Building an app like Amazon Prime Video requires several key steps. First, conduct market research to identify your target audience and competitors. Choose a technology stack, including frameworks like React Native or Flutter for cross-platform support. Implement essential features such as video streaming, content management, user profiles, payment gateways, and recommendation algorithms. For hosting, use cloud services like AWS or Google Cloud. Secure the app with DRM and encryption. Lastly, focus on a seamless user interface and ensure compliance with legal standards, including licensing agreements for content. Regular updates and customer support are crucial for maintaining user engagement.