Fluid Mechanics

Impulse Space

Redondo Beach

You will design and analyze spacecraft propulsion fluid systems from the ground up, leading technical development for critical propulsion components. This role suits engineers with deep expertise in fluid mechanics and spacecraft systems who want to own complex hardware designs.

Listed on Impulse Space’s careers site · Apply there ↗

Axiom Space

Full-time · Houston, TX

This role develops and delivers thermal control systems for commercial space stations, managing the complete lifecycle from design through on-orbit operation. It suits experienced thermal engineers with deep knowledge of heat transfer, fluid mechanics, and spacecraft environments who want to own critical hardware for a crewed orbital facility.

Listed on Axiom Space’s careers site · Apply there ↗

Relativity Space

Long Beach, CA · $104,000 – $156,000

This role involves analyzing and validating the structural integrity of rocket engine combustion chambers throughout development, using both hand calculations and finite element modeling to ensure the hardware meets performance and safety requirements. It suits engineers with 2+ years of structural analysis experience who want to contribute directly to a real rocket program in its active development phase.

Listed on Relativity Space’s careers site · Apply there ↗

Shield AI

Full-time · Seattle, WA · $250,000 – $370,000

Shield AI seeks an experienced fluid and thermal systems engineer to lead the design and optimization of cooling and propulsion systems for autonomous aircraft and ground robots used in defense operations. This role suits someone who combines deep technical expertise in thermal and fluid mechanics with the leadership skills to guide cross-functional teams through complex engineering challenges.

Listed on Shield AI’s careers site · Apply there ↗

Relativity Space

Full-time · Cape Canaveral, FL · $124,000 – $170,500

This role involves designing and managing the propellant and fluid systems for a commercial rocket's launch pad and ground support infrastructure. You'll work on everything from system design and stress analysis through construction, activation, and operational support at Cape Canaveral—ideal for an engineer who wants hands-on responsibility for critical launch hardware.

Listed on Relativity Space’s careers site · Apply there ↗

Relativity Space

Full-time · Long Beach, CA · $160,000 – $240,000

Lead the propulsion engineering team developing rocket engines for Relativity's Terran R vehicle, taking ownership of engine system architecture, interfaces, and requirements while mentoring engineers through design, testing, and qualification. This role suits experienced rocket propulsion engineers ready to move into technical leadership at a high-growth aerospace startup where you'll contribute directly to engine development alongside people leadership.

Listed on Relativity Space’s careers site · Apply there ↗

Relativity Space

Full-time · Long Beach, CA · $164,000 – $246,000

This role involves developing engine systems and architecture for Relativity's Terran R rocket, with responsibility for design trades, interface management, and system development from concept through qualification. It's suited to experienced propulsion engineers who can lead collaborative technical projects with deep expertise in liquid-rocket systems and who thrive in a fast-moving startup environment.

Listed on Relativity Space’s careers site · Apply there ↗

Relativity Space

Long Beach, CA · $132,000 – $198,000

This role involves leading engine system architecture and interface optimization for Relativity's Terran R rocket, spanning design trades, requirement negotiation, and development support. It suits experienced propulsion engineers who thrive as self-directed technical leaders on ambitious, fast-moving projects.

Listed on Relativity Space’s careers site · Apply there ↗

Relativity Space

Full-time · Long Beach, CA · $185,000 – $277,000

Lead the architecture and system-level design of advanced liquid-propellant rocket engines at a commercial spaceflight company developing a production orbital launch vehicle. This role suits experienced propulsion engineers who can drive technical trades across engine systems, manage cross-functional interfaces, and mentor teams while contributing deep technical expertise to solve novel challenges.

Listed on Relativity Space’s careers site · Apply there ↗