TestFlight, now part of Apple, began as a project to make beta testing smoother and more accessible for developers and testers alike. With a focus on both problem-solving and character, I led the startup's product design to create a tool that balanced robust functionality with a playful, relatable brand. This case study explores how our unique approach turned TestFlight into an industry favorite—a product that solved real challenges while building a connection with its users, ultimately leading to Apple’s acquisition.