Jamie Glenn, Sean Black and Karan Sakhuja are the founders of Knock, a home-flipping startup for homesellers. All seasoned veterans in real estate tech, Black (CEO), Glenn (COO) and Sakhuja (lead engineer) have created an app that allows sellers to set a guaranteed price and receive professional photos, video and a virtual reality tour for promotion on the local MLS, Zillow, Trulia, realtor.com and Yahoo. Knock’s founders are working to create a disruptive real estate service for the consumer but also promise to handle details like arranging escrow and closing.