Ulas Karademir, ex-RealityOS, returns to videogame developer and publisher IO Interactive, becoming chief technology officer ... Sterling Infrastructure promotes Vice President-Finance Sharon Villaverde to chief financial officer-chief accounting officer, succeeding Ron Ballschmiede, remaining executive vice president until his planned retirement later this year ... Digimarc taps Carle Quinn, ex-Workato, as chief people officer ... Ninjio, cybersecurity awareness training company, names Jon Dion, ex-AuditBoard, chief revenue officer ... SmartBear, software development company, hires Allego’s Amy Cohn as chief people officer ... Upstream Security, cybersecurity detection and response platform for connected vehicles and IoT, appoints former Gartner executive partner Toshiya Sato, also ex-Fujitsu, as president-Japan ... Fortune Live Media hires Kristin Stoller, ex-Forbes, as editorial director.