Question

What's correct:  I am the person who will work with you" or I am the person who will be working with you"?

Answer 1

who will work with you

Answer 2

Who will be working with you

Answer 3

Depends on your time phrase.

I would vote for "who will work with you" because it's more general. If you choose "who will be working with you", you'd need to add a specific time period in the future to make it justified, e.g. "...who will be working with you over the next month".

Answer 4

Both are correct, the first option is more general and the second one could indicate a temporary action, something that could happen in the future but it needs a specific time clause, when it is not expressed is because it is implied or was informed in a prior conversation.

Answer 5

who will be working with you makes more sense