What's your service's deploy strategy? Have you ever considered Zero-Down time deployment?

Longtime no see, fellas. I was given a new task for designing new deploy strategy for our service. Well, our previous deploy strategy was not good enough for running a stable service. It was based on Bitbucket Web hook with deploy script written in P...

If you were given a project that analyzing 100,000 user data, Which language do you prefer? Python? R? and Why?