Senior Service Desk Engineer - £400-£450 per day, Inside IR35, 6 months initial contract - hybrid working with 3 days a week on site near Euston Station.My client is looking for an experienced Senior Service Desk Engineer with strong 3rd line support experience to join their growing IT function. This is an excellent opportunity for a highly capable engineer with deep expertise in Intune/Endpoint Manager and Power Apps, alongside advanced Microsoft technology skills and a solid background in resolving complex technical issues. The successful candidate will play a key role in escalated support, automation, service improvement, and mentoring junior team members. Key Responsibilities - Act as a 3rd line escalation point for complex Incidents, Problems, and non-standard Requests.Provide advanced technical support across the Microsoft ecosystem: Active Directory, Azure, Microsoft 365, Exchange, Intune/Endpoint Manager, and Power Apps.Design, develop, and maintain Power Apps solutions to automate workflows and integrate with Microsoft 365 and other data sources.Configure, manage, and troubleshoot Intune/Endpoint Manager for device compliance, application deployment, and endpoint security.Investigate and resolve complex endpoint issues and policy-related challenges.Follow the organisation''s Change Control procedures for authorised changes.Work closely with the Service Desk Manager and other IT teams to ensure seamless service delivery.Monitor service desk performance metrics and ide