Mechanical Engineer

ABOUT POSEIDON AEROSPACE: Poseidon Aerospace is reimagining how the world moves goods. We build and operate full-size autonomous cargo aircraft; Heron, a seaplane, and Egret, a STOL aircraft; each capable of carrying two tons of payload over a thousand nautical miles. From remote communities to contested logistics operations, our platforms unlock a new cost curve for air freight, making it faster, cheaper, and accessible anywhere it's needed. Headquartered in San Francisco with offices in Washington, DC and Maine, we're a small team building something consequential. We encourage candidates without at least a year of full-time, post graduation work experience to apply to our Mechanical Engineer (New Graduate) job posting As a Mechanical Engineer at Poseidon Aerospace, you will design the structural and mechanical systems that make our composite aircraft functional and manufacturable. You will work across CAD design, mechanism development, and finite element analysis to create reliable, lightweight structures suited for flight and marine environments. This role is both analytical and hands-on, involving close collaboration with manufacturing, aerodynamics, and test teams to bring designs from concept to flight hardware. Responsibilities: - Design and develop aircraft structures, mechanisms, and tooling using CAD software - Perform FEA to validate strength, stiffness, and load paths in composite and metallic components - Create detailed part/assembly drawings and documentation for manufacturing and inspection - Design linkages, control surface mechanisms, and mounting systems for aircraft subsystems - Collaborate with manufacturing engineers to ensure designs are practical, cost-effective, and easy to assemble - Support testing and validation of structural and mechanical systems, including fixture and rig design - Maintain CAD libraries, revision control, and configuration management for aircraft assemblies - Provide design feedback to improve manufacturability, mainta