environments

• Troubleshoot complex infrastructure issues spanning virtualisation, systems, and networking

• Contribute to architectural decisions and continuous improvement initiatives

• Support major infrastructure projects and platform upgrades

• Participate in documentation, knowledge sharing, and change management processes

• Be part of an on-call rota (approx. 1 week every 2 months, with allowance)

Technical Environment

• Virtualisation: VMware NSX (critical)

• OS: Linux (Ubuntu, Debian, CentOS)

• Networking: Data centre networking, VXLAN, BGP

• Infrastructure: On-prem data centres with some cloud exposure

• Automation: Ansible, Terraform, Git

• Containerisation: Docker / Kubernetes (nice to have)

• Monitoring & Logging: Elastic stack and related tools

Essential Experience

• Strong, hands-on experience with VMware infrastructure, specifically NSX

• Solid Linux system administration background

• Good understanding of data centre networking concepts

• Experience working with firewalls and load balancers

• Comfortable working in a collaborative, technical team environment

Nice to Have

• Containerisation experience (Docker / Kubernetes)

• Cloud exposure (AWS or Azure)

• Strong VMware experience with slightly lighter Linux background also considered

Working Arrangements & Benefits

• Hybrid working - minimum 2 days onsite per week

• Strong work/life balance with limited out-of-hours work (planned in advance)

• Occasional travel to Dublin-based data centres

• On-call allowance

• Strong focus on wellbeing, flexibility, and professional development