Principal Mechanical Engineer (Engineer Mechanical 6) - 25317
First seen by Alion on Oct 11, 2026.
Requisition Number:25317
Required Travel: 0 - 10%
Employment Type:Full Time/Salaried/Exempt
Anticipated Salary Range:$160115.00-$240000.00
Security Clearance:TS/SCI
Level of Experience:Senior
This opportunity resides with Warfare Systems (WS) a business group within HIIs Mission Technologies division. Warfare Systems comprises cyber and mission IT; electronic warfare; and C5ISR systems.
HII works within our nations intelligence and cyber operations communities to defend our interests in cyberspace and anticipate emerging threats. Our capabilities in cybersecurity network architecture reverse engineering software and hardware development uniquely enable us to support sensitive missions for the U.S. military and federal agency partners.
Meet HIIs Mission Technologies Division
Our team of more than 7000 professionals worldwide delivers all-domain expertise and advanced technologies in service of mission partners across the globe. Mission Technologies is leading the next evolution of national defense the data evolution - by accelerating a breadth of national security solutions for government and commercial customers. Our capabilities range from C5ISR AI and Big Data cyber operations and synthetic training environments to fleet sustainment environmental remediation and the largest family of unmanned underwater vehicles in every class. Find the role thats right for you. Apply today. We look forward to meeting you.
To learn more about Mission Technologies click here for a short video: Description
Are you a technical powerhouse ready to lead the charge on next-generation defense and security solutions Do you thrive on solving complex multi-disciplinary problems that have a direct impact on national security
Mission Technologies a division of HII is seeking a Principal Mechanical Engineer to join our team of innovators in Alexandria VA. Were looking for a seasoned expert with creative mind diverse fabrication skillsets and expertise based on a deep understanding of customer mission priorities.
As a Principal Mechanical Engineer you will serve as a chief technical expert for a broad range of mission critical projects. Youll be a go-to expert for multifaceted engineering challenges from concept development and system architecture to detailed design analysis and testing. This is a hands-on impactful role where youll guide and mentor talented junior engineers while providing the strategic vision for your projects. You wont just be an engineer; youll be an architect of solutions that enable strategic missions.
Essential Job ResponsibilitiesResearches plans designs verifies validates and develops mechanical and/or electromechanical products and systems such as metals instruments controls plastics robots engines machines and mechanical resonance hydraulic or heat transfer systems for production transmission measurement and use of energy. Recommends various technology options or approaches for system processes facility or program improvements in terms of safety performance efficiency or costs. May be responsible for the transfer from R and D to manufacturing.
Lead the design and development of complex mechanical systems and subsystems for defense and security applications.
Serve as the primary technical lead for multiple projects ensuring all designs meet rigorous performance safety and reliability standards.
- Conduct advanced thermal structural and kinematic analysis to validate product requirements.
Mentor and provide technical guidance to junior mechanical engineers fostering a culture of innovation and excellence.
Collaborate with cross-functional teams including electrical engineers software developers and program managers to integrate complex systems.
- Drive the entire product lifecycle from initial concept and prototyping to manufacturing and field support.
Contribute to business development activities by providing technical expertise for proposals and new program initiatives.
- 20 years relevant experience with Bachelors in related field; 18 years relevant experience with Masters in related field; or 15 years relevant experience with PhD or Juris Doctorate in related field.
Proven experience as a technical lead on complex multi-disciplinary projects.
Expertise in CAD software and FEA/CFD analysis tools.
Strong knowledge of materials science manufacturing processes and GD&T (Geometric Dimensioning and Tolerancing).
- Existing network professional engineers and client representatives within or adjacent to HII-Mission Technologies Intelligence Community customer base
- An active TS/SCI clearance with Poly
Exposure to fumes and irritants normally encountered in an industrial environment. May involve gathering data while observing rotating or operating machinery electrical or electronic equipment with high voltages present.
The listed salary range for this role is intended as a good faith estimate based on the roles location expectations and responsibilities. When extending an offer HIIs Mission Technologies division takes a variety of factors into consideration which include but are not limited to the roles function and a candidates education or training work experience and key skills.
Together we are working to ensure a future where everyone can be free and thrive.
All qualified applicants will receive consideration for employment without regard to race color religion gender gender identity or expression sexual orientation national origin physical or mental disability age or veteran status or any other basis protected by federal state or local law.
Do You Need Assistance
If you need a reasonable accommodation for any part of the employment process please send an e-mail to and let us know the nature of your request and your contact information. Reasonable accommodations are considered on a case-by-case basis. Please note that only those inquiries concerning a request for reasonable accommodation will be responded to from this email address. Additionally you may also call 1- for assistance. Press #3 for HII Mission Technologies.
Required Experience:
Staff IC