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Salary
£40,000 - £45,000 DOE + On-Call Allowance + Bonus + Benefits
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.
To understand more about what we do with your data please review our privacy policy in the privacy section of the Oscar website.
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Seniority level
* Seniority level
Mid-Senior level
Employment type
* Employment type
Full-time
Job function
* Job function
Information Technology
* Industries
Data Infrastructure and Analytics
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