TapCommerce is a startup that sells app engagement ads. The company has raised $10.5 million in Series A funding led by Bain Capital Ventures and RRE Ventures. Previous investors Metamorphic Ventures, Eniac Ventures, and Nextview Ventures also participated in this round. Some of TapCommerce’s customers includes Fab, eBay, and Jackthreads. App engagement ads encourages mobile users to open apps that they already have on their devices again-and-again.