Senior Microsoft 365 & Cloud Infrastructure Engineer

Gresham; Greater Manchester; Hybrid; GBP 55,000 - 75,000; Full time

Job summary

Gresham seeks a Senior Support Engineer to own our Microsoft 365 estate, network infrastructure, and cloud services. BAU focus with exposure to transformation projects. You’ll be the technical expert for Microsoft 365, remote access solutions and cloud infrastructure (AWS), ensuring reliability and security of IT services.

We are open to locations in the UK - London, Manchester, Southampton or Bristol. Lead and mentor junior engineers, manage incidents, and collaborate with teams across

Qualifications

• 5+ years supporting Microsoft 365 / Office 365 in an enterprise environment.
• Strong knowledge of Exchange Online, Teams, SharePoint, OneDrive, Entra ID, and Intune.
• AWS cloud experience (EC2, S3, VPC, IAM) – or Azure equivalent.
• Good PowerShell scripting for automation and administration.
• Understanding of IAM concepts (SSO, SAML, OAuth, MFA).
• Excellent troubleshooting and problem‑solving skills.
• Leadership qualities with ability to mentor and guide junior team members.
• Certifications in Microsoft 365, AWS, or networking (e.g., MS-102, AWS SAA, CCNA).

Responsibilities

• Provide senior-level support for Microsoft 365 services including Exchange Online, Teams, SharePoint, OneDrive and Outlook.
• Manage Microsoft Entra ID (Azure AD) including user provisioning, conditional access, and MFA.
• Administer Microsoft Intune for device management and application deployment.
• Monitor service health, respond to incidents, and escalate to Microsoft support as needed.
• Configure security features and manage external collaboration scenarios.
• Manage VPN infrastructure and remote connectivity solutions.
• Strong IP networking: routing, subnets, VLANs, DNS, DHCP, and troubleshooting.
• Work with ISPs and WAN providers on circuit provisioning and fault resolution.
• Support SD-WAN configurations and monitor network performance.
• Support AWS cloud infrastructure (EC2, S3, VPC, IAM) – or Azure equivalent.
• Maintain hybrid cloud connectivity between on-premises and cloud environments.
• Monitor cloud resource utilization, cost optimization, and performance.
• Support cloud security configurations including security groups and IAM policies.
• Participate in backup, disaster recovery, and business continuity activities.
• Implement automation using PowerShell and scripting.
• Document technical configurations and create knowledge base articles.
• Support transformation activities related to business growth and organizational changes.
• Provide technical leadership and mentorship to junior engineers and service desk team.
• Act as an escalation point and technical authority for complex infrastructure issues.

Skills

Microsoft 365

Azure AD / Entra ID

Intune

Exchange Online

Teams

SharePoint

PowerShell

IAM & SSO

MFA

AWS

Networking basics

Education

Certifications in Microsoft 365 / AWS / networking (e.g., MS-102, AWS SAA, CCNA)

Tools

Exchange Online

Teams

SharePoint

OneDrive

Entra ID / Azure AD

Intune

PowerShell

AWS

Azure

SASE/SSE (Zscaler, Palo Alto)

Job description

Gresham seeks a Senior Support Engineer to own our Microsoft 365 estate, network infrastructure, and cloud services. BAU focus with exposure to transformation projects. You’ll be the technical expert for Microsoft 365, remote access solutions and cloud infrastructure (AWS), ensuring reliability and security of IT services.

We are open to locations in the UK - London, Manchester, Southampton or Bristol. Lead and mentor junior engineers, manage incidents, and collaborate with teams across