Website Modification having designing tasks as well.

We need to modify all design of our website, every pages are on Photoshop. So your developer only need to take the PSD files to modify. Maybe, we will have to add button on our API for information on the website. But it's only simple thing. We have to work with a deadline, 15 days to do design of the website and responsive sure. Why, because we work with other company before and they promise us a work finish in few days and that take months. So that can't be possible, if that take a lot of times, we can't work together. We don't want a developer work on our project and on other project in same time. It's about that we loosed time before. So if you have a developer with this skills, we can share you the work. Maybe one page before to see if he can do what we want. If it's we can start.