Email Services Engineer

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

Job Title: Email Services Engineer

Job Category: Engineering

Time Type: Full time

Minimum Clearance Required to Start: TS/SCI

Employee Type: Regular

Percentage of Travel Required: Up to 75%

Type of Travel: Local

Anticipated Posting End: 12/31/2026

The Opportunity

The CIS program supports our intelligence customer deliver IT services to conduct its globally distributed operations. We are driving an exciting technological transformation of customer IT services by leading the design, development, implementation, and operation of cutting‑edge solutions. This includes continuous service improvement through the modernization of IT system infrastructure.

CACI is looking for an experienced, innovative, and motivated Email Services Engineer to support the mission objectives and needs of the customer, the Defense Intelligence Agency. In this role, you will be the technical authority for designing and engineering enterprise‑wide email and collaboration services that meet stringent Intelligence Community and customer requirements. You will translate mission needs and architectural objectives into secure, resilient, scalable messaging ecosystems built across on‑premise, cloud, and Microsoft 365 platforms. You will guide modernization, conduct rigorous testing, and ensure seamless transition of engineered solutions into operations to maintain high‑performance, compliant, and mission‑ready communication services.

The position is contingent upon award of the DIA SITE III CIO Infrastructure Services (CIS) contract.

Responsibilities

• Analyze requirements, concepts of operations, and system architectures to create detailed messaging‑infrastructure designs aligned with program vision and operational objectives.
• Design efficient Microsoft Exchange and Outlook client architectures, retention and archiving strategies, and integration configurations.
• Implement PKI and other multifactor authentication mechanisms for physical and web‑based client access to backend messaging services.
• Integrate classification markings, security controls, and audit capabilities into messaging systems to meet IC and DoDIIS requirements.
• Maximize availability, resiliency, and reliability design parameters consistent with mission‑driven message‑delivery SLAs.
• Implement audit, archiving, retention, automation, and storage policies for email and related content to ensure compliance with IC, DoDIIS, DoD, and Federal regulations, and support collaboration workflows including Tableau and Power Apps.
• Document, accredit, and authorize new systems, applications, and major upgrades through the RMF process for testing and operational use.
• Coordinate with Engineering teams on storage and data solutions supporting SharePoint‑hosted content.
• Implement claims‑based and PKI‑driven authentication with role‑based access controls to meet mission security requirements.
• Support on‑premise, cloud‑based, and Microsoft 365 platform‑as‑a‑service designs, integrations, and deployments for SharePoint and related collaboration services.
• Provide guidance on migration strategies and the evolution of SharePoint‑based knowledge‑management platforms integrated with messaging ecosystems.
• Collaborate with Operations teams and Government stakeholders to refine requirements and ensure availability, reliability, resiliency, and operability of email and collaboration services.
• Research optimal design approaches and conduct Analyses of Alternatives to support informed decisions on technologies, feasibility studies, and proofs of concept.
• Incorporate capacity, performance, and service‑level metrics into email‑service designs to optimize user experience and infrastructure utilization.
• Produce engineering and design artifacts, test cases, training materials, and supporting documentation—including CONOPS—while working independently or providing guidance to small teams.
• Investigate emerging messaging and collaboration technologies, evaluate integration benefits, and conduct objective tradeoff analyses as part of Continual Service Improvement and innovation initiatives.
• Utilize Lab facilities to experiment, validate feasibility, and assess design and technology options for secure email architectures.
• Develop unit and system‑level test cases and scripts, ensuring thorough coverage and positive validation outcomes prior to deployment.
• Support the transition of engineered email solutions to Operations through acceptance testing, Blue/Green fielding, and early‑production rollouts.
• Provide advanced troubleshooting, repair, and optimization for messaging components, including those integrated with Virtual Desktop Infrastructure as applicable.
• Develop strategies covering planning, vendor evaluation, procurement, implementation, governance, compliance, and risk management.
• Support the full engineering‑to‑operations transition lifecycle to ensure sustained performance of messaging ecosystems.

Qualifications

Required:

• Must hold a current Top Secret SCI clearance with ability to obtain poly prior to start
• DOD 8140 Certification applicable to role (minimum Security+)
• HS and 16+ years of experience, an AA and 14+ years of experience, BS/BA and 12+ years of experience, MS/MA and 10+ years of experience, or PhD and 8+ years of experience
• Minimum 4 years of hands‑on experience designing, integrating, validating, and implementing IT hardware and software solutions
• Microsoft-certified Windows Server Hybrid Administrator Associate
• Willingness to learn new skills and new technologies

Desired

• Degree in Science, Technology, Engineering, or Mathematics
• Familiarity with IC ITE services and classified environments
• ITIL 4 Foundation Certification (or higher)

What You Can Expect

A culture of integrity.

At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high-performing group dedicated to our customer’s missions and driven by a higher purpose – to ensure the safety of our nation.

An environment of trust.

CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.

A focus on continuous growth.

Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground — in your career and in our legacy.

Pay Range

There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits.

Since this position can be worked in more than one location, the range shown is the national average for the position.

The Proposed Salary Range For This Position Is

$90,300-$189,600

CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.