This question mixes in different elements of singular versus plural as well as references to pronouns in other parts of the sentence. There's also multiple uses of the word "and" -- so it may get a little confusing to understand the groupings of the words and how exactly the sentence is constructed.
Let's take a look.
In Banana Web Designs - means we are talking about a particular company called Banana Web Designs. Developers are creating a company website. The sentence implies that the developerse' creativity is utilized on this company website AND [this other thing]. "This other thing" refers to the singular entity of "the design and implementation of the back-end server that stores it."
Wait a minute. Who's storing what?
Well, it's the back-end system that is storing the website. So whatever solution you choose, make sure that solution clearly shows this intended meaning of the original sentence.
source: GMAT Pill
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