UX design manager Cennydd Bowles from UK told us that Twitter has 2000 engineers to make sure to give the best service to the people. Twitter has several departments all over the world (Sant Francisco, UK, NY, Boston, Seattle and Tokyo).
Cennydd Bowles believed that a person with a lot of skills will be needed in the future and specially motionsdesigners.
So if you want to work for Twitter skills like how to designs good transitions will be a good thing to have.