Building a marketplace sounds simple at first. You have sellers. You have buyers. One side offers a service, the other side pays for it, and the platform connects them. That was roughly how I looked at it when I started building NexoRush . The reality was very different. A marketplace is not just a website with profiles, listings, and a checkout button. You have to think about trust, payments, disputes, discovery, security, SEO, user experience, and perhaps the hardest problem of al...