Microsoft System Administrator

Job description

Senior Microsoft 365 Administrator

Hoddesdon, UK | Hybrid (onsite & remote) + occasional UK travel

We’re recruiting a Senior Microsoft 365 Administrator to take ownership of the administration, optimisation, and security of a complex Microsoft 365 environment within a highly regulated, global organisation operating to ITIL / ISO standards.

This is a hands‑on, senior technical role with real influence — ideal for someone who enjoys leading initiatives, acting as a technical authority, and mentoring others while driving continuous improvement.

The Role

You’ll be responsible for the end‑to‑end management of Microsoft 365 services, ensuring stability, performance, security, and alignment with organisational goals. Acting as a subject matter expert, you’ll lead migrations, enhancements, and optimisations, while supporting complex escalations and guiding junior team members.

The role involves a mix of strategic ownership and hands‑on delivery, with collaboration across IT and business teams.

Key Responsibilities

• Lead administration, management, and optimisation of Microsoft 365 services
• Own and deliver migrations, updates, and platform improvements
• Use PowerShell scripting and automation to drive efficiency and best practice
• Act as SME for complex escalations, troubleshooting and resolving issues
• Develop, document, and maintain processes, procedures, and standards
• Manage patch testing and deployment across end‑user devices
• Monitor and maintain security, compliance, and risk controls
• Mentor and support junior IT team members
• Collaborate cross‑functionally to align M365 initiatives with wider business goals
• Stay current with emerging Microsoft technologies and recommend improvements
• Support Microsoft 365‑related projects from design through delivery

What We’re Looking For

Essential:

• 8+ years’ experience working in a Microsoft enterprise environment
• Strong hands‑on expertise with Microsoft 365, including:
• Intune
• Exchange Online
• SharePoint Online
• Microsoft Teams
• Proven experience leading M365 migrations and optimisations
• Advanced PowerShell scripting and automation skills
• Strong understanding of identity, security, compliance, and modern architectures
• Excellent problem‑solving and troubleshooting capability
• Confident communicator, able to explain technical concepts clearly
• Experience mentoring or leading other technical team members

Desirable:

• Microsoft certifications (e.g. Enterprise Administrator Expert, Modern Desktop Administrator)
• Experience working in regulated or ISO‑aligned environments

Why Apply?

• Senior, influential role with real ownership
• Technically complex Microsoft 365 estate
• Collaborative, professional IT environment
• Opportunity to shape standards, processes, and future direction
• Mix of strategic work and hands‑on technical delivery

Interested?

Apply directly via LinkedIn or reach out for a confidential discussion.

Planet Pharma is an equals opportunities Recruitment Business and Agency. We welcome applications from all suitably qualified candidates regardless of their race, sex, disability, religion/belief, sexual orientation, or age.

Extra information

Status

Open

Education Level

Secondary School

Location

Cardiff

Type of Contract

Full-time jobs

Published at

09-02-2026

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English