Developer Experience (DX) is increasingly recognized as essential in software development, akin to user experience but tailored for developers working with tools, libraries, and platforms. The text explores how DX impacts three individuals: Alice, Bob, and Carlos, each with unique roles and challenges. Alice, a Product Manager, enhances her product's DX by adopting a developer-centric approach, inspired by successful companies like Stripe. Bob, an Internal Tools Lead, transforms underused tools into essential resources by treating them as products and focusing on usability and developer feedback. Carlos, a Director of Engineering, addresses the challenges of a rapidly growing team by standardizing tools, improving documentation, and fostering collaboration to enhance productivity. Field testing and feedback collection are highlighted as vital methods for understanding and improving DX, ultimately driving developer satisfaction, adoption, and organizational success.