Dear Hiring Manager,
I understand from your are looking for a Graphic Designer. And you need( logo design, web page design, mobile layout design, some art , presentation design), That's all are pretty clear to me.
Well, I do have experience in Graphic Designing that is hard to come by. So I always make Designs that are easily accessible and graphics that are recognizable.
I have built a large number of creative designs for the top notch international brands.
So it would be quite easy for me to create a designs as you needed. you will get responsive & pixel perfect results from my end :)
Let me know if you want to see my work.
Thank You!