Email Services Systems Administrator - TS/SCI with Polygraph

General Dynamics Information Technology • Washington, DC

1d • $96,569 - $130,651 • Onsite

About The Position

As an Email Services Systems Administrator supporting CIO Infrastructure Services (CIS), you will operate, secure, and optimize enterprise email and messaging services across complex multinetwork environments. You will maintain high availability email platforms, ensure reliable communication services, and sustain cloud enabled collaboration capabilities that directly support mission critical operations. Your work enhances the resilience, performance, and readiness of enterprise messaging systems relied on by users worldwide.

Requirements

• Active TS/SCI clearance with a favorable Polygraph
• Meet DoD 8140 Information Assurance Workforce certification requirements (e.g., Security+ CE)
• Hands-on experience administering Exchange (on-premises) and M365 messaging services in enterprise or multi-network environments
• Strong proficiency with email routing, SMTP, DNS, authentication, certificates, and mobile/ remote email access
• Experience with secure configuration, retention/archival policies, and compliance requirements for enterprise messaging
• Familiarity with patching, vulnerability remediation, and configuration compliance for messaging platforms
• Ability to diagnose and resolve complex messaging, access, routing, and authentication issues across hybrid environments
• Strong documentation, communication, and cross team collaboration skills
• US citizenship required
• Bachelor’s degree in an IT‑related field or 8+ years of relevant IT experience in lieu of a degree (for Senior role)
• Bachelor’s degree in an IT‑related field or 10+ years of relevant IT experience in lieu of a degree (for Principal role)
• Bachelor’s degree in an IT‑related field or 12+ years of relevant IT experience in lieu of a degree (for Sr. Principal role)

Nice To Haves

• Email Management
• Email Services
• Exchange

Responsibilities

• Administer, maintain, and troubleshoot enterprise Exchange and M365 email systems, ensuring high availability, secure operations, and reliable mail flow across multiple networks
• Support email architecture components including mailbox databases, transport services, journaling, archival/retention systems, SMTP relays, and message hygiene tools
• Manage identity and access for messaging services, including authentication, PKI based access, mobile access policies, and integration with directory services
• Monitor system health, capacity, and performance; perform diagnostics; and implement corrective actions for service disruptions or degraded functionality
• Support migrations, upgrades, and sustainment of both on premise and cloud based messaging platforms, ensuring seamless integration and minimal user impact
• Execute backup, recovery, and failover operations for Exchange systems and related messaging components, validating resilience and continuity of operations
• Troubleshoot complex issues involving authentication, DNS, PKI, mobile clients, cross domain routing, and dependencies across hybrid environments
• Maintain documentation, SOPs, service configurations, and operational artifacts supporting sustainment, change management, and continuous improvement
• Apply security patches, cumulative updates, and platform hotfixes across Exchange, M365, and messaging related infrastructure to maintain compliance and secure service baselines
• Identify and remediate noncompliant messaging systems by reviewing vulnerability and SCAP reports, resolving patch exceptions, and validating corrective actions across messaging environments

Benefits

• Variety of medical plan options, some with Health Savings Accounts
• Dental plan options
• Vision plan
• 401(k) plan offering the ability to contribute both pre and post-tax dollars up to the IRS annual limits and receive a company match
• Full flex work weeks where possible
• Variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave
• Short and long-term disability benefits
• Life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance

What This Job Offers

• Job Type: Full-time
• Career Level: Senior