Sr. Engineer, Infrastructure and Platform Services

Location: Henderson, NV Salary: $120,000.00 USD Annually - $130,000.00 USD Annually Description:
Sr. Engineer - Infrastructure & Platform Services (Microsoft 365 / Exchange)

Location: Henderson, NV /Irving, TX

Job Type: Full-Time

About the Role

We are seeking a Senior Infrastructure & Platform Engineer with deep expertise in Exchange Online, Hybrid Exchange, Microsoft 365, and Email Security. This is a hands-on Level 3 engineering role focused on supporting and optimizing enterprise messaging environments. The ideal candidate is a technical expert, independent problem solver, and strong communicator who can quickly contribute as a senior peer on an experienced team.

Key Responsibilities

• Administer and support Exchange Online and Hybrid Exchange environments.
• Troubleshoot mail flow, connectors, transport rules, message delivery, and hybrid configurations.
• Manage and support Microsoft 365 services in a large enterprise environment.
• Administer email security solutions such as Proofpoint, Mimecast, Defender for Office 365, or EOP.
• Investigate security threats, quarantine issues, phishing attempts, and policy-related incidents.
• Utilize PowerShell for Exchange and M365 administration, troubleshooting, and automation.
• Support Power Automate / Power Platform workflows and administration.
• Handle escalations, incidents, operational support, and project work.
• Create and maintain technical documentation and operational procedures.

Required Skills

• Deep expertise in Exchange Online and Hybrid Exchange.
• Strong experience with Microsoft 365 / Office 365 administration.
• Hands-on experience with Proofpoint or similar email security platforms.
• Solid PowerShell scripting and automation skills.
• Knowledge of mail flow, message trace, connectors, transport rules, SPF, DKIM, and DMARC.
• Exposure to Power Automate / Power Platform.
• Familiarity with Microsoft Entra ID; Intune experience is a plus.
• Strong troubleshooting, communication, and stakeholder management skills.

Ideal Candidate

• Senior/L3 engineer with ownership of complex messaging environments.
• Experienced in both operational support and project delivery.
• Self-driven, consultative, and able to work independently with minimal supervision.

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