I built a WPF desktop application that converts currencies using live exchange rates fetched from an external API and cached in a local SQL Server database. The app features two tabs: one dedicated to performing quick currency conversions with input validation, number formatting, and swap/clear actions, and another for managing exchange rates where users can add, edit, or delete currencies and sync changes directly with the database. Under the hood, the project integrates networking, JSON deserialization with Newtonsoft.Json, and parameterized SQL commands to ensure secure and reliable updates. This project showcases my ability to design end-to-end desktop solutions that combine API integration, database management, and modern WPF UI design in C#.