Web Developer for Site's Mobile Maintenance

General information for the website: Live website currently having some mobile incompatibilities
Description of requirements/features: We are looking for a developer who can do mobile maintenance for a live website. As a background, the website is already live and working but there are incorrect details when the site is checked out in different devices or smartphones, such as:

- Text and image spacing, especially when tilted (from portrait to landscape and vice versa)
- Information stated in the site’s contact form is not passed on when done on mobile
- Contact details incorrect when its link is selected

We need someone who can correct these details in order for the site to function at its best even when checked out via mobile/different devices other than a PC or laptop.
Extra notes: