I graduated from ZJU with engineer major, and get in Wharton this year. I also have two classmates graduated from HBS and Wharton respectively. To be frank with you, all three of us have so-so GPA, GMAT, and have no business sense before B-school. But we have great excurriculums and leadership experience, and that may be the reason we get in.
In your current work, I would suggest you to take more leadership responsibility, or initiate certain project and deliver the outcome. Or if you have opportunity to work abroad for HW, even in some poor countries, just push yourself for it. Such experience would give you enormous advantage when you apply for B-school.