3rd Line / Systems Administrator - Oscar Technology : Job Details

Salary:

£40,000 - £45,000 DOE + On-Call Allowance + Bonus + Benefits

About the Role:

We're looking for a Third Line Systems Administrator to join a dynamic managed hosting provider, acting as the final point of escalation for complex infrastructure issues. You'll play a key part in improving, automating, and optimising core systems - making a genuine impact in a business that values technical ownership and continuous evolution.

This is a hands-on, senior-level role suited to engineers with strong experience in Linux, VMware, Cisco, and infrastructure automation, ideally in a managed services or hosting environment.

Key Responsibilities:

• Serve as the final escalation point for critical infrastructure incidents and issues
• Administer and maintain Linux systems (RedHat, CentOS, Ubuntu)
• Manage virtualisation environments (VMware vSphere, ESXi, vCenter)
• Support and configure Cisco network infrastructure (routing, switching, firewalls)
• Drive improvements through automation (Bash, Python, Ansible, Puppet)
• Lead infrastructure upgrade and optimisation projects
• Work closely with internal teams and clients to ensure uptime and performance
• Contribute to disaster recovery planning, monitoring, and best practice documentation
• Participate in an on-call rota

What We're Looking For:

• Proven 3rd line / senior systems admin experience in a hosting or MSP setting
• Deep understanding of Linux server administration
• Strong VMware virtualisation skills
• Cisco networking knowledge (ideally CCNA or equivalent)
• Experience automating infrastructure with scripting or config management tools
• Ability to take ownership, troubleshoot end-to-end, and drive real change

Desirable Extras:

• Public cloud experience (AWS, Azure, OpenStack)
• Storage (SAN/NAS) and backup tools (Veeam, Rubrik)
• Monitoring platforms (Zabbix, PRTG, Nagios)

Why Join?

• Be the go-to technical expert in a close-knit, high-performing team
• Improve real-world systems, not just maintain them
• Clear progression opportunities into architecture or DevOps pathways
• Flexible hybrid working and supportive leadership
• Funded certifications and a strong focus on your technical development

Apply today to become the engineer that makes a real difference or reach out for a confidential chat.

Oscar Associates (UK) Limited is acting as an Employment Agency in relation to this vacancy.

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