Systems Administrator – 24/7 On-Call Global IT Ops

Astreya; Greater London; On-site; GBP 42,000 - 64,000; Full time

Job summary

Astreya is seeking a System Administrator to support and maintain large global-scale systems for building management and physical security operations. The role focuses on ticket-based work, procedural resolution, and collaboration with internal and third-party teams.

The successful candidate will manage servers, handle networking configurations, and document all ticket metadata. SSH/RDP access is used for remote work; Horizon/Citrix VDI experience is a plus.

Qualifications

• Bachelor's degree (B.S./B.A.) and 2–5 years’ related experience and/or training; or equivalent combination of education and experience
• Builds productive internal and external working relationships
• Exercises judgment within defined procedures and practices to determine appropriate action
• Comfortable with building and managing various servers
• Experience with networking management, configurations and changes
• Experience with systems and networking troubleshooting to identify the root cause and fixes
• Knowledgeable about ticket systems and follow processes
• Good communication and writing skills
• Windows Server Hybrid admin certification (AZ-800 and AZ-801) is a huge plus
• WindowsOS VM, Linux experience is a plus
• Focus on projects, experience patching Linux & Windows
• Remote via SSH, RDP
• JAMF not needed
• VDI is big plus (Horizon, Citrix) Virtual Desktop infrastructure
• Linux Cert is a plus

Responsibilities

• Monitor ticket queue and IM channels
• Monitor and participate in managing systems and infrastructure
• Accurately record all metadata related to tickets on internal tools, including CTI (category, type and item), outage resolution time, IM transcripts, postmortems, etc.
• Engage in managing and resolving troubleshooting tickets from internal teams and third-party teams, engaging other teams as necessary
• Maintain contact with 3rd parties and help to represent the assigned team in a professional and courteous manner which complies with clients’ vendor code of conduct
• Provide out of business hours support for any scheduled time sensitive upgrades
• Provide 24/7 on-call support for critical system’s outages
• Other duties as required. This list is not meant to be a comprehensive inventory of all responsibilities assigned to this position

Skills

Server management

Networking troubleshooting

Ticketing systems

Windows Admin

Linux Admin

SSH

RDP

VMware Horizon/Citrix

Communication

Documentation

Education

Bachelor's degree

Job description

Astreya is seeking a System Administrator to support and maintain large global-scale systems for building management and physical security operations. The role focuses on ticket-based work, procedural resolution, and collaboration with internal and third-party teams.

The successful candidate will manage servers, handle networking configurations, and document all ticket metadata. SSH/RDP access is used for remote work; Horizon/Citrix VDI experience is a plus.