Principal Microsoft 365 Consultant

Role Introduction
We’re seeking an exceptional Principal Consultant to act as a senior technical authority. This role is ideal for an experienced engineer who thrives at 4th line support, complex project delivery, and cross-platform problem solving in multi-tenant environments typical of a Microsoft-focused MSP.

You’ll operate at the forefront of service excellence—architecting high-impact solutions, resolving deeply technical issues, and contributing to client-facing delivery across strategic and enterprise-level projects.

This is not a line management role but one where leadership is demonstrated through technical depth, collaboration, and influence.

What You Will Do
As a Principal M365 Consultant, you will:

Provide 4th line escalation and root cause analysis for complex issues across Microsoft 365 and Power Platform
Design and deliver robust multi-tenant solutions including migrations, integrations, advanced configurations, and governance frameworks
Own and maintain solution templates, automation scripts, and reusable assets to uplift technical maturity across the business
Collaborate with Service Transition teams to validate new customer environments, ensuring platform integrity and best-practice readiness
Lead technical aspects of M365 and Power Platform projects across diverse customer estates, supporting project managers and delivery leads
Advise customers on security posture enhancements, including Secure Score, audit log management, SIEM integration, and regulatory alignment
Ensure Power Platform governance policies, lifecycle models, and technical controls are applied consistently across customer environments
Support subscription and licensing management in collaboration with Asset Management and CSP services
Apply LLM prompt engineering and AI tooling to improve resolution workflows, automate documentation, and enhance knowledge reuse across support functions
Participate in technical workshops, discovery sessions, and client consultations as a senior subject matter expert
Track Microsoft roadmap developments and contribute to readiness planning and service evolution strategies
What You Will Have
As a Principal M365 Consultant, you will have:

Proven experience designing, supporting, and delivering Microsoft 365 solutions in MSP/multi-customer environments
Deep technical expertise across Microsoft 365 services: Exchange Online, SharePoint Online, Teams, OneDrive, and Entra ID
Strong working knowledge of the Power Platform ecosystem—including Power Apps, Power Automate, and Copilot Studio—with the ability to ensure governance, lifecycle controls, and tenant-level compliance
Proficiency with scripting, automation, and prompt engineering techniques using tools like PowerShell, Graph API, and LLM-integrated assistants to drive resolution and enhance productivity
Familiarity with management frameworks like Microsoft 365 Lighthouse and Intune in a delegated admin context
Capable of leading complex investigations and providing 4th line engineering support for deeply technical issues across customer estates
A strong communicator—able to present issues and solutions clearly to technical and non-technical stakeholders
Proactive in staying current with Microsoft’s evolving roadmap and able to advise on its operational and security impact
Passionate about delivering secure, scalable, and well-governed cloud environments without stepping into solution design or app development
Preferred Certifications

Microsoft 365 Administrator Expert
Microsoft Power Platform Fundamentals or Functional Consultant Associate
Azure Administrator Associate or Architect Associate
Microsoft Security certifications (MS-500, SC-200, SC-300)
 
What We Do For You
Wellbeing focused – Our people are our greatest assets, and ensuring everyone feels their best self to come to work is integral

Annual Leave – 26 days of annual leave, plus public holidays and the ability to buy additional days
Employee Assistance Programme – Free advice, support, and confidential counselling available 24/7 through Care First
Endometriosis Friendly Employer - We are proud to confirm our commitment to developing an environment and culture that allows those with endometriosis to thrive in the workplace
Personal Growth - Regardless of where you are at in your career, we’re committed to enabling your growth personally and professionally

Development Programmes – From Future Managers to Leadership Training, our development programmes help you get where you need to go
Performance Bonus – Our Group-wide bonus scheme enables you to reap the rewards of your success
Financial wellbeing - We understand as well as your mental wellbeing, your financial wellbeing is really important

Pension Scheme – Our plan with Scottish Widows offers 5% matched contribution by the company
Income protection insurance – Providing you with support and assistance when you need it most
Recognition – Highlighting and rewarding the great work our people do

Performance & Talent – Our own technology platform that allows you to get real-time feedback, conversations and goals to help you become your best self
Making a Difference – we provide opportunities to help our people make a difference to the causes they care about

MatchIt! – Fundraise for a cause close to your heart and OneAdvanced will match part of the funding
Volunteering Time – Our volunteering leave scheme allows you to use your time to help those who need it
Pennies from Heaven – donate the pennies from your pay check to help make a difference without lifting a finger
Who We Are
OneAdvanced is one UK's largest providers of business software and services serving 20,000+ global customers with an annual turnover of £330M+. We manage 1.5 million 111 calls per month, support over 2 million Further Education learners across the UK, handle over 10 million wills, and so much more. Our mission is to power the world of work and, as you can see, our software underpins some of the UK's most critical sectors.

We invest in our brilliant people. They are at the heart of our success as we strive to be a diverse, inclusive and engaging place to work that not only powers the world of work, but empowers the growth, ambitions and talent of our people.