I've no idea what their architecture/implementation looks like, but I've built a similar tool for my own use and the improvements are dramatic to say the least.
Mine's a simple BM25 index for code keyword search (I use it alongside serena-mcp) and for some use cases the speeds and token efficiency are insane.
https://gitlab.com/rhobimd-oss/shebe#comparison-shebe-vs-alt...
It's amazing that you can do this on your own but the company in question cannot although they have raised $6M. If your README were their entire pitch and website and, it would be 100000x more convincing.
(I detached this subthread from https://news.ycombinator.com/item?id=46195560 because your comment is fine and I don't want it to be penalized.)
looks cool, what's the largest codebase you have tested it on?