IT & Software

Systems Administrator

Robert Half

London · Greater London · United Kingdom

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Overview

In this role you will maintain and secure the company’s global IT infrastructure with a cloud-first focus. You will work across international teams to ensure reliable, scalable systems and drive operational improvements. You’ll handle identity management, networking, and automation to reduce risk and improve performance. This is a hands-on position that combines technical delivery with collaboration and security. You will contribute to strategic infrastructure upgrades and cloud initiatives.

Responsibilities
  • Administer and support Microsoft 365, Microsoft Entra ID, Google Workspace and other enterprise SaaS platforms
  • Manage identity and access management including SSO, MFA, conditional access, provisioning and access permissions
  • Maintain Windows Server, Linux and cloud infrastructure environments
  • Support core networking services: DNS, DHCP, VPN, firewalls, Wi‑Fi and network connectivity
  • Monitor infrastructure performance, availability, security and capacity
  • Manage patching, vulnerability remediation, backups and disaster recovery
  • Develop PowerShell, Bash and Python scripts to automate administration and workflows
  • Manage integrations between enterprise apps using APIs, SAML, OAuth and SCIM
  • Provide Tier 2 and Tier 3 support for complex infrastructure and auth issues
  • Implement system hardening, security controls and compliance with Information Security
  • Support automated employee onboarding, offboarding and access management processes
  • Lead and participate in infrastructure upgrades, cloud migrations and global IT projects
  • Maintain technical documentation, configurations and diagrams
  • Collaborate with international IT teams and vendors to resolve incidents and implement global standards
  • Identify recurring technical issues, perform root-cause analysis and implement long-term solutions
Key requirements
  • Experience administering M365, Entra ID and Google Workspace
  • Strong identity and access management capabilities (SSO, MFA, conditional access)
  • Proficiency with Windows Server, Linux and cloud infrastructure
  • Networking experience including DNS, DHCP, VPN, firewalls, Wi‑Fi
  • Scripting skills (PowerShell, Bash, Python) for automation
  • Experience with API-based integrations (SAML, OAuth, SCIM)
  • Troubleshooting at Tier 2/3 level for infrastructure and authentication issues
  • Security-focused: system hardening, compliance and vulnerability remediation
  • Experience with backups, DR and disaster recovery
  • Ability to work across international teams and with vendors
  • Experience with cloud migrations and infrastructure upgrades
  • Excellent documentation and operational procedure skills
  • collaboration
  • problem-solving
  • strong communication
  • Microsoft 365
  • Microsoft Entra ID
  • Google Workspace

Reference: WJ-747_31244937 · Posted 08 Nov 2026, 12:30 AM

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