All UI, UX, and logic. All done without shortcuts, clean, and readable. Scalable and performant. Guaranteed to be scalable and performant for millions of users or with thousands of videos. Done in React Native, Redux (if necessary), AWS (as necessary), GCP (as necessary), Azure (as necessary), any other third party APIs (as necessary), CI/CD toolings (as necessary), and implementation of the backend to make the feature work. For the backend, the default will be Node.js.