Yes, you can—you have to because there won't be any other alternative. Companies will operate without HR for 2 to 3 years, and they feel that one Production Manager and Finance Manager are more than enough to run a company. After 3 years, the employee-related problems escalate because there is no people orientation, welfare, proper statutory compliance, etc. Subsequently, with a lot of dissatisfaction, employees resort to collective bargaining, etc. The real challenge begins at this point—employees raise disputes, the labor department inspects and requests all sorts of records, appointment letters, documents, confirmation letters, etc. The organization then has to issue the appointment/confirmation letters with retrospective dates.
If the HR joins after 3 years, even then the HR head wants to keep everything in order. They start with job applications, testimonials, nominations, etc., and then issue the appointment letters with retrospective effect.
Regards,
Kamesh