Vehicle owners today need better digital tools to manage car maintenance, which is why this thesis introduces Carly, a full-stack web application that makes tracking and scheduling vehicle services much easier. The project was built using the MERN stack (MongoDB, Express.js, and Node.js with a React frontend) to create a scalable and user-friendly system. Carly offers practical features like maintenance reminders based on mileage, cost estimates, DIY repair guides, car pricing information, secure login, and an online booking chat. The application went through testing to ensure it works reliably in real-world situations. This thesis shows how modern web development can transform the automotive service industry by addressing actual user needs and opening doors for future innovations in vehicle maintenance technology.