PowerPoint Presentation Template Design

I need a seasoned PowerPoint Template Design specialist to design a top-end, professional looking template for our company slide decks. This is a presentation template that will be used for our pitch decks and to send client proposals. It must be crisp, look very professional and slick, and be easy to use by people who aren't PPT experts.

We will need 15-20 template designs.

The designed template must NOT be AI generated or look like it's been built from a Prezi / Canva / Envato / Beautiful.ai / Visme etc stock at all.

We don't use cartoon-type illustrations, opting for crisp, professional photography always. The template will have to allow users to easily add high quality photographs in.

Brand guidelines, including font will be provided.