IOWA CITY — In a matter of weeks last March, Riley Eynon-Lynch saw use of his company’s product increase by 1,000 percent.“We have an amazing technical team that could scale our infrastructure really fast, and then amazing sales and marketing teams running 10 trainings a day,” said Eynon-Lynch, the CEO and one of the four co-founders of Pear Deck, an education technology company in Iowa City.One of Pear Deck’s professional development events had 40,000 teachers watching.