First of all, a job seeker needs to apply for an interview. If he have some connection, he can refer him for an interview as well.
There there is an onsite interview where user have to pass from 3 different interview phases.
Job seeker needs to answer questions, solve problems to pass an interview.
At the last, there is a final interview with CEO of the company.
HR manages different social media platforms and If there is any vacancy available, it will post on these platforms. You can also get your interview schedule through references.
Apply for the opening, clear the interview thats all.