Junior FreeCAD 3D Modeling Designer

About OpenTrain

OpenTrain is the #1 platform for finding and building careers in AI training and data labeling. We help contributors discover projects, build a unified portfolio, and grow a durable freelance career teaching AI — creating a single place to find, apply for, and manage specialist AI-training work.

We hire contractors directly through OpenTrain for projects that power AI systems. This role is contracted and managed by OpenTrain AI.

Why AI training work matters

AI models learn from high-quality examples prepared by people. Creating accurate 3D CAD models helps train and evaluate spatial reasoning, object understanding, and simulation workflows in modern AI systems.

Work in this industry is often remote and flexible, accessible to people with practical CAD or engineering skills, and gives you a direct impact on how AI systems learn to understand three-dimensional objects.

• 100% remote: work from anywhere with an internet connection.
• Flexible, part-time contractor work that fits around other commitments.
• Entry-level friendly: strong FreeCAD skills and attention to detail matter more than formal titles.

The role

OpenTrain is hiring a Junior FreeCAD 3D Modeling Designer to create and refine 3D models used in AI training workflows. You will work from detailed briefs and technical specs, iterate on designs from feedback, document your methods, and keep model files organized with version control.

This is a contractor, part-time role requiring 20+ hours/week. Compensation is hourly with a rate range of $20–$110/hr (paid in USD). The project language is English and the position is open worldwide.

• Employment type: Contractor, Part-time.
• Expected weekly time: 20+ hours.
• Pay: Hourly, USD (range $20–$110/hr).
• Location: Remote — open worldwide. English required.

What you'll do day to day

Your primary responsibility is producing reliable, geometry-accurate 3D models in FreeCAD that meet technical briefs and are suitable for AI training and evaluation tasks. You will regularly review and revise models based on feedback and document your workflows so others can replicate or extend them.

You will also keep project files organized and use version control practices so models and iterations remain traceable and reproducible.

• Create and refine 3D models in FreeCAD from technical briefs.
• Interpret design specifications and deliver geometrically accurate parts and assemblies.
• Revise models based on review notes and improve usability for AI purposes.
• Document modeling workflows, assumptions, and version history.
• Maintain organized files and version control for all modeling work.
• Communicate clearly about requirements, constraints, and expected outcomes.

Requirements

The role is entry level but requires hands-on proficiency with FreeCAD and a careful, detail-oriented approach to geometry. Clear written and verbal communication is required to collaborate remotely and document work.

You must be able to follow technical instructions, adapt to changing project needs, and demonstrate an understanding of basic engineering or design principles.

• Proficiency in FreeCAD for 3D modeling and design tasks.
• Ability to interpret technical specifications and design briefs accurately.
• Strong attention to geometrical accuracy and model usability.
• Effective written and verbal communication skills in English.
• Understanding of basic engineering or design principles.

Helpful background

Candidates with experience in mechanical engineering, industrial design, or related technical fields will find this work familiar. Prior involvement with AI/ML projects or dataset creation is a plus but not required.

A proactive attitude and willingness to learn new modeling techniques that improve model quality for AI workflows will help you succeed and grow in this role.

• Background in mechanical engineering, industrial design, or similar technical experience.
• Previous experience working with datasets, AI, or ML-related projects is helpful.
• Comfort learning and documenting new techniques relevant to AI training.

How to apply

Create a free OpenTrain account to apply. This role is managed and contracted by OpenTrain AI — apply directly through the OpenTrain platform. Be prepared to confirm your availability for 20+ hours/week and your hourly expectations within the stated range.

Successful applicants will be asked to participate in a short technical review or provide examples of FreeCAD work during the onboarding process to demonstrate proficiency.

• Apply via your OpenTrain account (creating one is free).
• Provide availability (20+ hrs/week) and confirm hourly expectations within $20–$110/hr.
• Be ready to show samples of FreeCAD models or complete a brief skills check.