Senior Mechanical Integration Engineer

Relativity Space•Long Beach, CA

About The Position

Relativity Space is building rockets to serve today’s needs and tomorrow’s breakthroughs. The Terran R vehicle will deliver customer payloads to orbit, meeting the growing demand for launch capacity. Achieving commercial success with Terran R will unlock new opportunities to advance science, exploration, and innovation, pioneering progress that reaches beyond the known. Joining Relativity means becoming part of something where autonomy, ownership, and impact exist at every level. Engineers solve problems that haven’t been solved before, helping develop a rocket, a factory, and a business from the ground up. Collaboration across teams, shaping decisions, and seeing work come to life in record time are key aspects of the role. Creativity and technical rigor go hand in hand, and your voice will help define the stories being written together. This is a unique moment in time to leave your mark on the product, the process, and the culture, with Terran R being tangible and gaining momentum. The most meaningful work of your career is waiting. The Avionics team is responsible for the full lifecycle of Terran R’s nervous system, designing, building, testing, installing, and operating the hardware that connects and controls every major electrical system on the vehicle and ground. The team leverages close partnership between avionics design, manufacturing, and test to enable rapid iteration and feedback loops. Engineers are deeply embedded into other functions within Relativity, working closely with propulsion, GNC, fluids, and stage engineering teams to ensure seamless integration and operation. This role offers the opportunity to help shape Terran R's fundamental avionics architecture and be given a high degree of ownership on components that will fly.

Requirements

Minimum of 5 years of experience in full-cycle mechanical or structural design engineering roles, including experience taking hardware from concept through flight or production.
Bachelor's degree in Mechanical Engineering, Aerospace Engineering, or related field.
Experience with 3D computer aided design (CAD) software.
Strong background in structural and thermal analysis, including finite element analysis methods.
Demonstrated project ownership and accountability on complex, multi-disciplinary technical projects, with a track record of delivering under schedule pressure.

Responsibilities

Own mechanical/structural design, packaging, analysis, test, and validation of secondary structure within the Terran R Avionics system. Secondary structure includes trays, brackets, dynamic isolation, thermal management, and environmental protection components.
Provide technical direction across the secondary structure portfolio — set design standards, review and approve analysis and drawings, and make architecture-level trade decisions that balance mission requirements, producibility, schedule, and cost.
Drive cross-functional integration with Avionics, Fluids, Dynamics, Thermal, Structures, and Vehicle Integration teams, serving as the primary point of accountability for your secondary structure delivery and interfaces.
Perform modal, structural, and thermal analysis of hardware to static, dynamic, and thermal environments, and ensure analysis rigor and design margins are appropriate for flight.