أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
The back ground verification would involve multistage approach, right from collecting the documents of all the employers Offer and relieving letter. If it is a registered organisation with NASSCOM them there are no hurdles in the process and you can rely on them.
I do not agree with you as third party will conduct your organization sensative information. HR department can collect this information and it is a best practice.