When to use to join a company in Korean
Korean: 입사하다[ ip-sa-ha-da ]

When to use it
To join a company means to start working there as a new employee. In Korean, 입사하다 is used when someone begins a job at a company, office, or business. You can use it to talk about yourself or another person.
Example sentences
저는 지난달에 작은 회사에 입사했어요.
I joined a small company last month.
우리 누나는 오늘 새 회사에 입사했어요.
My older sister joined a new company today.
아버지는 다음 주에 서울 회사에 입사하세요.
My father will join a company in Seoul next week.
친구가 은행에 입사해서 아주 바빠요.
My friend joined a bank, so he is very busy.
저는 졸업 후에 여행 회사에 입사하고 싶어요.
I want to join a travel company after graduation.
"언제 입사했어요?" "올해 봄에 입사했어요."
"When did you join the company?" "I joined in the spring this year."