In the UK (and most other places with fairly strong employee protections I imagine) it becomes pretty difficult to get rid of employees once they've been around for a while. Often involving a lengthy "managing out" process. Given this, it's common for a 3-6 month "probation period" when starting a new role in which you can be dismissed fairly arbitrarily. This makes sense given the commitment taking on an employee re…
In the US, that does not happen. The expectation is someone only gets terminated in the first year if they are terrible. Unless it’s a tiny startup, such a stint would raise concerns.
I believe Reed Hastings at Netflix has advocated in the past for a hybrid approach "hire fast, fire fast" - interviews can be nearly useless and unfair. See people who are excellent employees but poor "test takers" vs people who are actually terrible and incompetent but can crush an interview.
In my experience you just don't know what's going to happen until "the rubber meets the road".