Mechanical Design AI Evaluation Engineer

OpenTrain AI, Inc.; Northern (KY); Hybrid; USD 55,000 - 124,000; Part time

Job summary

OpenTrain AI, Inc. seeks a remote, part-time contractor to evaluate AI systems that reason about mechanical design. You will analyze complex CAD assemblies, explain how they function, and document design intent, constraints, and critical decisions.

You will verify answers against CAD models, review AI-generated reasoning for accuracy, and propose targeted improvements. Strong English writing and hands-on CAD expertise are required.

Qualifications

• Analyze multi-part mechanical assemblies and explain how they function.
• Prepare challenging, non-obvious CAD assembly questions.
• Verify answers directly from CAD models and data.
• Review AI-generated reasoning for accuracy and completeness.
• Suggest targeted improvements and resolve unclear questions.

Responsibilities

• Analyze multi-part mechanical assemblies to explain how the design works.
• Write challenging, non-obvious technical questions about CAD assemblies.
• Verify defensible answers from CAD models.
• Review AI-generated mechanical reasoning for inaccuracies or gaps.
• Recommend improvements and refine unclear questions.

Skills

Strong English communication

Design intent

Assembly reasoning

Mechanisms

Kinematics

GD&T

Tolerance judgement

Tools

SolidWorks

Creo

NX

CATIA

Inventor

Fusion 360

Onshape

Solid Edge

Job description

The work

You will help evaluate AI systems that reason about mechanical design. The work centers on complex, multi-part CAD assemblies and requires you to explain whether technical answers are accurate, complete, and supported by the model.

You will document design intent, constraints, critical decisions, failure points, reasoning, traceability, edge cases, and areas of disagreement.

• Analyze multi-part mechanical assemblies and identify how their design works.
• Write challenging, non-obvious technical questions about CAD assemblies.
• Verify defensible answers directly from CAD models.
• Review AI-generated mechanical reasoning for inaccurate or incomplete conclusions.
• Recommend targeted improvements and refine unclear or unanswerable questions.

What it pays and takes

This is a remote, part-time contractor project for people with substantial mechanical design experience. The listing is marked entry level, but the role requires at least five years of experience creating and overseeing multi-part mechanical assemblies.

• Pay: $40-$90 per hour.
• Time: Approximately 15 hours per week, under 20 hours weekly.
• Location: Remote, with eligibility limited to the countries listed in the posting.
• Language: Strong written English communication skills.
• CAD: Mastery of at least one major parametric CAD tool, such as SolidWorks, Creo, NX, CATIA, Inventor, Fusion, Onshape, or Solid Edge.
• Technical knowledge: Design intent, assembly reasoning, mechanisms, kinematics, GD&T, and tolerance judgment.
• Professional background: Experience in industrial machinery, robotics, automotive, aerospace, medical devices, consumer products, or tooling and fixture design.
• Helpful experience: Teaching, mentoring, leading design reviews, or coaching engineering teams.

About AI training work

AI training is the human work behind systems that learn from examples, including reviewing model answers and checking technical reasoning. People with specialized experience help make those examples accurate and useful, which is why this work can draw on professional engineering knowledge.