Dynamic JavaScript UI Development

I am concentrating this phase of the project on JavaScript, so your main job is to craft a responsive, interactive front-end layer that seamlessly ties into the existing back-end services written in Java and Python. The core of the assignment is to deliver polished interface behaviours that feel fluid to the user, while also handling data and form logic in-browser so the page never needs a clunky full reload. What has to be covered • User-interface interactions – subtle animations and effects that enhance, not distract – intuitive drag-and-drop for re-ordering items and uploading files – real-time updates pushed to the DOM (think websockets or long-polling) • Data manipulation on the client, including lightweight caching and transformation before it reaches the API endpoints. • Rock-solid form validation that catches errors instantly and presents clear inline feedback. I do not mind whether you choose vanilla ES6+, React, Vue, or another modern framework as long as performance stays high and the code is clean, documented, and testable. Every feature should ship with concise unit tests, and if you can wire them into our existing automation test suite that would be a plus. Hand-over requirements 1. Source code in a Git repo with meaningful commits 2. A short README covering build steps, environment variables, and how to run the tests 3. Demo link or instructions to spin up a local preview If you are ready to dive into the JavaScript layer and make the interface come alive, let’s talk timelines and milestones.