Not a big company, however:
- uv (went from pipenv to poetry to uv), which was the right decision imo.
- ruff (replaced black)
- PyCharm, but some people use vscode or neovim.
- mypy for type checking, which I am not 100% happy with. One experienced developer swears by mypy, thats the reason we haven't explored alternatives.
- 'just' as task runner