First, I'd remove the implication that the customer is not professional. Assume your customer _is_ professional, but needs help with some bureaucratic functions. The phrase "automatic streamlined process for managerial tasks like client onboarding, signing NDA and requirement collection" is pretty terrible and confusedly jargony. Who is signing the NDA? Unclear. Who is actually benefits from the service? Unclear. IS NDA signing and requirement collection a part of the onboarding process, or some other thing? Unclear.

"We help professional freelancers provide a streamlined process for creating new client accounts. Collecting your client's requirements and NDA forms can be managed directly from your own website."