Senior Exchange & Security Systems Administrator (Hybrid)

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

Job summary

Neumo is seeking a Sr. Systems Administrator to lead the Exchange and Microsoft 365 messaging environment across on‑premises and cloud deployments. The role focuses on hybrid mail flow, security, and compliance in a multi-site setup, including Proofpoint integration and rigorous governance.

The ideal candidate has 6+ years in enterprise messaging, strong scripting skills, and a track record of upgrades, migrations, and secure mail flow management in complex environments.

Qualifications

• 6+ years of experience in enterprise messaging administration or equivalent.
• Experience with Microsoft Exchange (on‑premises and cloud) and hybrid configurations.
• Proficient in PowerShell automation for Exchange and M365.

Responsibilities

• Lead administration of Exchange on‑premises including DAG, mailbox databases, connectors, transport rules, and hybrid mail flow.
• Oversee Exchange Online and Microsoft 365 messaging services for performance and compliance.
• Manage hybrid environments including Entra Connect and identity sync.
• Maintain Proofpoint and mail hygiene solutions.
• Support Teams/Outlook integration, shared mailboxes, and mail routing.

Skills

Exchange on-prem & cloud

Hybrid Exchange architecture

PowerShell scripting

Microsoft 365 admin

Proofpoint & email security

M365 security/compliance

PKI, DNS & encryption

Tools

Entra Connect

Job description

Neumo is seeking a Sr. Systems Administrator to lead the Exchange and Microsoft 365 messaging environment across on‑premises and cloud deployments. The role focuses on hybrid mail flow, security, and compliance in a multi-site setup, including Proofpoint integration and rigorous governance.

The ideal candidate has 6+ years in enterprise messaging, strong scripting skills, and a track record of upgrades, migrations, and secure mail flow management in complex environments.