Mission-Critical Email Services Engineer (TS/SCI)

CACI International Inc; Chantilly (VA); On-site; USD 90,000 - 190,000; Full time

Job summary

CACI International Inc. is seeking an Email Services Engineer to design, implement, and operate secure, scalable messaging across on‑premise, cloud, and Microsoft 365 environments for the DIA.

You will drive modernization, perform testing, and ensure a smooth transition to operations with robust security and compliance. The role requires deep expertise in Exchange/Outlook architectures, PKI/MFA, classification markings, and RMF accreditation, with a strong focus on availability, reliability, and

Qualifications

• Must hold a current TS/SCI clearance with ability to obtain poly.
• DOD 8140 certification applicable to the role (minimum Security+).
• Extensive experience with IT hardware and software design and integration.
• Microsoft-certified Windows Server Hybrid Administrator Associate.

Responsibilities

• Analyze requirements and architectures to create detailed messaging-infrastructure designs.
• Design Exchange/Outlook architectures, retention, and archiving strategies.
• Implement PKI and MFA for secure client access to messaging services.
• Integrate security controls and auditing to meet IC/DoD requirements.
• Ensure high availability, resiliency, and mission-focused SLAs.
• Document, accredit, and authorize new systems via RMF for testing and ops.

Education

High School Diploma

Associate's degree

Bachelor's degree

Master's degree

PhD

Job description

CACI International Inc. is seeking an Email Services Engineer to design, implement, and operate secure, scalable messaging across on‑premise, cloud, and Microsoft 365 environments for the DIA.

You will drive modernization, perform testing, and ensure a smooth transition to operations with robust security and compliance. The role requires deep expertise in Exchange/Outlook architectures, PKI/MFA, classification markings, and RMF accreditation, with a strong focus on availability, reliability, and