Microsoft 365 Architect | London, UK | Hybrid

At SEI we value our employees and believe in driving growth through change. Part of building brave futures is making a concerted effort to develop and challenge our employees to achieve their goals through internal job mobility.

About SEI Sphere

SEI Sphere is a strategic and bespoke provider of IT services, both managed and professional, delivering end-to-end cybersecurity and cloud solutions. We help organizations secure their digital environments, optimize cloud operations, and maintain compliance through advanced technologies and 24/7 managed services. Our mission is to provide resilience, agility, and growth for clients in an evolving threat landscape.

Role Overview

This is a newly created position, established because of the rapid growth and ongoing expansion of our Microsoft 365 program at SEI Sphere. As our M365 practice has grown, we are seeking a Microsoft 365 Architect to lead and own our M365 practice within SEI Sphere. This role offers the opportunity to design, implement, and manage enterprise-grade Microsoft 365 solutions while collaborating closely with our 24/7 operations team. The ideal candidate will combine deep technical expertise with strong client-facing communication skills and thrive in a hybrid work environment.

Key Responsibilities

• Architect solutions across the Microsoft 365 suite of products including OneDrive, SharePoint, Teams (including Teams Calling), Intune, Power Automate, and Windows 365 Cloud PCs.
• Drive adoption and configuration of Microsoft Purview for data governance, DLP, and compliance reporting.
• Develop governance blueprints, information architecture, and lifecycle management.
• Lead tenant-level design decisions (domains, identity, conditional access, security baselines) in partnership with Security Engineering.
• Optimize Microsoft 365 licensing models and cost structures for clients; provide licensing guidance during presales.
• Serve as a trusted advisor for clients, providing clear communication, roadmaps, and executive-ready documentation.
• Collaborate with the 24/7 operations team to ensure service continuity, incident response, and root-cause analysis.
• Own the M365 backlog, standards, and best practices; maintain reference architectures and runbooks.
• Support presales activities: scoping, solution design, estimates, and proposals for M365 engagements.

Qualifications

• Deep hands-on expertise across Microsoft 365.
• Strong understanding of Microsoft 365 licensing, security, governance, and compliance frameworks.
• Proven experience architecting and implementing enterprise M365 solutions; previous MSP experience highly recommended.
• Excellent client-facing communication, consulting, and presentation skills.
• Ability to operate in a hybrid environment and manage multiple concurrent projects.

Certifications

• Microsoft 365 Certified: Administrator Expert (MS-102)
• Microsoft Certified: Information Protection Administrator Associate (SC-400) or equivalent (Purview/DLP)
• Microsoft Certified: Identity and Access Administrator Associate (SC-300)
• Power Platform Solution Architect (PL-600)
• Azure Virtual Desktop (AZ-140)
• Microsoft 365 Certified: Endpoint Administrator Associate (MD-102)

Success Metrics

• Time-to-value for new tenant deployments and major feature rollouts.
• Adoption KPIs across Microsoft 365 services; automation ROI from Power Automate workflows.
• Incident MTTR and change success rate in partnership with the 24/7 operations team.
• Client satisfaction (CSAT) and renewal/expansion outcomes.

Why Join SEI Sphere

Work with cutting-edge cloud and security technologies, influence enterprise architecture decisions, and lead a growing Microsoft 365 practice within a global MSSP. At SEI Sphere, we believe our people are our greatest asset. We foster a supportive, collaborative environment and are committed to maintaining a healthy work-life balance-ensuring our team members are empowered to do their best work. We invest in your growth, well-being, and long-term success.

SEI is an Equal Opportunity Employer and so much more...

After over 50 years in business, SEI remains a leading global provider of investment processing, investment management and investment operations solutions. Reflecting our experience within financial services and financial technology our UK office is based between the City of London and the growing technology hub of Shoreditch. The open plan nature of our office space, flowing lines and numerous art installations are designed to encourage innovation and creativity in our workforce. We recognise that our people are our most valuable asset and are (literally) invested in your success; we know that a healthy, happy and motivated workforce is key to our continued growth. We are focused on ensuring a healthy work-life balance and offer our employees benefits which include private medical care for you and your family, access to GPs online for appointments, enhanced family leave, volunteer days, access to thriving employee networks and not forgetting free fruit twice a week.

SEI Investments (Europe) Limited ('SIEL') is authorised and regulated by the Financial Conduct Authority (FRN AI Acceptable Use in the application and interview process: SEI acknowledges the growing integration of artificial intelligence (AI) tools into individuals' personal and professional lives. If you intend to incorporate the use of any AI tools at any stage of the application and/or interview process, please ensure you have reviewed and adhere to our AI use guidelines.