Stein is fresh off raising $32 million, adding to the $13 million his firm has raised to date for a total of $45 million. The $32-million round includes participation from previous investors Boston-based Bessemer Venture Partners; Menlo Ventures in Menlo Park, Calif.; and London-based Anthemis Group. The legacy partners are joined by new investors Palo Alto, Calif.-based Citi Ventures; Boston-based Globespan Capital Partners; and Northwestern Mutual Capital LLC in London