And? There's a learning curve any time one starts a new job with a new code base. Do you think a senior engineer can't become productive in a new codebase with

And? There's a learning curve any time one starts a new job with a new code base. Do you think a senior engineer can't become productive in a new codebase with a new language in a couple of months? If so, I'm going to guess you've never worked with a good senior engineer.