Jjayeshprakashpatil11injayeshpatilblog.hashnode.dev·2d ago · 8 min readBuilding a Contract-First Expense Sharing Application with Specmatic, FastAPI & OpenAPILearn how I built a Expense Sharing Application using FastAPI, OpenAPI 3.0, and Specmatic, and how Contract-First Development helped me catch API issues before they reached production. Introduction 00