Senior Mechanical Design Engineer (Electric Motors)

Location: San Francisco, California, United States. On-site at least 3 days per week, with availability to work on-site 5 days per week and occasional supplier travel.

Salary: $109,500–$161,000, $134,000–$197,000, or $161,800–$238,000 USD annually, plus potential equity grants.

Company

hirify.global operates a large-scale delivery platform and is developing autonomous delivery systems, including unmanned aerial vehicles and ground equipment.

What you will do

• Design and develop high-performance electric motors for UAV propulsion and other autonomous delivery hardware.
• Design mass- and volume-optimized rotor and stator structures, bearing systems, wiring, connectors, and motor sensors.
• Perform structural and thermal finite element analysis to optimize performance and reliability.
• Own motor development from concept through production while collaborating with electrical, systems, structural, aerodynamics, reliability, test, industrial design, and manufacturing partners.
• Build prototypes, fixtures, and test hardware using CNC tools, machine-shop equipment, welding tools, and 3D printers.
• Design hardware for outdoor commercial operation, including ingress protection and harsh-environment survival.

Requirements

• Bachelor’s degree in mechanical engineering and at least 3 years of experience.
• Experience with dynamic mechanical systems such as motors, actuators, or mechanisms.
• Strong 3D CAD modeling skills for complex parts and assemblies.
• Ability to independently perform basic structural and thermal simulation.
• Hands-on experience with prototyping, metal fabrication, 3D printing, assembly, and test-fixture design.
• Knowledge of electromechanical integration, wiring practices, manufacturability, assembly methods, and hardware for outdoor or harsh environments.

Nice to have

• Experience with electric motor manufacturing processes and equipment.

Culture & Benefits

• Fast-paced, exploratory, prototype-driven environment with autonomy and rapid iteration.
• Access to an in-house machine shop, additive manufacturing tools, electrical integration equipment, and testing capabilities.
• Cross-functional collaboration, mentoring, and opportunities for increasing responsibility.
• Benefits include 401(k) matching, medical, dental, and vision insurance, paid parental leave, paid time off, paid sick leave, wellness and commuter benefits, and mental health support.