But otherwise, I feel like trying to choose the language that scales to a million lines sounds like dooming in the beginning itself by over-engineering. I attempted that myself but kept coming back to python because it's fast to code, it's forgiving as hell and its customizable. Once you're used to it's quirks you can breeze through it fast. I'm sure ruby and js have the same as well, and with ts you get better typing, but with the typing you can do with 3.8, I'll argue that python gives the _best_ of both worlds if it's especially mixed with a good IDE like pycharm. If you really want, you can also incorporate pytype or something from the get-go. If my Greenfield project's biggest problem is that python doesn't scale, then I'm a very happy man.