Corporate IT Systems Administrator

Corporate IT Systems Administrator

Work Model: Hybrid (regular on-site presence expected)

Location: Oxford Circus, London, UK

Reports To: Corporate IT Lead (interim: CTO)

About the Role

We are a fast-growing technology company operating in the GPU compute infrastructure space. Our London office supports a mix of business and technical teams who depend on a well-run, well-integrated IT environment to work effectively.

As our Corporate IT Systems Administrator, you will own the day-to-day IT operations for our London office - ensuring devices are provisioned and managed, identities are well-governed, domains and email systems run reliably, and our SaaS stack is properly integrated.

While user support is part of the role when required, the primary focus is systems administration, reliability, and documentation .

This is a foundational hire - you will be the first dedicated IT presence in London, reporting into senior leadership. It's a classic corporate IT role for someone who takes pride in clean systems, strong processes, and a smoothly running environment.

What You'll Be Doing

Identity & Access Management

• Administer JumpCloud as the central IdP and MDM platform: directory management, user life cycle, and device policies
• Design and maintain SSO integrations across the SaaS stack using SAML 2.0, OIDC, and SCIM
• Own joiners/movers/leavers processes end-to-end
• Enforce access control aligned with least-privilege principles and compliance requirements

Microsoft 365 Administration

• Manage the M365 tenant: users, groups, Exchange, SharePoint, Teams, and licensing
• Configure and maintain Entra ID (Azure AD): conditional access, MFA, identity governance
• Maintain security and compliance features including DLP and audit logging
• Manage organisation-wide templates and shared assets

Domain & Email Infrastructure

• Administer DNS across company domains
• Maintain SPF, DKIM, and DMARC configurations
• Manage email routing, distribution groups, and shared mailboxes

SaaS Tool Administration

• Administer platforms such as Slack, Jira, and Confluence
• Onboard new tools with SSO/SCIM and ensure security standards are met
• Manage vendors, licensing, and renewals

Device & Asset Management

• Oversee provisioning and management of Windows, macOS, and Linux devices
• Act as escalation point for Linux-related IT support
• Maintain asset inventory and manage full hardware life cycle

IT Process & Documentation

• Document systems, integrations, and runbooks
• Improve processes and introduce automation where beneficial
• Maintain audit-ready IT controls and supporting evidence

User Support (Secondary)

• Act as escalation point for complex IT issues
• Support a largely self-sufficient engineering team when needed

Must-Have Requirements

• 3+ years in IT systems administration or corporate IT
• Strong Microsoft 365 experience (Exchange, SharePoint, Teams, Entra ID)
• Hands-on experience with SSO (SAML 2.0/OIDC) and IdPs (JumpCloud, Okta, or similar)
• Practical DNS and domain management experience (SPF, DKIM, DMARC)
• Familiarity with MDM/IdP platforms (JumpCloud, Okta, Intune, Jamf, etc.)
• Working knowledge of Linux fundamentals
• Comfortable in a startup or scaling environment
• Strong documentation mindset

Nice to Have

• Exposure to ISO 27001 or SOC 2 controls
• Scripting skills (PowerShell, Bash, etc.)
• Experience with Atlassian tools (Jira, Confluence)
• Familiarity with EDR tools such as CrowdStrike Falcon