Designer for marketing and sales materials the innovation and software industry

Information for the business: We sell to innovation and improvement departments in large companies
Industry: Technology
Design details: We are looking for a designer to work with us on a long-term basis to make our content materials more visually appealing. This will include mainly our sales presentation, one-pagers, brochures, and eBooks.

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We tend to come up with lots of different content materials but we lack the necessary design capabilities. We need both, templates we can use for our material as well as help with designing specific slides or pages.
Messages to communicate through the design: Design needs to be professional and clean but playful

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We also need someone fairly versatile as we would like to try different styles in the near future in order to see what resonates most with potential customers.

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Here are some styles that we find inspiring:

Aspirational sales presentation (very down to the point)
http://bit.ly/2cBZwLN

Classic eBook (professional and clean)
http://bit.ly/2vdFF2f

Exciting eBook design (playful but also clean)
http://bit.ly/2vdH9JW
Ideas for the visual style: Professional and clean
Extra notes: