Note that if you want to land a job in industry working on theory, then keep in mind that there are not many such places. Even at Google, Meta, MSR I believe that theoretical researchers are only a small fraction of the total. Moreover, the competition is very fierce. You would likely compete with students coming from top US universities, which usually have very good connections to those places (because well most of them are in the US). Also, those students have a lot of publications since PhDs in US last more years. Hence, if you embark in this journey make sure that your supervisor has good connections to those places and try really hard to get internships there (again, this will be easier if your supervisor knows people in industry).