Senior Principal Systems Engineer - Military veterans preferred

ManTech (


  full-time   employee

United States

Where applicable, confirmation that you meet customer requirements for facility access which may include proof of vaccination and/or attestation and testing, unless an accommodation has been approved.

Secure our Nation, Ignite your Future

Become an integral part of a diverse team while working at an Industry Leading Organization, where our employees come first.  At ManTech International Corporation, you will help protect our national security while working on innovative projects that offer opportunities for advancement. 


ManTech is looking for a motivated, customer-oriented Sr Principal Systems Engineer in support of a secure Windows based Information System in Chantilly, VA.

Responsibilities include, but are not limited to:

  • Serve as a recognized professional authority in one engineering discipline or specialty area.

  • Conduct design studies, prepare and present findings to team and stakeholders. 

  • Contribute to systems philosophy and design objectives. 

  • Analyze and resolve issues with the architecture and resolve security and capability gaps. 

  • Assure continuity of design features from concept to implementation. 

  • Research new technologies for possible inclusion into the reference architecture that includes leading an analysis of alternatives, developing use cases and presenting findings.

  • Work closely with security professionals to achieve and maintain security requirements.

  • Need to ensure system design is properly documented and assist with technology transfer of the solution to the implementers.

  • Demonstrate the ability to make decisions independently, resolve important questions, plan and coordinate work.

  • Provide SME input to the customer and PM in support project.

  • Support technology evaluations, participation at meetings, coordination with related Government and performer organizations, program planning, background research, meeting preparation, and presentation production.

  • Provide inputs to the PM, assisting in responses to internal/external inquiries related to the project.

  • Act as the SME in areas that are not primarily within their technical domain but are pertinent to the new concepts/initiatives the project may be pursuing.

  • Participate in technical reviews of these activities, and assistance with technical evaluation and independent assessments of the concepts and related technologies.

  • Prepare briefings, reports, and other related documentation/data to support the development and approval of these activities. 

  • Present at technical exchange meetings, conferences and training sessions.

Basic Qualifications:

  • BS Degree or higher in Computer Science or similar Engineering discipline

  • 10+ years for experience

  • Extensive experience with MS Office, Excel, Word, Visio, and PowerPoint  

  • Strong written and oral communication skills, detail oriented, strong organizational skills

  • Proven ability to multi-task and prioritize responsibilities

  • Excellent attention to details and diligent adherence to deadlines and deliverables

  • A high-level performer with the ability to be proactive and respond rapidly to changing conditions in a fast-paced environment

  • Strong organizational skills

  • Experience with providing analysis and support to science and technology or advance research and development programs preferred

  • Must possess DoD 8570 IAT-II certification

  • Must possess DoD 8570 computing environment certification

  • Experience with Agile Scrum Methodology

Security Requirements: 

Must possess an active TS clearance with ability to obtain a Counterintelligence (CI) Polygraph.

Physical Requirements:

  • Must be able to remain in a stationary position 50%.

  • Needs to occasionally move about inside the office to access file cabinets, office machinery, etc.

  • Constantly operates a computer and other office productivity machinery, such as a calculator, copy machine and computer printer.

  • Often positions self to maintain computers in the lab, including under the desks and in the server closet.

  • Frequently communicates with co-workers, management and customers, which may involve delivering presentations. Must be able to exchange accurate information in these situations.

  • May be asked to move Audio/Visual or Computer equipment.

For all positions requiring access to technology/software source code that is subject to export control laws, employment with the company is contingent on either verifying U.S.-person status or obtaining any necessary license. The applicant will be required to answer certain questions for export control purposes, and that information will be reviewed by compliance personnel to ensure compliance with federal law. ManTech may choose not to apply for a license for such individuals whose access to export-controlled technology or software source code may require authorization and may decline to proceed with an applicant on that basis alone.

ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment because of race, color, sex, religion, age, sexual orientation, gender identity and expression, national origin, marital status, physical or mental disability, status as a Disabled Veteran, Recently Separated Veteran, Active Duty Wartime or Campaign Badge Veteran, Armed Forces Services Medal, or any other characteristic protected by law.

If you require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please contact ManTech's Corporate EEO Department at (703) 218-6000. ManTech is an affirmative action/equal opportunity employer - minorities, females, disabled and protected veterans are urged to apply. ManTech's utilization of any external recruitment or job placement agency is predicated upon its full compliance with our equal opportunity/affirmative action policies. ManTech does not accept resumes from unsolicited recruiting firms. We pay no fees for unsolicited services.

If you are a qualified individual with a disability or a disabled veteran, you have the right to request an accommodation if you are unable or limited in your ability to use or access as a result of your disability. To request an accommodation please click and provide your name and contact information.