Mechanical Design Engineer (Propulsion)

K2 is building the largest and highest-power satellites ever flown, unlocking performance levels previously out of reach across every orbit. Backed by over $1 billion in total funding from leading investors including Altimeter Capital, ICONIQ, Kleiner Perkins, Lightspeed Venture Partners, Redpoint Ventures, and T. Rowe Price — and with over $1 billion in signed contracts across commercial and US government customers, we're mass-producing the highest-power satellite platforms ever built for missions from LEO to deep space. The rise of heavy-lift launch vehicles is shifting the industry from an era of mass constraint to one of mass abundance, and we believe this new era demands a fundamentally different class of spacecraft. Engineered to survive the harshest radiation environments and to fully capitalize on today's and tomorrow's massive rockets, K2 satellites deliver unmatched capability at constellation scale and across multiple orbits. With multiple launches in 2027 and plans to scale to 100 satellites a year, we're Building Bigger — helping develop the solar system and build toward a Kardashev Type II (K2) civilization. If you are a motivated individual who thrives in a fast-paced environment and you're excited about contributing to the success of a high-growth Series D-funded company, we'd love for you to apply. The Role You will own the success of mechanical structures and mechanisms used for a propulsion system that will be the highest-powered electric propulsion system ever flown and unlock new mission concepts and increase our access to deep space. As part of a small multidisciplinary team, your role will involve mechanical design, development, build, test, and analysis of the satellite’s plasma propulsion system and all related hardwar e. In your first 6 months, you will define product requirements, create initial concepts and trades, perform preliminary and detailed analysis, define development test campaigns, and produce development hardware. In your first year, you will validate your designs through prototype iterations and build and qualify flight hardware. In your first two years you will fly your hardware in space while directly supporting production and integration. Responsibilities Own the mechanical design of propulsion system hardware including propulsion modules, critical thruster components, the propellant management system, avionics box design, propulsion secondary structures, and potentially tank development Validate your designs through the entire lifecycle from concept to production, and successful flight demonstrations Generate 3D models, fully dimensioned drawings, and interface control documents Perform analysis on data from testing hardware, iterating designs, and critical go/no-go calls on hardware performance Develop and execute component and system-level test plans Manage key propulsion vendors and suppliers through hardware delivery Continually own and refine sub-system deliverable…