First amendment rights are pretty sacred here. Generally, yes, you can say whatever you want without LEGAL consequences.
For a defamation case to succeed in the US, the accuser has to prove that a statement was made that a reasonable person would interpret as a statement of fact. That means that something like "zuru is the worst place to work in the world!" would not put the person at risk of losing a defamation case, because "worst place in the world" is subjective, and no reasonable person would think it is an objective fact.
If they said something like "zuru management ate my babies!".... well, that still wouldn't get them in trouble because it is so obviously not true that no reasonable person would think it was a statement of fact.
If they said, "zuru didn't pay me my last paycheck," well then you might be at risk for defamation if it turns out they did actually pay you (the truth is always an absolute defense in the US, so you can't get in trouble for saying something that is true)
Now, even if it wasn't true, the accuser still has to prove that the person either KNEW it wasn't true, or completely disregarded whether it was true or not when they made the statement.
It is hard to get someone in trouble for what they write or say in the US.
For a defamation case to succeed in the US, the accuser has to prove that a statement was made that a reasonable person would interpret as a statement of fact. That means that something like "zuru is the worst place to work in the world!" would not put the person at risk of losing a defamation case, because "worst place in the world" is subjective, and no reasonable person would think it is an objective fact.
If they said something like "zuru management ate my babies!".... well, that still wouldn't get them in trouble because it is so obviously not true that no reasonable person would think it was a statement of fact.
If they said, "zuru didn't pay me my last paycheck," well then you might be at risk for defamation if it turns out they did actually pay you (the truth is always an absolute defense in the US, so you can't get in trouble for saying something that is true)
Now, even if it wasn't true, the accuser still has to prove that the person either KNEW it wasn't true, or completely disregarded whether it was true or not when they made the statement.
It is hard to get someone in trouble for what they write or say in the US.