Web, mobile and tablet design

We need a skilled designer, experienced in Sketch, to finish a design and make it ready for coding. The design include screens for web, tablet and mobile. You will receive a Sketch file and and you will help us improve and complete the design. If you apply you may see what we got before starting work. The final design, with design assets, will be uploaded to our Invision account (this can be done very easily with Craft). We are looking for someone who would like to understand the product we are building and can come up with solutions for the screens we need. We are aiming for the job to start quite quickly.