Senior Exchange & M365 Systems Administrator (Hybrid)

Neumo Holdings LLC; Fairfield (CA); On-site; USD 120,000 - 140,000; Full time

Job summary

Neumo Holdings LLC in Fairfield, CA, seeks a Sr. Systems Administrator for Office 365 / Exchange to manage Exchange on-premises and Exchange Online, plus 365 tenant administration and security.

The role focuses on hybrid environments, Proofpoint, eDiscovery, PRA, and compliance, with a leadership stance within the SysAdmin team. A CLETS background check is required to work in the United States.

Qualifications

• 6+ years of experience in enterprise messaging administration.
• Experience with hybrid Exchange design and troubleshooting.
• Experience with Proofpoint, eDiscovery, PRA, and compliance.
• MCSE Messaging / M365 Messaging Administrator certifications preferred.
• Strong PowerShell automation skills.
• Ability to work across sites and datacenters.

Responsibilities

• Lead administration of Exchange on-premises including DAG configuration, mailbox databases, connectors, transport rules, and hybrid mail flow.
• Oversee Exchange Online and Microsoft 365 messaging services, ensuring performance and compliance.
• Manage hybrid environments including Entra Connect, identity sync, and coexistence strategies.
• Maintain and optimize Proofpoint (email security, DLP, TAP, encryption, routing).
• Support Teams/Outlook integration, shared mailboxes, and mail routing.
• Troubleshoot advanced messaging issues across hybrid environments.

Skills

Microsoft Exchange

Exchange Online

Microsoft 365

PowerShell

eDiscovery

Proofpoint

Hybrid architecture

DNS/PKI

Mail flow

Documentation

Communication

Education

MCSE Messaging

M365 Messaging Administrator

Security Administrator

Tools

Entra Connect

DAG

Exchange Admin Center

Job description

Neumo Holdings LLC in Fairfield, CA, seeks a Sr. Systems Administrator for Office 365 / Exchange to manage Exchange on-premises and Exchange Online, plus 365 tenant administration and security.

The role focuses on hybrid environments, Proofpoint, eDiscovery, PRA, and compliance, with a leadership stance within the SysAdmin team. A CLETS background check is required to work in the United States.