Senior FreeCAD Mechanical CAD Reviewer

About OpenTrain

OpenTrain is the #1 platform for finding and building careers in AI training and data labeling. We help freelancers discover specialized AI-training projects, build a unified portfolio of work, and grow a durable career teaching AI — all from one place.

About AI training and data-labeling work

AI training (also called data labeling or human feedback work) is the human side of building modern AI systems. Contributors annotate, evaluate, and validate examples that models learn from — work that is often remote, flexible, and accessible to people with domain skills such as engineering, languages, or design.

This project centers on CAD modeling and engineering QA: your work will directly influence how technical models and downstream systems are validated and interpreted.

The role

OpenTrain is hiring a Senior FreeCAD Mechanical CAD Reviewer to support a contract project focused on parametric CAD modeling, assembly design, technical drawings, and engineering quality assurance. This is a remote, part-time contractor role requiring 20+ hours per week and is open worldwide.

Compensation is hourly in USD with a posted range of $30–$100 per hour (up to $100/hr). Work will involve hands-on modeling in FreeCAD (or equivalent parametric tools), reviewing CAD outputs for manufacturability, and using Python scripting where appropriate to automate CAD tasks.

• Employment type: Contractor, Part-time
• Time requirement: 20+ hours/week
• Pay: $30–$100 USD per hour (hourly rate up to $100/hr)
• Location: Remote, worldwide
• Languages: English required

What you'll do

You will create, modify, validate, and review parametric FreeCAD models and assemblies to ensure accuracy, manufacturability, and production readiness. Expect hands-on CAD work plus documentation and feedback aimed at improving designs and processes.

• Build and validate detailed parametric CAD models in FreeCAD.
• Develop and optimize mechanical assemblies ensuring proper component integration.
• Apply GD&T and DFM practices to improve manufacturability and quality.
• Produce technical drawings and manufacturing documentation for downstream use.
• Review models and drawings for issues, completeness, and production readiness.
• Provide constructive feedback on design intent, accuracy, and process improvements.
• Use Python scripting to automate repetitive CAD workflows and streamline modeling tasks.

Requirements

Candidates must meet the stated technical requirements and be able to work independently and communicate clearly in a remote project environment. All substantive requirements below come from the project brief.

• 2+ years in mechanical engineering, product design, or industrial engineering with parametric CAD experience.
• Advanced FreeCAD experience or equivalent parametric CAD platform experience.
• Proven experience building robust, reusable parametric models.
• Strong working knowledge of GD&T and DFM principles.
• Experience producing technical drawings and manufacturing documentation.
• Experience performing engineering QA on CAD models and judging production readiness.
• Python scripting experience for CAD automation is highly advantageous.
• Strong analytical, problem-solving, and communication skills for remote collaboration.

Who should apply

Apply if you are comfortable delivering precise, production-ready CAD models and documentation and if you enjoy improving manufacturability through design review and automation. This role suits engineers who want flexible, part-time remote work that contributes directly to how technical models are evaluated and used.