everything was written correctly for you, but I have my own opinion on this matter. I don’t think that one programmer or freelancer will help you .. it’s better to contact a company that works with large amounts of data and has experience working with them .. it’s good that at the moment there are a lot of them and you will have a real choice. And if you are interested in this topic, you can look here: https://data-science-ua.com/big-data-company/