{"id":2174472,"url":"https://alion.io/job/twinstream-senior-it-systems-administrator","title":"Senior IT Systems Administrator","company":{"id":689977,"name":"TwinStream","domain":"twinstream.com","url":"https://alion.io/company/twinstream","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":75,"open_postings":5,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":34,"computed_at":"2026-10-15T05:46:00Z"}},"role":"DevOps","role_family":"DevOps","seniority":"senior","employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Bristol, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":50000,"max":60000,"currency":"GBP","period":"year","gross":null,"usd_annual":79410},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"DHCP","optional":false},{"name":"DNS","optional":false},{"name":"Least Privilege","optional":false},{"name":"Linux","optional":false},{"name":"Microsoft Entra ID","optional":false},{"name":"PowerShell","optional":false},{"name":"SIEM","optional":false},{"name":"VPN","optional":false},{"name":"Windows","optional":false},{"name":"Zero Trust","optional":false},{"name":"Agile","optional":true},{"name":"AWS","optional":true},{"name":"Azure","optional":true},{"name":"ITIL","optional":true}],"status":"live","first_seen_at":"2026-10-09T12:53:33Z","employer_posted_date":"2026-10-12","last_verified_at":"2026-10-15T22:34:46Z","board_verified":true,"closed_at":null,"days_open":6,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":6},"description":"About Us \nIn 2019, the founders were working as engineers solving complex cross-domain problems within government organisations. \nTwinStream was formed to bring together their collective expertise and experience into a single business, focused on delivering technical excellence and high-quality service to clients. \nSince then, the company has grown to over 100 team members across the UK, with colleagues working both on-site with clients, hybrid and remotely from home. \nSalary: £50,000 - £60,000 \nLocation: Hybrid working, with 3 days a week onsite in Bristol.\nSecurity Clearance: Must be eligible for DV Clearance \nThe Role \nAs a Senior IT Systems Administrator, you’ll take senior operational responsibility for the performance, resilience, maintenance and continual improvement of TwinStream’s IT systems and services, helping ensure they remain secure, reliable and fit for purpose as the business grows. \nWorking within the strategy, architecture, standards and technical priorities set by the IT Technical Lead, you’ll translate agreed priorities into well-planned and sustainable improvements across the corporate IT estate. This is a hands-on senior role requiring sound technical judgement, leadership of complex technical implementation, resolution of high-impact issues and guidance for colleagues across the IT team. \nYou’ll operate autonomously within agreed technical guardrails and delegated authority, escalating significant architectural, strategic or cross-estate decisions to the IT Technical Lead. \nWhat You’ll Be Doing \nLeading the day-to-day management of the operational performance, resilience and lifecycle of cloud services, corporate infrastructure, end-user devices and applications. \nImplementing, maintaining and recommending improvements to operational standards for identity and access management, Joiner, Mover and Leaver processes, endpoint management and asset management. \nLeading the technical implementation of configuration changes, automation and system integrations in accordance with agreed architecture, standards and change priorities. \nAdministering and optimising cloud platforms, corporate SaaS applications, collaboration tools and development-support services, escalating material architecture, supplier or licensing decisions where required. \nProviding senior administration and operational assurance of the corporate network, including routers, switches, wireless services and associated network components. \nMonitoring service health, capacity, performance and security, identifying trends and taking proactive action to address risks before they affect users. \nActing as the senior operational escalation point for complex incidents and problems, coordinating resolution, root-cause analysis and preventative action, and escalating critical or systemic issues to the IT Technical Lead. \nPlanning and coordinating patching, vulnerability remediation and upgrades, balancing operational risk and business priorities within agreed technical and security requirements. \nImplementing, maintaining and testing backup, recovery and continuity arrangements in support of the disaster recovery approach defined by the IT Technical Lead. \nLeading technical investigation and escalation of security events and incidents in accordance with agreed procedures, ensuring corrective actions and lessons are followed through. \nMaintaining the quality of technical documentation, operational procedures, asset information and system records, ensuring they remain accurate and usable. \nMentoring colleagues, reviewing implementation approaches for alignment with agreed standards and promoting consistent, high-quality delivery. \nIdentifying and analysing operational and technical improvements, distinguishing between service requests, small works and larger changes, and producing options, effort estimates and recommendations for prioritisation. \nBuilding effective relationships with stakeholders, technical partners and suppliers to coordinate technical delivery and resolve operational issues. \nWhat We’re Looking For \nWe recognise that no one ticks every box. If your experience aligns with many of the requirements below, we’d love to hear from you. \nEssential Skills \nProven experience in systems administration, infrastructure engineering or a comparable hands-on technical role, with responsibility for complex services or technical delivery \nA strong track record of managing business-critical IT services, making sound technical recommendations, resolving complex issues and delivering continual improvement, including assessing demand, distinguishing between service requests, small works and larger projects, and undertaking analysis and estimation to support prioritisation \nStrong practical knowledge of Microsoft 365 administration, optimisation and adoption, with the ability to recommend and implement improvements \nStrong practical knowledge of identity and access management using Microsoft Entra ID, including SSO, Conditional Access and Identity Governance, with experience applying Zero Trust principles such as least privilege, explicit verification and continuous risk assessment \nPractical experience managing corporate networks, including firewalls, switching, wireless, VPN, DNS and DHCP, with strong network troubleshooting skills \nExperience using PowerShell or comparable scripting tools to automate administration, improve consistency and reduce manual effort \nStrong analytical and troubleshooting skills, with the ability to assess risk and communicate technical options and recommendations clearly to technical and non-technical stakeholders \nAble to work autonomously, prioritise competing demands, exercise sound judgement, mentor colleagues and provide technical guidance \nExperience managing end-user devices across Windows, Linux and mobile platforms, including endpoint management, secure configuration, vulnerability remediation and information-protection controls \nExperience administering and optimising corporate SaaS applications and collaboration or development-support tools \nExperience monitoring service health, capacity, performance and security, and planning or assuring patching, backup, recovery and continuity arrangements \nExperience supporting security monitoring and incident response, including the use of SIEM tooling, escalation, root-cause analysis and preventative action \nA practical understanding of IT service management, including incident, problem, change and asset management \nExperience creating and maintaining clear technical documentation, operational procedures, asset information and system records \nExperience working effectively with technology suppliers and considering licensing, support and service-management requirements \nDesirable Skills \nHands-on experience with Intune, Landscape, JumpCloud, Atlassian products or comparable administration tools \nITIL Foundation or an equivalent service-management qualification \nExperience with automation and Infrastructure as Code \nExperience of cloud infrastructure such as AWS and Azure. \nExperience working within ISO/IEC 27001, Cyber Essentials Plus or UK public-sector environments \nExperience contributing to agile delivery and developing IT policies, standards and procedures \nWhat You’ll Get \nCompetitive salary and benefits package \n28 days’ holiday plus bank holidays, with the option to buy or sell an additional week \nAnnual bonus \nCritical illness cover \n8% non-contributory pension \nPrivate healthcare and life insurance \nEnhanced parental leave \nFlexible working \nOpportunities for learning, development, and career progression \nSupportive and inclusive team environment \nThe chance to work on meaningful projects \nDiversity & Inclusion \nWe’re committed to building a diverse and inclusive workplace. We welcome applications from people of all backgrounds, experiences, and identities. \nIf you need any adjustments during the recruitment process, please let us know. We’re here to support you \nFurther Information: \nDue to the nature of the work and the sectors we support, any offer of employment will be subject to the successful completion of the relevant security screening and clearance process.\nThis role requires eligibility for [BPSS / SC / DV]clearance. 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