I don't know how many of you uses IBM Watson api (personality insights). We use in our office. They send back a huge data known as big 5 needs etc. They find the personality of a person from his speech. like anger, happiness etc. I don't understand how they calculate them and also every client trust the data what ibm tells is correct. if it was you if you have done that feature too many questions might have come.

that's the difference between mnc and a startup