All employment is “at will” in Tech, you can be fired for any reason. The only thing preventing you from being fired is your capacity to create value for the company (as seen in the company’s eyes)
Unless you’re truly irreplaceable, you don’t have much leverage by default.
Wrong. The reason cannot be discriminatory
An important distinction to make, one that can cost a great deal if not made
Except in the US there are about 100 ways employers can still fire you even if the underlying reason is discriminatory.
They just can’t expose the real reason in writing and they make up other reasons (or no reason at all).
Edit: and just to be perfectly clear, I don’t applaud companies who discriminate (I myself am a minority frequently discriminated against). Just pointing out the unfortunate reality that non-discrimination laws are extremely weak and ineffective in the US when it comes to hiring/firing.