Jr. System Administrator

Astreya; Greater London; Hybrid; GBP 28,000 - 40,000; Full time

Job summary

Astreya in London is seeking a Jr. System Administrator to support and maintain large-scale building management and physical security systems. You will work ticket-based, handling incidents and requests under guidance, ensuring reliable operation.

Ideal candidates have a bachelor’s degree and 2–5 years of related experience, strong networking knowledge, and good communication. The role includes on-call support, after-hours work, and collaboration with internal and third-party teams.

Qualifications

• Bachelor’s degree with 2–5 years’ related experience or equivalent
• Builds productive internal and external working relationships
• Exercises judgment within defined procedures and practices
• Comfortable with building and managing various servers
• Experience with networking management, configurations and changes
• Experience with systems and networking troubleshooting to identify root causes and fixes
• Knowledgeable about ticket systems and follow processes
• Good communication and writing skills
• Automation and scripting experience (preferred)

Responsibilities

• Monitor ticket queue and IM channels
• Manage systems and infrastructure
• Record metadata related to tickets in internal tools (CTI, outage resolution time, transcripts)
• Resolve troubleshooting tickets from internal and third‑party teams
• Maintain professional vendor communications per code of conduct
• Provide out‑of‑hours support for scheduled upgrades
• Provide 24/7 on‑call support for critical outages
• Other duties as required

Skills

System administration

Networking management

Ticketing systems

Troubleshooting

Communication skills

Education

Bachelor’s degree in related field

Tools

CTI

Internal ticketing tools

Job description

## Jr. System AdministratorApply: London, United Kingdom: Full time: Posted Today: End Date: September 23, 2026 (8 days left to apply): R0017342****What this Job Entails:****The System Administrator is expected to facilitate operational support to and on behalf of the assigned team. The assigned team supports and maintains a variety of large and global scale systems for building management and physical security operations. The skill set required is industry typical 'systems administration', including working knowledge of various networking systems. Work is ticket based, and the team would be expected to procedurally work through tickets (submitted via a template) to resolution. ****Scope:***** Applies company policies and procedures to resolve a variety of issues* Works on problems of moderate scope* Receives general instructions on routine work and detailed instructions on new projects****Your Roles and 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, but not limited to, 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****Required Qualifications/Skills:***** Bachelor’s degree (B.S/B.A) from four-college or university and 2 to 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****Preferred Qualifications:***** Automation and scripting experience****Physical Demand & Work Environment:***** Must have the ability to perform office-related tasks which may include prolonged sitting or standing* Must have the ability to move from place to place within an office environment* Must be able to use a computer* Must have the ability to communicate effectively* Some positions may require occasional repetitive motion or movements of the wrists, hands, and/or fingers