Principal Engineer, Fluid & Thermal Systems (R4793)
- Salary
- USD 250,000 - 370,000 / per-year-salary
- Level
- Principal
- Work type
- On-site · Seattle
Not stated in the posting: visa.
Open. First seen 22 October 2026.
About the role
Shield AI's standard text
Shield AI is a venture-backed defense-tech company with the mission of protecting service members and civilians with intelligent systems. Its products include Hivemind autonomy software, V-BAT and X-BAT aircraft, and Aechelon simulation and synthetic reality technologies. With offices and facilities across the U.S., Europe, the Middle East, and Asia-Pacific, Shield AI’s technology actively supports operations worldwide. For more information, visit www.shield.ai. Follow Shield AI on LinkedIn, X, Instagram, and YouTube.
Job Description:
Are you an experienced and innovative Fluid & Thermal Systems Engineer looking to help shape the future of AI and robotics technology? Are you eager to make a meaningful impact on cutting-edge products that matter? Do you thrive in a fast-paced, mission-driven environment alongside highly motivated and values-focused teammates? Shield AI is the perfect place for you!
As a Staff Fluid & Thermal Systems Engineer at Shield AI, you will lead the design, development, and optimization of fluid and thermal systems for our advanced autonomous UAVs and ground systems. Your expertise fluid & thermal system design will drive innovation, prototyping, testing, and the successful integration of solutions that operate reliably in challenging environments. This role requires technical leadership, collaboration with cross-functional teams, and an unwavering commitment to delivering excellence from concept to production.
What you'll do:
- Own design and analysis of fluid and thermal systems for aircraft and ground platforms.
- Develop and implement innovative thermal solutions
- Use first-principles engineering to drive design decisions to yield optimal solutions
- Research technologies for integration into complex solutions
- Conduct advanced simulations to predict system performance and refine designs
- Execute testing and validation efforts, including data acquisition, post-processing, and verification against requirements
- Collaborate with cross-disciplinary teams to integrate fluid and thermal system designs into larger system architectures.
- Mentor and guide junior engineers, fostering technical growth and excellence within the team.
- Identify suppliers and build successful supplier management relationships for procurement of components or systems for fluid and thermal system designs
- Other duties as assigned
Required qualifications:
- Minimum 10+ years of experience in Fluid or Thermal System design, with a proven track record of technical excellence.
- B.S. or advanced degree in Mechanical, Aerospace, or related Engineering discipline.
- Deep understanding of heat transfer, fluid dynamics, thermodynamics, and system-level thermal management.
- Experience implementing system models in commercial tools, such as MATLAB Simscape, Amesim, etc.
- Experience developing custom engineering models in Excel and in languages such as MATLAB, Python, etc.
- Experience in fluid and thermal system testing, including sensor integration, data acquisition, and analysis.
- Expertise in 3D CAD modeling tools such as Siemens NX or equivalent.
- Demonstrated ability to execute projects with minimal oversight, assume full ownership, and deliver exceptional outcomes.
- Excellence in supplier management, COTS component sourcing, optimization/trade studies
- Proven success in dynamic, fast-paced environments.
- Ability to obtain a S//SAR level security clearance desired.
Preferred qualifications:
- Extensive experience with fluid & thermal system design, analysis, manufacture and test for aircraft
- Familiarity with fluid and thermal system effects on aircraft performance
- Familiarity with startup or R&D environments, demonstrating adaptability and agility under pressure.
- Strong knowledge of environmental standards and certification processes for aerospace or defense systems.
- A passion for innovation and the ability to push boundaries in fluid & thermal system development.
#LI-MS1
#LF
Full-time regular employee offer package:
Pay within range listed + Bonus + Benefits + Equity
Temporary employee offer package:
Pay within range listed above + temporary benefits package (applicable after 60 days of employment)
Salary compensation is influenced by a wide array of factors including but not limited to skill set, level of experience, licenses and certifications, and specific work location. All offers are contingent on a cleared background and possible reference check. Military fellows and part-time employees are not eligible for benefits. Please speak to your talent acquisition representative for more information.
Shield AI's standard text
###
Shield AI is proud to be an equal opportunity workplace and is an affirmative action employer. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, marital status, disability, gender identity or Veteran status. If you have a disability or special need that requires accommodation, please let us know.
What this role asks for
Standard for software engineering roles
Python
Common in software engineering postings at any company.
81% of this description is written for the role. The rest is Shield AI's standard text, folded away below.
Compared with Shield AI's other open jobs.
The team: X-BAT Engineering - Mechanical HIRES STEADILY
This role is one of 31 open in X-BAT Engineering - Mechanical. 14 were posted in the last 30 days and the oldest in November: a team that hires all year rather than one being built.
WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS
FEA (12 of 31), CATIA (9 of 31), GD&T (9 of 31), Siemens NX (8 of 31), SolidWorks (8 of 31), Python (6 of 31), ANSYS (5 of 31)
OTHER ROLES ON THIS TEAM
- Staff Engineer, Aircraft Thermal Systems - Ranger (R6351) posted Oct 20
- Senior Staff Engineer, Environmental Control Systems - Ranger (R6350) posted Oct 20
- Staff Engineer, Actuated Systems - Ranger (R6347) posted Oct 19
- Senior Staff Engineer, Flight Control Actuation Systems - Ranger (R6327) posted Oct 18
- Senior Staff Engineer, Mechanical & Actuated Systems (R6307) posted Oct 18
- Manager, Environmental Control Systems & Thermal Engineering (R6306) posted Oct 18
- Engineer I, Mechanical (R6302) - New Grad posted Oct 17
- Staff Technician, Mechanical Test posted Oct 16
- EWIS Harness Design - Engineer I posted Oct 16
- Staff Engineer, Landing Gear Systems - Ranger (R6294) posted Oct 15
- Principal Thermal Engineer - Aircraft Avionics & Thermal Systems (R3930) posted Oct 13
- Engineer II, Avionics Thermal Engineering (R5298) posted Oct 13
- Technician II, Mechanical Test (R6165) posted Oct 3
- Staff Engineer, Electromechanical (R6043) posted Sep 23
- Staff Technical Program Manager, Air Vehicle Systems (R6044) posted Sep 22
- Principal Engineer, Fluid & Thermal Systems (R5620) posted Sep 11
- Engineering Manager, Air Vehicle Mechanical Systems (R5391) posted Aug 18
- Staff Engineer, Mechanical Test (R5475) posted Aug 3
- Staff Engineer, Mechanical & Actuated Systems (R5293) posted Jul 30
- Senior Engineer, Avionics Thermal Engineering (R5298) posted Jul 9
- Senior Vibrations Test Engineer (R5091) posted Jun 30
- Senior Engineer, Air Vehicle Fluid Systems (R5203) posted Jun 17
- Senior Manager, Mechanical Engineering - Avionics (R4416) posted Jun 12
- Staff Technician, Air Vehicle Systems (R4892) posted Apr 29
- Senior Engineer, Air Vehicle Fluid Systems (R4891) posted Apr 29
- Senior Engineer, Mechanisms (R4890) posted Apr 29
- Staff Engineer, Mechanical - Harness Design (R4594) posted Mar 25
- Senior Staff Engineer, Electromechanical (R4583) posted Mar 25
- Senior Staff Engineer, Mechanical Test (R4413) posted Jan 15
- Sr. Staff Thermal Engineer - Aircraft Avionics & Thermal Systems (R3930) posted Nov 14
From the team and dates on Shield AI's own job board.
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