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# Senior IT Systems Administrator

- **Company:** Twinstream Limited
- **Location:** Gloucester, UK
- **Experience:** Expert
- **Salary:** £50,000.0 - £60,000.0
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Amazon Web Services, Microsoft Azure, Backup Devices, Software as a Service, Collaborative Software, Cyber Security, Dynamic Host Configuration Protocol, Linux, Disaster Recovery, Identity and Access Management, Virtual Private Networks (VPN), Windows PowerShell, Azure Active Directory, Cloud Services, Zero Trust Network Access, Security Information and Event Management, Single Sign-On, Systems Integration, Software Vulnerability Management, Scripting, Software Troubleshooting, Firewalls (Computer Science), Microsoft InTune, Information Technology, Atlassian Tools
- **Published:** October 11, 2026
- **Apply:** https://find.jobs/jobs-near-me/apply/ats-redirect/?id=3014006969-2

## About the Role

You'll bring proven experience in systems administration, infrastructure engineering or a similar technical role, alongside the confidence to work autonomously and take ownership of complex challenges., * Strong Microsoft 365 administration and optimisation skills.

 * Microsoft Entra ID, including SSO, Conditional Access, Identity Governance and Zero Trust principles.
 * Corporate networking, including firewalls, switching, wireless, VPN, DNS and DHCP.
 * Managing Windows, Linux and mobile devices, including endpoint management and secure configuration.
 * PowerShell or similar scripting tools to automate tasks and improve efficiency.
 * Cloud services, SaaS applications, collaboration tools and development-support services.
 * IT security, vulnerability management, patching, monitoring, backups and disaster recovery.
 * Incident management, root-cause analysis and security incident response, ideally involving SIEM tools.
 * IT service management covering incidents, problems, changes and assets.
 * Strong troubleshooting, risk assessment, prioritisation and communication skills.
 * Experience guiding colleagues, maintaining technical documentation and working with suppliers.

Desirable: Intune, Landscape, JumpCloud, Atlassian or similar tools; ITIL Foundation; Infrastructure as Code; AWS or Azure; ISO 27001; Cyber Essentials Plus; UK public-sector experience; and involvement in agile delivery or developing IT policies and standards.

You don't need to meet every requirement. If you have strong technical foundations and a proactive approach to improving IT services, we'd love to hear from you.

## Description

You'll take senior operational responsibility for TwinStream's corporate IT estate, ensuring systems remain secure, reliable and fit for the future. Working alongside the IT Technical Lead, you'll turn technical priorities into practical improvements while using your expertise to resolve issues, guide colleagues and enhance service delivery.

Your responsibilities will include:

 * Managing the performance, resilience and lifecycle of cloud services, infrastructure, devices and applications.
 * Administering Microsoft 365, Entra ID, identity and access management, endpoint security and corporate SaaS applications.
 * Maintaining corporate networks, including firewalls, switches, wireless, VPN, DNS and DHCP.
 * Implementing configuration changes, integrations and automation to improve efficiency and consistency.
 * Monitoring service health, capacity, performance and security, proactively addressing risks and vulnerabilities.
 * Leading complex incident resolution, root-cause analysis and security investigations.
 * Coordinating patching, upgrades, backups, recovery testing and business continuity arrangements.
 * Maintaining technical documentation, operational procedures, asset records and IT service-management standards.
 * Mentoring colleagues, working with suppliers and stakeholders, and recommending improvements to support future priorities.