This year’s Top Places to Work roundtable brought together executives from three very different industries: residential real estate, grocery, and Internet security. But Carol Bulman, chief executive of Jack Conway & Co.; Gary Pfeil, president of Roche Bros.; and Mike Tuchen, chief executive of Rapid7 do have something very much in common: Their companies have made regular appearances on our Top Places list. They recently met at the Globe to share insights into hiring and retaining employees, as well as where the economy is heading. Below is an edited conversation with Globe business editor Shirley Leung: