Email Services Systems Administrator - TS/SCI with Polygraph

General Dynamics - IT; Corridor North (MD); On-site; USD 120,000 - 160,000; Full time

Benefits offered by this job

Comprehensive benefits and wellness

401K with company match

Paid time off

Job summary

General Dynamics - IT is seeking an Endpoint Management Systems Administrator to secure, operate, and optimize enterprise email and messaging services across complex multinetwork environments. You will ensure high availability and seamless mail flow for Exchange and M365, both on premise and in the cloud, enabling reliable collaboration for mission critical operations. Active TS/SCI clearance with a favorable Polygraph is required.

Ethereum? No, TS/SCI.

Qualifications

• Experience administering Exchange and M365 in enterprise/multi-network environments.
• Experience with security patches, updates, and compliance for messaging platforms.
• Strong documentation and cross-team collaboration skills.
• Hands-on experience managing messaging architectures including archival/retention and journaling.

Responsibilities

• Administer, maintain, and troubleshoot Exchange and M365 across multiple networks for high availability.
• Support mailbox databases, transport services, journaling, archival/retention systems, SMTP relays, and mail hygiene tools.
• Manage identity and access, including PKI-based access and directory integration.
• Monitor system health, capacity, and performance; diagnose and remedy disruptions.
• Support migrations, upgrades, and sustainment of on-prem and cloud-based messaging platforms.
• Execute backup, recovery, and failover operations for Exchange and messaging components.
• Troubleshoot complex issues across hybrid environments (authentication, DNS, PKI, mobile access).
• Maintain documentation, SOPs, and configurations for sustainment and change management.

Skills

Email systems administration

Hybrid messaging environments

Identity and access management

Documentation

Education

Bachelor's degree in IT-related field

8+ years IT experience in lieu of degree

Tools

Exchange on-premises

Microsoft 365 (M365)

PKI authentication

DNS

Job description

ENDPOINT MANAGEMENT SYSTEMS ADMINISTRATOR YOUR IMPACT

Own your opportunity to support national defense. Your work will help keep critical operations secure and connected across the global enterprise - directly, contributing to a mission that protects our nation every day. CIO Infrastructure Services (CIS) is growing, and we invite both our experienced incumbents and new team members to be part of what's next. Incumbents bring invaluable mission insight, while new talent adds fresh ideas and energy. Together, we'll strengthen continuity and drive the next generation of innovation.

MEANINGFUL WORK AND PERSONAL IMPACT

As an Email Services Systems Administrator supporting 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.

KEY 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

WHAT YOU'LL NEED TO SUCCEED

See below.

EXPERIENCE REQUIREMENTS

• Email Services Systems Administrator Senior - Requires a Bachelor's degree in an IT-related field or 8+ years of relevant IT experience in lieu of a degree.
• Email Services Systems Administrator Principal - Requires a Bachelor's degree in an IT-related field or 10+ years of relevant IT experience in lieu of a degree.
• Email Services Systems Administrator Sr. Principal - Requires a Bachelor's degree in an IT-related field or 12+ years of relevant IT experience in lieu of a degree.

CLEARANCE

• Active TS/SCI clearance with a favorable Polygraph

CERTIFICATIONS

• 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.

LOCATION

Onsite

US citizenship required

GDIT IS YOUR PLACE

At GDIT, the mission is our purpose, and our people are at the center of everything we do.

GROWTH

AI-powered career tool that identifies career steps and learning opportunities

SUPPORT

An internal mobility team focused on helping you achieve your career goals

REWARDS

Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off

COMMUNITY

Award-winning culture of innovation and a military-friendly workplace

OWN YOUR OPPORTUNITY

Explore an enterprise IT career at GDIT and you'll find endless opportunities to grow alongside colleagues who share your desire to drive operations forward. #CIS