Ask HN: Why is TrueVault leaving python for java?

I noticed this job posting yesterday (https://news.ycombinator.com/item?id=10810547) stating that TrueVault is looking for a Java engineer to completely rewrite their platform in java instead of python.

As many of us here use both languages from time to time, and the pluses and benefits of both have been discussed and debated over and over, it'd be really nice to hear from them why they're leaving python and lessons learned, if any.

Can anyone comment on this?

Thanks!