Senior 3rd Line Engineer – M365 & Cyber Security

ECS Resource Group; Aldershot; On-site; GBP 45,000 - 55,000; Full time

Job summary

The ECS Resource Group is seeking a 3rd Line Support Engineer to manage Microsoft 365 and cyber security for UK customers from their Hampshire base in Aldershot. You will act as the technical escalation point, owning customer environments and delivering reliable IT services.

You will handle Microsoft 365 tenants, Entra ID, MFA and conditional access, plus endpoint security, patching, backup and monitoring. Onboarding new customers and improving internal standards are also part of the role.

Qualifications

• At least 3 years in hands-on Microsoft 365 administration.
• Senior support, systems administration or MSP experience.
• Hands-on cyber security work: endpoint protection, alerts, patching and backup.
• Experience with Kaseya or similar platforms (Datto, Autotask, IT Glue, ConnectWise, NinjaOne).
• Strong Windows and business IT troubleshooting.
• Experience documenting customer interactions and actions.

Responsibilities

• Managing Microsoft 365 tenants: users, groups, licences, mailboxes, security settings and access controls.
• Working across the M365, Exchange, Teams and SharePoint admin centres and Entra ID.
• Setting up and supporting MFA, conditional access, and joiner, mover and leaver processes.
• Running endpoint security, patching, backup and monitoring, and responding to security alerts.
• Onboarding new customers, including discovery, tenant reviews, documentation and setup.
• Improving internal processes and technical standards.

Skills

Microsoft 365 administration

Customer-facing communication

Documentation

Tools

Kaseya

Datto

Autotask

IT Glue

ConnectWise

NinjaOne

Entra ID

Job description

The ECS Resource Group is seeking a 3rd Line Support Engineer to manage Microsoft 365 and cyber security for UK customers from their Hampshire base in Aldershot. You will act as the technical escalation point, owning customer environments and delivering reliable IT services.

You will handle Microsoft 365 tenants, Entra ID, MFA and conditional access, plus endpoint security, patching, backup and monitoring. Onboarding new customers and improving internal standards are also part of the role.