Lead Mechanical Engineer, Airframe

Poseidon Aerospace; Berkeley (CA); On-site; USD 140,000 - 190,000; Full time

Benefits offered by this job

Equity stake

Relocation support

Health benefits

Flexible PTO

Free lunches and snacks

Job summary

Poseidon Aerospace is designing and operating autonomous cargo aircraft capable of two tons over 1000 nautical miles. The Lead Mechanical Engineer will own major assemblies from concept to flight testing, set technical direction, and lead design reviews. Hands-on work spans CAD, analysis, manufacturing, assembly, and testing.

The role requires leading interfaces between airframe, propulsion, avionics, and land systems, and mentoring engineers while coordinating with manufacturing and QA.

Qualifications

• Degree in Mechanical or Aerospace Engineering or related field.
• 7+ years in mechanical/aerospace engineering.
• Experience designing primary aircraft structures or large composite airframes.
• Experience with bonded composites and hybrid assemblies.
• Experience with aircraft mechanisms and deployable systems.
• Proficiency with CAD and FEA tools listed.

Responsibilities

• Lead design of primary aircraft structures and major airframe assemblies.
• Develop composite and metallic structures, joints, and mounting systems.
• Define load paths, requirements, margins, and validation methods.
• Perform hand calculations and FEA, review results.
• Own CAD assemblies, drawings, BOMs, tolerances, and design releases.
• Mentor engineers and lead design reviews.
• Support aircraft assembly, testing, and repairs.

Skills

CAD proficiency

FEA analysis

Structural design

Design reviews

GD&T and tolerancing

Cross-functional leadership

Prototype and testing

Manufacturing liaison

Problem solving

Education

Bachelor's in Mechanical or Aerospace Engineering

Tools

Fusion

SolidWorks

CATIA

NX

Creo

ANSYS

Nastran

Abaqus

Job description

About Poseidon Aerospace

Poseidon Aerospace is reimagining how the world moves goods. We build and operate full-size autonomous cargo aircraft—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 the San Francisco Bay Area with locations in Washington DC, Oregon, and Maine; we're building something consequential.

About The Role

The Lead Mechanical Engineer will own the structural and mechanical design of major aircraft assemblies from concept through flight testing. This role is responsible for setting technical direction, leading design reviews, managing subsystem interfaces, and supporting other mechanical engineers. It is a hands-on engineering position that requires detailed involvement in CAD, analysis, manufacturing, assembly, and testing.

Responsibilities

• Lead the design of primary aircraft structures, mechanisms, and major airframe assemblies
• Develop composite and metallic structures, joints, interfaces, and mounting systems
• Define structural load paths, design requirements, margins, and validation methods
• Perform and review hand calculations and finite element analysis
• Evaluate strength, stiffness, buckling, fatigue, vibration, and composite failure modes
• Lead preliminary and critical design reviews
• Own CAD assemblies, production drawings, bills of materials, tolerances, and design releases
• Manage mechanical interfaces between the airframe, propulsion, avionics, flight controls, landing systems, and other subsystems
• Design aircraft mechanisms, including control surfaces, doors, landing gear, actuation systems, and deployable systems
• Work with manufacturing to develop tooling, assembly processes, inspection methods, and repair procedures
• Plan and support component, structural, subsystem, and vehicle-level testing
• Investigate failures, determine root causes, and implement corrective actions
• Mentor mechanical engineers and review their design and analysis work
• Support aircraft assembly, integration, ground testing, and flight testing

Required Qualifications

• Degree in Mechanical Engineering, Aerospace Engineering, or a related field
• 7 or more years of relevant mechanical, structural, or aerospace engineering experience
• Experience designing primary aircraft structures or large composite airframes
• Experience with bonded composite structures, sandwich panels, bonded inserts, and hybrid composite-metallic assemblies
• Experience with aircraft mechanisms, actuation systems, control surfaces, doors, landing gear, or deployable systems
• Knowledge of composite failure criteria, buckling, fatigue, vibration, modal analysis, or damage tolerance
• Experience taking safety-critical hardware from concept through manufacturing and testing
• Strong proficiency with CAD software such as Fusion, SolidWorks, CATIA, NX, or Creo
• Strong proficiency with finite element analysis tools such as ANSYS, Nastran, Abaqus, Fusion Simulation, or similar
• Ability to verify analysis using hand calculations and first-principles methods
• Strong understanding of structural mechanics, load paths, joint design, material behavior, and mechanical failure modes
• Experience applying GD&T and mechanical tolerancing to production drawings
• Experience designing for manufacturing, assembly, inspection, maintenance, and repair
• Experience leading technical reviews and making design decisions across multiple engineering teams
• Comfortable working directly with aircraft hardware, prototypes, test fixtures, and shop tools

Preferred Qualifications

• Experience designing structures for marine environments
• Experience developing structural test plans, fixtures, instrumentation, and acceptance criteria
• Familiarity with FAA certification, military airworthiness, or experimental flight-test programs
• Proficiency with MATLAB or Python for engineering analysis
• Experience with product lifecycle management and configuration control systems

Candidates who are not yet qualified for a Lead position may apply to our Mechanical Engineer openings.

What You Get From Us

• Competitive salary and meaningful early-stage equity
• Relocation support if applicable
• Employee Health Benefit Plans
• 6% Retirement matching
• Flexible PTO
• Free lunches, snacks, and a stocked fridge at our offices
• AI tools and subscriptions