I applied online. The process took 1 day. I interviewed at Define Labs
Interview
1st aptitude test
they just provide one test related aptitude like antonyms, synonyms ,English basics
2nd technical test
they provide application task like Gmail drawer feature and json
3rd face to face
basics questions about swift and some puzzles
overall process and questions was good .you just have to prepare basics c fundamentals and ios swift that's it.