You haven't complete your post yet. Although from the above condition I understand your perplexity on the account of comoany's BGV. Being a potential job applicant (selcted for a specific role) any employer will do BG checks as imposed.
Educational & Employment corroboration are proirity in nature.
- They involve direct checks on employmnet history concerning to their aspects decided. May it be Position wise, Salary-wise, Tenure-wise etc.,
- Most employers take the "Third Party Services" for employment screening professionally (for much integrated outcome/accurate results). These entities do numerous BGV's.
- Rest imply on NASSCOM database management, if the client requires to know your exact work profile (in case your enrolled in such database) earlier by the x-companies worked.
I see that you have done a massive role-keeping & I identify it to be affirmative in-terms of your employement. You need to understand, the employer selected you as a potential candidate as I'm sure he would forsee the part of work that you've contributed unless of any wide-of-the-mark by you.
All the Best...!