I acquired a strong foundation of writing skills, including the ability to write op-eds, proposals, and memos. Throughout my studies I demonstrated the ability to be a team player who enjoys team settings yet maintains efficiency when working alone to conduct research for complex projects, particularly in presentation of research.

Are there grammar errors? Do the sentence flow smoothly enough?

DOES the sentence flow smoothly enough? Not DO.

I think the compound/complex sentence beginning "Throughout my studies..." could be more than one sentence. If you let it stand, you need a comma after "team settings".