ZEN CART Professional, need to update our site

we have a zencart store with around 200k products and 55 categories. i need an expert in zencart professional to accomplish design updates and new functionality. i have around 20-25hours of work now that needs to be accomplish. candidate should have a lot of experience in zencart and plugging dynamic modules with the admin section. candidate should have some design experience as well. please send me portfolio and big functionality you have done on zcart. work starts this weekend since its urgent.