In response to:

As the only designer at a company, how do you get founders and rest of the team the understand the value of design?

You're already on the team, so you've got a leg up where the company realizes they need design. Learning the language of business helps you tremendously. If you can show that design is an integrated part of successful companies, you will win them over in terms they understand by showing there is tangible value in the design process. Include the team in the design process early and often, and demonstrate that design thinking can have real monetary impact.

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