I worked at PetroChina full-time
The branch is well-structured and organized.
It is a large corporation so there are many routines.
3 rounds interview. Nothing special. Two interviewers asked me in the first round. One on one in the second and third round interview. The result is sent after three weeks later. The total applicants are more than 1000. Only 30 people are able to be hired. It is highly competitive.