How was it formalized in Petrovich and previously in Gazpromneft?

This question concerns personal experience and onboarding in companies, which is not related to the technical field of Golang. Usually, onboarding in large companies such as Petrovich and Gazpromneft includes standard procedures: signing an employment contract, providing necessary documents, possibly passing a probationary period, and an introductory briefing. If the question is about how to structure or instantiate objects in Go, please clarify.