Infrastructure Engineer - Systems Integrator

Hamilton Barnes Associates Limited is seeking a Microsoft 365 Infrastructure Engineer to oversee administration and maintenance of enterprise productivity, messaging, and identity management across hybrid cloud environments. You will manage identity federation, troubleshoot authentication, and ensure service availability while partnering with internal IT teams to strengthen security.

The role requires hands-on experience with Microsoft 365, Exchange Online and on-premises, Entra ID, and OKTA in

Provide technical support and administration across the Microsoft 365 ecosystem

Manage Exchange Online and Exchange on-premises

Support hybrid Exchange environments and migrations

Manage Microsoft Entra ID and enterprise identity services

Administer OKTA and identity federation

Resolve authentication, access and permission issues

Support Microsoft 365 services including Teams, SharePoint, OneDrive

Collaborate with IT stakeholders to drive improvements and security

Experience with Microsoft 365 across enterprise environments, including Exchange Online and on-premises.

Azure AD/Microsoft Entra ID experience in enterprise settings.
Experience with OKTA and federation architectures.
Strong troubleshooting and problem-solving skills in complex IT environments.
Experience in large multinational enterprise environments and cross-team collaboration.