Would the following be a red flag?

"We promote modern languages like Python! We've had our own Python 1.5 based fork for 20 years now; there's some documentation, mostly from 10yr ago when the guy who started the project died. But we've got a good maintenance team and they understand almost all the magic he wrote in."

> Apprehension toward containers is a red flag.

"(almost) all our servers are in containers: we started buying cases after Ptyhon dude died, too. Previous server generations that live as stacks of unsecured hardware on shelves are being upgraded as can by the maintenance team."