Multi-Vendor Marketplace Development on WordPress

I am looking for an experienced WordPress developer to build a multi-vendor marketplace platform across 3 separate, completely isolated websites targeting the same niche.Each of the 3 sites will sit on a separate hosting account and must have a completely different look, style, and color scheme so they appear as independent platforms. However, all 3 sites must securely funnel their registration and booking data into one single administrative database.Core Architecture Requirements:Install and configure a professional directory theme framework across 3 independent WordPress setups, applying completely unique visual styling and branding to each.Enable front-end vendor dashboards so independent contractors can register, manage profiles, bios, rates, and upload background checks.Set up location-based search filtering by postcode.Integrate Stripe Connect to securely process payments, automatically take a % platform commission, and route % to the contractor.Mandatory Speed & Performance Requirements:90+ Google PageSpeed Score: You must optimize the setups to achieve a 90+ score on Google PageSpeed Insights for both mobile and desktop.Performance Optimiaztion: Minified CSS/JS, clean database queries, optimised image delivery, and proper caching configuration.Mandatory Technical SEO Requirements:Clean SEO Architecture: Flawless HTML heading hierarchies (H1, H2, H3) and custom permalink structures for clean, readable URLs.Schema Markup: Correct local service schema implementation across the platform layouts.I will provide the 3 independent hosting accounts and themes. Please send links to previous WordPress marketplaces or directory type sites you have built, along with your estimated timeline and quote. Also provide quote Thank you