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Your Trusted Partner in Enterprise IT Systems Engineering
DEi combines experience and innovative ideas to provide our clients the right solution with the right people at the right time. We are a proven IT services and solutions provider for full-lifecycle engineering of network, storage, cyber security, communication and policy compliance needs. We focus on delivering IT solutions to meet complex technological and business challenges within mission-critical enterprises. DEi is an ISO 9001:2015, 20000:2018, and 27001:2022-certified, process-oriented company. Our engineers, administrators, project and program managers and support staff focus on consistently enhancing, optimizing, operating and maintaining your entire enterprise IT environment, from the backend infrastructure to individual end-user devices and everything that connect them.
Trusted Experts in Enterprise IT & Cybersecurity
For over two decades, Defense Engineering Inc. (DEi) has delivered innovative enterprise IT engineering and mission-focused technology solutions to the Federal Government. DEi specializes in modernizing complex IT architectures, enabling agencies to securely transform their networks, infrastructure, and cloud environments to meet evolving mission requirements.
Our team of highly skilled engineers, architects, and program professionals supports executive-level Department of Defense organizations with expert engineering, strategic consulting, precise cost analysis, and dependable service delivery. By combining deep technical expertise with a mission-first mindset, DEi helps government customers deploy resilient, secure, and scalable technology solutions that strengthen operational readiness and enterprise performance.
Headquartered in Manassas, Virginia, DEi proudly supports a wide range of Federal and Defense organizations, delivering trusted engineering services that drive modernization across enterprise networks, cloud platforms, and mission systems.
- Founded in June 2005
- ISO/IEC 27001:2022 Certified (#53711247380286)
- Corporate Locations: Manassas, VA (HQ)
- ISO/IEC 9001:2015 Certified (#93846290822392)
- Participating member of the Defense Industrial Base (DIB)
- DCAA Approved Accounting System
- ISO/IEC 20000:2018 Certified (#31849188357298)
- Personnel Clearance: Over 95% of our employees hold TS or TS/SCI Clearance
Commitment to Quality
Quality and technical excellence are foundational to every solution DEi delivers. Our teams combine disciplined engineering practices, modern technologies, and rigorous quality standards to ensure every engagement delivers measurable value.
- Deliver solutions on schedule, within budget, and aligned with mission objectives
- Apply proven engineering processes and continuous process improvement
- Integrate automation, innovation, and best practices into solution delivery
- Maintain strict adherence to federal standards, security requirements, and quality frameworks
Commitment to Our Associates
DEi recognizes that our people are the driving force behind our success. We foster a collaborative environment that encourages innovation, professional growth, and technical excellence.
- Invest in employee training, certifications, and professional development
- Promote a culture of innovation, collaboration, and technical leadership
- Provide competitive compensation, benefits, and career advancement opportunities
- Support a healthy balance between professional achievement and personal well-being
Our Mission
Defense Engineering Inc. (DEi) delivers innovative, secure, and mission-focused IT engineering solutions that help federal organizations modernize enterprise systems, strengthen cybersecurity, and enable critical national security missions.
- Deliver advanced IT engineering, cloud, cybersecurity, and digital modernization solutions
- Apply innovative technologies, automation, and proven engineering frameworks
- Support the complex and evolving mission needs of the Federal Government
- Enable customers to achieve operational excellence and mission readiness
Core Values
- Integrity – We operate with honesty, transparency, and the highest ethical standards.
- Mission Focus – We remain dedicated to supporting our customers’ most critical national security missions.
- Technical Excellence – We deliver innovative, high-quality engineering solutions that exceed expectations.
- Accountability – We take ownership of our work and deliver measurable results.
- Collaboration – We work closely with our customers and partners to achieve shared success.
- Continuous Improvement – We constantly refine our processes, technologies, and expertise to stay ahead of emerging challenges.