Principal Engineer, Fluid & Thermal Systems (R5620)
Shield AI
Seattle, WA · $266k–$400k a year · Posted September 11, 2026
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Where Seattle, WA ranks
Where Seattle, WA placed in our monthly rankings, month by month. Each month stays online at its own address.
November 2026
- #1Cities with the most jobs that do not need a four-year degree in the Pacific Northwest316 jobs · of 8
- #1Best cities for software and engineering jobs in the Pacific Northwest1,776 openings · of 14
- #2Best cities for energy and utilities pay after cost of living$180k · of 18
- #2Best cities for entry-level jobs that want AI skills in the Pacific Northwest17% · of 12
- #2Best cities for AI-skill jobs in the Pacific Northwest26% · of 17
- #2Best cities for software and engineering jobs in the West Coast1,776 openings · of 60
Rankings about engineering jobs
- Best cities for software and engineering jobs #1 San Francisco (3,412 openings)
- Best cities for engineering pay after cost of living #1 San Mateo ($216k)
- Most requested AI skills in engineering jobs #1 AI tools in daily work (6.1%)
- AI tools named most often in engineering jobs #1 Claude (1.7%)
- Employers with the most engineering jobs #1 Amazon (2,992 roles)
How AI is used in this kind of work
AI use among stationary engineers and boiler operators is little observed so far. Measured exposure for stationary engineers and boiler operators: 0% (little observed).
Share of this job’s tasks that AI is already used for at work, from real usage. It is not a forecast of job loss, and a low number means no use seen yet. Source: Anthropic Economic Index.
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About the job
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 Principal 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 15+ 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.
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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.