Custom Contractor Agreement for Fabrication

I need a clear, legally enforceable independent-contractor agreement for a metal-fabrication, welding, and product-design specialist my company is bringing on. The document must prioritise liability protection while also shielding our proprietary designs and market position... (Budget: $250 - $750 USD, Jobs: CAD/CAM, Contracts, Drafting, Legal, Patents, Product Design, Welding)