sahil63604-sudo/lld-practice-platform ? reverse-engineered prompt

Build me a full stack app for practicing low level design problems.

I want users to be able to browse a small set of LLD problems like Parking Lot, Library Management, Tic Tac Toe, Elevator, and Movie Ticket Booking, then open one, start a practice attempt, and write a text based solution describing classes, responsibilities, relationships, interfaces, patterns, edge cases, and testing thoughts.

After they submit, the app should save the attempt, run a structured evaluation, and show clear feedback with an overall score plus separate scores for things like requirements, responsibilities, abstractions, extensibility, and testability. For each part, show evidence, concerns, and suggestions in plain language, not just a score.

Also add a history page where users can review previous attempts and feedback, and try the same problem again later. Use a simple MERN setup with a React frontend, Node and Express backend, and MongoDB for storage. Keep the evaluator deterministic and easy to replace later if needed. If you need to, look up current docs online.