Hi Shruti,
Thanks for the kudos.
We have two design teams:
Product design (product)
Design studio (brand & marketing design)
There are roughly 10 members in each team.
You might be surprised to hear that we’ve actually struggled over the years to hire designers to the company, even though we are so design centric. I hope its because we set the bar too high 
Our approach is based on strong design principles that we’ve developed internally that act as a mast in order to keep the quality high. Obviously you also need to hire good designers!
As far as product copy goes, we have people in the company dedicated to product and marketing copy and we somewhat pride ourselves on being on the cutting edge of product and marketing copy.