Pre-launch product looking for design partners?

Hi all, I'm Liam and I work for a new startup called Blocks - https://buildblocks.com We're currently pre-launch, but we are at a stage where we want to bring on design partners to provide value while continuing to build our platform. We're looking for people who are at the "build" stage of creating a software product. Ideally it would be a b2b saas product in a domain the person is familiar with. The offer is that we will build your product FREE on our platform. You will only pay once the product is live (for hosting) and you are satisfied with the quality. Would love to hear any tips or advice on ways to recruit design partners? Especially those who are actively starting to build their product? Cheers Liam