Just use kotlin or golang. You get a modern language and you get types. And you still have java libraries with kotlin. I totally understand the lack of typin

Just use kotlin or golang. You get a modern language and you get types. And you still have java libraries with kotlin. I totally understand the lack of typing & static compilation making things painful once you reach a scale where you can't put the codebase in your head. Asserts, unit tests and variable names are poor substitutes. As an interm solution have you tried converting your internal python code to be fully typed with 'optional types'?