✦ Luna Orbit — DevOps & SRE

Systems Engineer, Messaging

at Marriott International

📍 Bethesda, MD, United States Hybrid Posted April 02, 2026
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Position Details

Type Full-Time
Experience senior
Exp. Years 5+ years
Education Not specified
Category DevOps & SRE

About this role

Senior systems engineer responsible for enterprise email/messaging platforms, focusing on Exchange Online, Defender for Office 365, and Cisco Secure Email, with emphasis on security, policy design, and hybrid mail flow at scale.

Key Responsibilities

  • Own Exchange Online/EOP/MDO configuration and policy; operate Cisco Secure Email; lead mail-flow modernization; implement secure SMTP relay; enforce email authentication; hybrid Exchange operations

Technical Overview

Stacks include Microsoft 365 Defender, Exchange Online, Cisco IronPort/ESA/CES, SPF/DKIM/DMARC, PowerShell (EXO v3), Graph API, and SIEM tooling (Splunk). Requires strong scripting, policy design, and hybrid architecture experience.

Ideal Candidate

The ideal candidate is a senior systems engineer with hands-on Exchange Online and security tooling experience, comfortable with hybrid mailflow architectures, and adept at agile delivery.

Must-Have Skills

None listed

Required Skills

Undergraduate degree in engineering or computer science; 5+ years IT engineering including 2-4+ years in enterprise email/messaging; Exchange Online and EOP; Cisco Secure Email; SPF; DKIM; DMARC; PowerShell; EXO v3; Graph API; Agile; Scrum; Kanban; Hybrid Exchange; on-prem and cloud integration; Splunk; CI/CD; incident response; SIEM

Industry & Role

Industry Technology
Job Function Design, implement, and sustain enterprise messaging services with strong security and hybrid capabilities.
Role Subtype Microsoft 365 Admin
Tech Domains Microsoft 365, Exchange Online, Azure, Active Directory, Graph API, PowerShell, Security tooling, Splunk, Cisco Secure Email

Keywords for Your Resume

systems engineer messagingexchange onlineexchange online protectionmicrosoft defender for office 365cisco secure emailironportdkimspfdmarcmail flowconnectorsremote domainstransport rulespowershellexo v3graph apiagilescrumkanbanhybridsplunkpower shell
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