I Built a Reverse Marketplace with .NET 10, gRPC-Web, and Vanilla JS

The Problem with Traditional Marketplaces Every marketplace works the same way: sellers list products, buyers scroll through thousands of listings hoping to find what they need at the right price. I wanted to flip this model. What if buyers posted what they wanted and sellers competed to offer the best deal? That's WTB.land - a reverse marketplace (WTB = Want To Buy). How It Works Buyer posts a request - "I want a MacBook Pro M3, budget $1500, like-new condition" Sellers browse requests and submit offers with price and description All offers are public - sellers compete, highest bid gets a TOP BID badge Buyer picks the best deal - chat with sellers, compare offers, done The Tech Stack Backend: .NET 10 (ASP.NET Core MVC + gRPC) Database: SQLite (yes, really) Frontend: Vanilla JavaScript SPA (~1800 lines, no React/Vue/Angular) Protocol: gRPC-Web over protobuf (not REST/JSON) CSS: Tailwind CSS 3.4 Deploy: Single binary on a $7/month Hetzner VPS Why gRPC-Web Instead of REST? Binary protobu