Dual Gif Slideshow Creation

I require a proficient coder to create a slide show that displays two 500x500 pixel gifs one on top of the other. An essential feature is to incorporate slide in/slide out transitions for each gif, ensuring a smooth and visually engaging experience. Prior hands-on experience with slideshow creation and gifs manipulation, as well as a keen eye for detail are essential for this project. A good understanding of user experience and visual design will be a plus.