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
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Take ownership of the design, operation, and optimisation of a large-scale VMware virtualisation platform, with a strong focus on VMware NSX
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Maintain and improve Linux-based systems across virtual and physical environments
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Troubleshoot complex infrastructure issues spanning virtualisation, systems, and networking
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Contribute to architectural decisions and continuous improvement initiatives
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Support major infrastructure projects and platform upgrades
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Participate in documentation, knowledge sharing, and change management processes
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Be part of an on-call rota (approx. 1 week every 2 months, with allowance)
Technical Environment
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Virtualisation: VMware NSX (critical)
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OS: Linux (Ubuntu, Debian, CentOS)
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Networking: Data centre networking, VXLAN, BGP
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Infrastructure: On-prem data centres with some cloud exposure
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Automation: Ansible, Terraform, Git
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Containerisation: Docker / Kubernetes (nice to have)
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Monitoring & Logging: Elastic stack and related tools
Essential Experience
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Strong, hands-on experience with VMware infrastructure, specifically NSX
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Solid Linux system administration background
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Good understanding of data centre networking concepts
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Experience working with firewalls and load balancers
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Comfortable working in a collaborative, technical team environment
Nice to Have
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Containerisation experience (Docker / Kubernetes)
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Cloud exposure (AWS or Azure)
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Strong VMware experience with slightly lighter Linux background also considered
Working Arrangements & Benefits
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Hybrid working - minimum 2 days onsite per week
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Strong work/life balance with limited out-of-hours work (planned in advance)
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Occasional travel to Dublin-based data centres
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On-call allowance
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Strong focus on wellbeing, flexibility, and professional development
