Most people will be unsuspecting that you are Jewish, and even if they realize that you are Jewish, they will not think much about it. Perhaps they will ask you if you have any dietary restrictions and that's it.
Then, most Christians today see Judaism as another Abrahamic religion that is close to Christianity, not as a fundamentally different thing (even if in practice, it can be substantially different). Also, most people in the West are becoming increasingly secular and non-religious.
But as soon as jews don't blend in, either by traditional hair cuts or clothing, or by virtue of being at a synagoge, things are different. We still have enough anti-semitic incidents in Germany to actually be worried. I once worked with a guy who insulted a co-worker behind his back for being a jew (based on the family name, no idea if it's true or not). So yeah, you do get discriminated against if you are a jew. Not the same level as blacks in America, or muslims in India (add other example of extreme racism), but you do.
Only valid for Germany for lack of reevant insight and experience in other countries.
The situation outside those tech hubs can be very different.