About this role
Salary: £50,000 - 60,000 per year
Requirements: Proven experience in systems administration, infrastructure engineering or a similar technical role, with the ability to work autonomously and take ownership of complex challengesStrong Microsoft 365 administration and optimisation skillsExperience with Microsoft Entra ID, including SSO, Conditional Access, Identity Governance and Zero Trust principlesExperience with corporate networking, including firewalls, switching, wireless, VPN, DNS and DHCPExperience managing Windows, Linux and mobile devices, including endpoint management and secure configurationPowerShell or similar scripting skills to automate tasks and improve efficiencyExperience with cloud services, SaaS applications, collaboration tools and development-support servicesKnowledge of IT security, vulnerability management, patching, monitoring, backups and disaster recoveryExperience with incident management, root-cause analysis and security incident response, ideally involving SIEM toolsExperience with IT service management covering incidents, problems, changes and assetsStrong troubleshooting, risk assessment, prioritisation and communication skillsExperience guiding colleagues, maintaining technical documentation and working with suppliersEligibility for DV clearance is requiredDesirable: experience with Intune, Landscape, JumpCloud, Atlassian or similar tools; ITIL Foundation; Infrastructure as Code; AWS or Azure; ISO 27001; Cyber Essentials Plus; UK public-sector work; agile delivery; or developing IT policies and standards Responsibilities: Manage the performance, resilience and lifecycle of our cloud services, infrastructure, devices and applicationsAdminister Microsoft 365, Entra ID, identity and access management, endpoint security and corporate SaaS applicationsMaintain our corporate networks, including firewalls, switches, wireless, VPN, DNS and DHCPImplement configuration changes, integrations and automation to improve efficiency and consistencyMonitor service health, capacity, performance and security, and proactively address risks and vulnerabilitiesLead complex incident resolution, root-cause analysis and security investigationsCoordinate patching, upgrades, backups, recovery testing and business continuity arrangementsMaintain technical documentation, operational procedures, asset records and IT service-management standardsMentor colleagues, work with suppliers and stakeholders, and recommend improvements to support our future priorities Technologies: AWSAtlassianAzureCloudIncident ManagementSupportITILLinuxMicrosoft 365MobilePowerShellSecurityVPNWindowsOffice 365 More:
We are TwinStream, founded in 2019 by engineers solving complex challenges within government organisations. We combine deep technical expertise with outstanding client service and have grown to more than 100 people across the UK, working on-site, remotely and in hybrid environments. We are looking for a Senior IT Systems Administrator to take senior operational responsibility for our corporate IT estate, working alongside our IT Technical Lead to keep systems secure, reliable and fit for the future. This hands-on role is based in Bristol, with three days on-site, and offers a salary of £50,000–£60,000. We offer 28 days holiday plus bank holidays, the option to buy or sell an additional week, an annual bonus, an 8% non-contributory pension, private healthcare, critical illness cover, life insurance, enhanced parental leave, flexible working, learning and career progression opportunities, a supportive and inclusive team, and the opportunity to work on meaningful projects.
last updated 41 week of 2026