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