CarWash is a cross-platform Flutter application that connects car owners with professional detailing services through a modern, role-based marketplace. The product includes separate flows for clients and detailers, multi-step registration with document verification, booking management with availability and working hours, in-app chat, reviews, and real-time push notifications. The backend is built on Node.js with a REST API, JWT authentication, MongoDB, S3-based secure file storage, and FCM integration for notifications. The solution also includes an admin layer for managing users, services, bookings, and platform analytics. Responsibilities covered UX/UI design, development of the mobile app, and implementation of the backend API.