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Entry Level Mechanical Engineer Startup Jobs in California

Sunday Inc

Mechanical Engineer

Redwood City, CA · On-site

Strong collaboration skills and comfort working in fast-paced startup environments * Bachelor's degree in Mechanical Engineering or related field (Master's a plus, but not required) At Sunday ...

Amat

Mechanical / Systems Engineer (NCG)

Santa Clara, CA · On-site

$80K - $110K/yr

Summary Applied Materials is seeking an entry-level Mechanical/System Engineer to support equipment definition and system integration activities for 300mm platforms. This role will provide critical ...

Mach Industries

Mechanical Engineer

Huntington Beach, CA · On-site

$105K - $180K/yr

With a workforce of approximately 350 employees , we operate with startup agility and ambition. Our ... The Role Mach Industries is seeking a Mechanical Engineer to join our team in designing ...

Aurelius Systems

Mechanical Engineer

San Francisco, CA · On-site

$130K - $180K/yr

Aurelius Systems is a VC backed defense tech startup building autonomous, edge deployed directed ... We need a Mechanical Engineer focused on design ruggedization across Archimedes - survivability ...

Peregrine Team

Mechanical Engineer I

Los Angeles, CA · On-site

We are seeking a Mechanical Engineer I to support the design, development, and testing of ... This is an entry-level role ideal for engineers early in their careers looking to gain hands-on ...

Atoms

Mechanical Engineer

San Francisco, CA · On-site

What you'll do We are seeking a Mechanical Engineer to help design the physical architecture of our ... in-the-loop startup environment. Why join us At Atoms, you'll work on one of the defining ...

Atoms

Mechanical Engineer

San Francisco, CA · On-site

What you'll do We are seeking a Mechanical Engineer to help design the physical architecture of our ... in-the-loop startup environment. Why join us At Atoms, you'll work on one of the defining ...

Sentradel

Mechanical Engineer

San Francisco, CA · On-site

$105K - $170K/yr

Sentradel is a defense startup in San Francisco building autonomous, low cost kinetic turret ... Job Overview We are seeking a mechanical engineer to join the team developing Sentradel's next ...

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All JobsMechanical Engineer Startup JobsEntry Level Mechanical Engineer Startup JobsEntry Level Mechanical Engineer Startup Jobs in California

Entry Level Mechanical Engineer Startup information

What is the difference between Entry Level Mechanical Engineer Startup vs Entry Level Mechanical Engineer Corporate?

AspectEntry Level Mechanical Engineer StartupEntry Level Mechanical Engineer Corporate
Work EnvironmentFast-paced, dynamic, smaller teamsStructured, larger teams, established processes
ResponsibilitiesBroader scope, hands-on tasks, varied projectsSpecialized tasks, defined roles, routine projects
Workplace CultureFlexible, entrepreneurial, innovativeFormal, process-driven, hierarchical
Required CredentialsBachelor's in Mechanical Engineering, internship experienceBachelor's in Mechanical Engineering, internship experience

In summary, Entry Level Mechanical Engineer Startup roles typically involve a more versatile and fast-paced environment with broader responsibilities, while corporate roles offer structured processes and specialized tasks. Both require similar educational backgrounds and internships, but the work culture and scope differ significantly.

What are the most commonly searched types of Mechanical Engineer Startup jobs in California?

The most popular types of Mechanical Engineer Startup jobs in California are:

What are popular job titles related to Entry Level Mechanical Engineer Startup jobs in California?

For Entry Level Mechanical Engineer Startup jobs in California, the most frequently searched job titles are:

What job categories do people searching Entry Level Mechanical Engineer Startup jobs in California look for?

The top searched job categories for Entry Level Mechanical Engineer Startup jobs in California are:

What cities in California are hiring for Entry Level Mechanical Engineer Startup jobs?

Cities in California with the most Entry Level Mechanical Engineer Startup job openings:

Entry Level Mechanical Engineer Startup jobs near you
Infographic showing various Entry Level Mechanical Engineer Startup job openings in California as of August 2026, with employment types broken down into 92% Full Time, 6% Part Time, 1% Contract, and 1% Nights. Highlights an 97% Physical, 1% Hybrid, and 2% Remote job distribution.

Mechanical Engineer

Poseidon Aerospace

San Francisco, CA • On-site

Full-time

Medical, Retirement, PTO

Re-posted 12 days ago

Job description

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 the San Francisco Bay Area with locations in Washington DC, Oregon, and Maine; we're 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, maintainability, and structural efficiency

Ideal Qualifications:
  • Degree in Mechanical Engineering, Aerospace Engineering, or a related field
  • Proficiency with CAD software such as Fusion,, SolidWorks, CATIA, or NX
  • Strong understanding of structural design, stress analysis, and mechanical systems
  • Experience with FEA tools such as ANSYS, Fusion Simulation, Nastran, or similar
  • Ability to apply GD&T and mechanical tolerancing to production drawings
  • Familiarity with composite and metallic fabrication methods
  • Understanding of fundamentals of flight mechanics and aircraft dynamics
  • Comfortable working hands-on with prototypes, test articles, and shop tools
  • Capable of managing projects independently in a fast-paced, startup environment

Nice to Have:
  • Experience with bonded composite structures or hybrid assemblies
  • Background in actuation systems, linkages, or motion mechanisms
  • Knowledge of vibration, fatigue, or modal analysis
  • Hands-on experience with machining, additive manufacturing, or assembly tooling
  • Familiarity with design for manufacturing (DFM) and design for assembly (DFA)
  • Proficiency in MATLAB or Python for analysis and process automation
  • Exposure to aerospace certification or flight test environments
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

Even if you don't meet every qualification listed, we encourage you to apply. At Poseidon Aerospace, we value diverse perspectives and are always looking for talented individuals with unconventional backgrounds.

Apply