Custom Managed Marketplace Development

I need a full-featured managed marketplace built from the ground up. Custom development is essential because I want the freedom to design every flow exactly the way my users expect, rather than squeezing the site into an off-the-shelf WordPress or Shopify template.

Core marketplace functions I must see live at launch:
• User profiles and reviews
• Robust search and filter capabilities
• An escrow payment system tied to a reliable payment gateway you will integrate end-to-end

Beyond those pillars, security is non-negotiable. Please apply current best practices—OWASP-aligned code reviews, HTTPS everywhere, secure authentication and authorisation, and regular vulnerability scans—so the platform is production-ready from day one.

Clean, responsive UI/UX, SEO-friendly architecture, and performance optimisation should be baked in, not bolted on. I will expect well-documented, modular code (preferably following MVC or a comparable pattern), a clear README for deployment, and handover support for the first release.

Show me examples of custom marketplaces you have shipped, outline the tech stack you propose, and give a realistic timeline for each milestone so we can get started right away.