Hi Gayathri,
This is really a very interesting question. Hope this could be of information.
Designations are most of the time superficial and depend on the company structure, type of company, headcount, private limited, public limited, and their inherited structure if an MNC (Please refer for MNC and its working structure).
It also depends on some variations like diversity, culture, richness, and maturity of the organization and, of course, the maturity of the HR department as such in the organization.
Assuming some cases:
Case 1 - A private limited company with 4 board of directors and 150 headcount and 1 setup or branch.
Probably - 1 for Talent Acquisition, 1 for ER, 1 for Comp & Ben, 1 for Payroll, and that is too much, what your bosses would say!! ha ha ha
Case 2 - 3 to 10 branches with 200 employees - Same as above - could be more if an MNC; however, multitasking would be deserved, would increase job role.
Case 3 - 1000+ employees across different regions (East/West/North/South) would require specialists.
To implement such a structure, we would need career path planning, growth, promotion, succession planning, etc.
Also, your work experience, degree/PG (MBA/NON-MBA)/MBA from rated business schools (e.g., Tier 1, 2 / 3 / 4, please read separately), total work experience, relevant work experience, and thus the designation is decided.
For example - refer to Case 1. Assuming a Manager/Senior Manager/AVP/Director with 6 to 10 years heads the HR department (What would be his/her next move)? Especially in case a person shifts to a larger setup.
Hope this adds some value. Revert for any queries.
Regards,
MBHR