Architect-Level Shopify App Build

I’m kicking off a green-field Shopify app that will sit at the core of several Shopify Plus storefronts, and I need an architect-level partner to help shape and ship it. The single most critical focus is custom app functionality... (Budget: $30 - $250 USD, Jobs: API Development, HTML, JavaScript, Node.js, PostgreSQL, React.js, Shopify, Website Design)