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Senior Microsoft 365 Cloud Administrator

Ultra Clean Holdings (UCT) is a leading provider of critical subsystems, components, and ultra-high-purity cleaning services for the semiconductor industry — helping the world's top chipmakers build the technology behind everything from smartphones to AI. Headquartered in Hayward, California.

Ultra Clean doesn't manufacture AI directly, but it's a critical infrastructure supplier without which AI chips couldn't be produced.

The Opportunity

We're looking for a Senior Microsoft 365 Cloud Administrator to take the technical helm of our entire Microsoft 365 ecosystem. This isn't a support role — it's a chance to architect, secure, and shape the future of collaboration and identity across the organization. You'll operate with real autonomy, sit at the table for major security and infrastructure decisions, and mentor the next generation of admins.

If you love owning a platform end-to-end — from Exchange and Teams to Entra ID and Zero Trust — and want your fingerprints on every major rollout, this is your seat.

What You'll Own

The Tenant, Top to Bottom

Run point on Exchange Online, Teams, SharePoint, and OneDrive as the senior technical owner — leading migrations, feature rollouts, and setting the governance standards everyone else follows.

Identity & Security Architecture

Design access controls in Microsoft Entra ID (MFA, Conditional Access, privileged roles) and partner with security teams on DLP, retention, eDiscovery, and phishing defense. Okta experience a plus.

Email Security at Scale

Lead Exchange mail flow architecture and partner on Mimecast (or similar) for phishing protection, continuity, and message tracing.

Automation & Optimization

Build PowerShell automation that scales — access reviews, reporting, lifecycle management — while optimizing licensing to balance cost and capability.

Leadership & Influence

Be the escalation point for the toughest Tier 2/3 issues, mentor junior admins, and collaborate across Infrastructure, Security, Compliance, and HRIS.

What You Bring:

• 5–8+ years administering Microsoft 365 in an enterprise environment, with a track record of owning complex platforms at scale
• Deep expertise in Exchange Online, Teams, SharePoint, OneDrive
• Advanced knowledge of Entra ID (Azure AD) and identity lifecycle management
• Strong PowerShell scripting chops
• Solid grasp of cloud security, compliance, and governance

Nice to have: Okta, Mimecast, Intune/Zero Trust experience, Microsoft 365 Certified: Administrator Expert, or background in a regulated industry (finance, healthcare, government).

3 days a week on site in Liberec is there normal work expectations

Interview process: (2 total interviews)

1 hour with the manager and one engineer who are in Liberec

30-minute final interview with the VP who runs the department who's here in the US