Hi Shekar,
An HR administrator is a human resources generalist responsible for supporting a business within every area of human resources, including recruitment and employee relations.
Some general roles and responsibilities of HR Administrator are:
Drafting Job Description: An HR administrator is responsible for drafting job descriptions, outlining in detail all skills and qualities required and desired in a successful job applicant.
Resume screening: An HR administrator screens all resumes submitted to the open job order, seeking only the most qualified applicant.
Performing Background checks: An HR administrator conducts drug and background screenings and reference checks for all prospective hires, accurately documenting these activities.
Due Diligence: An HR administrator records and maintains all human resource files and documents, assuring that his or her firm remains compliant with the U.S. Equal Employment Opportunity Commission (EEOC).
Employee and labor relations: An HR administrator serves as the point person for employees' issues and inquiries, including but not limited to benefits and company policies.
Hope this would give you some idea about the duties and responsibilities. You can find more if you go through google.
Regards
Jui