Hi Francis, at Lazada I also do UI design (there is no UI specialist), and I think it will be the same in most other companies.

However it still depends on how each company wants to structure their team and usually they apply the T-shape designer to solve the problem of lacking skills in some areas. Just in case you want to know more about T-shape: https://medium.com/the-edge-of-a-void/introduction-to-t-shaped-individuals-interdisciplinary-work-1db3a09c2aac