I struggled with low-level design interviews even after reading a lot of blogs and books. The problem wasn’t lack of theory, but lack of real practice.
So I built a visual-first LLD practice platform that mimics how interviews actually happen: - clarify requirements - identify entities - draw class diagrams - apply design patterns - write code - and get structured AI feedback
It includes an interactive playground with real-world problems (parking lot, ATM, JSON parser, etc.), visual explanations, and multi-language solutions.
This is a bootstrapped side project and I already have a small set of paying users. Would love feedback from the HN community.
Website: https://lowleveldesignmastery.com/
Happy to answer any questions.