Mechanical Engineer, Rapid Prototyping

HireArt; San Francisco (CA); On-site; USD 90,000 - 130,000; Full time

Job summary

HireArt is seeking a Mechanical Engineer, Rapid Prototyping in San Francisco, CA to turn ideas into physical hardware quickly. You will spin up 3D printed parts, CNC'd components, and other rapid-build methods to accelerate learning and decision-making.

The ideal candidate excels at CAD, thinks in tolerances for manufacturability from sketch to build, and thrives when a design is built within days rather than months.

Qualifications

• Strong CAD skills and ability to model complex parts quickly.
• Hands-on experience with 3D printing and CNC machining.
• Track record of fast prototyping cycles; bring concepts to physical hardware quickly.
• Knowledge of materials selection for prototyping vs production.
• Comfort in a lab/shop environment and hands-on building approach.
• Knowledge of GD&T and tolerances is a plus.

Responsibilities

• Design mechanical parts and assemblies in CAD, moving quickly from concept sketch to a build-ready file.
• Partner with the lab manager to plan rapid prototyping spins—3D printing, CNC machining, laser cutting, and other quick-turn methods.
• Choose fastest path to a testable prototype with appropriate material and fidelity.
• Design for manufacturability and printability/machinability from the outset.
• Build, assemble, and bench-test prototypes; be hands-on in the lab/shop.
• Run multiple concurrent design threads and adjust priorities based on test results.
• Maintain lightweight documentation (revisions, BOMs, test notes) for traceability.
• Collaborate with electrical, firmware, and product teams to incorporate constraints.

Skills

CAD

3D printing

CNC machining

DFM

Design iteration

Education

Bachelor's degree in Mechanical Engineering

Tools

SolidWorks

Fusion 360

Onshape

Job description

HireArt is helping our client find a Mechanical Engineer, Rapid Prototyping to partner closely with the lab manager to turn ideas into physical hardware fast, spinning up 3D printed parts, CNC'd components, and quick-turn development builds so the team can learn from real prototypes instead of waiting on renderings.

You won't be optimizing a single part for months—in this role, you'll be running many fast iterations across multiple concepts, making calls quickly, and getting hardware into people's hands so the team can decide what's working.

The ideal candidate is someone who is genuinely excellent at CAD, thinks in tolerances and manufacturability from the first sketch, and gets restless if a design sits unbuilt for more than a day.

What you'll do:

• Design mechanical parts and assemblies in CAD, moving quickly from concept sketch to a build-ready file.


• Partner day-to-day with the lab manager to plan and execute rapid prototyping spins—3D printing (FDM/SLA/SLS), CNC machining, laser cutting, and other quick-turn development materials and processes.


• Choose the fastest path to a testable prototype: right process, right material, right fidelity for the question being answered.


• Design for manufacturability and printability/machinability from the outset, catching issues before they cost a build cycle.


• Build, assemble, and bench-test prototypes yourself; you're comfortable in the lab/shop, not just at a workstation.


• Run multiple concurrent design threads and re-prioritize as test results come in.


• Keep tight, lightweight documentation (revisions, BOMs, test notes) so iteration speed doesn't come at the cost of traceability.


• Work closely with electrical, firmware, and product teammates to fold their constraints into the next spin.

Requirements

• Strong, demonstrable CAD skills (SolidWorks, Fusion 360, Onshape, or similar); can model complex parts and assemblies quickly and cleanly


• Hands-on experience with 3D printing and CNC machining, including practical knowledge of what each process can and can't do well


• A track record of fast prototyping cycles; you can point to projects where you took a concept to physical hardware in days, not months


• Working knowledge of materials selection (plastics, metals, common development stock) for prototyping vs. production intent


• Comfort in a physical lab/shop environment; you want to be at the machine, not just reviewing output from one


• Strong instincts for design for manufacturability (DFM) and design for assembly (DFA)

Highly Preferred Qualifications

• Experience with additional fabrication methods (laser cutting, sheet metal, vacuum forming, urethane casting)


• Basic GD&T and tolerance-stack fluency


• Prior experience in a startup, robotics, hardware R&D, or similar fast-iteration environment


• Familiarity with PDM/version control for CAD files

Commitment

This is a full-time, 6-month contract position staffed via HireArt. The role is onsite and available to candidates local to the San Francisco, CA area.

HireArt values diversity and is an Equal Opportunity Employer.

We are interested in every qualified candidate who is eligible to work in the United States.

Unfortunately, we are not able to sponsor visas or employ corp-to-corp.