Implementation of effective interventions for HIV care engagement is necessary to raise the percentage of people living with HIV/Acquired Immunodeficiency Syndrome (AIDS) who are virally suppressed and in continuous care. The ultimate goal of this study is to assess the effectiveness of a mobile phone app that utilizes game mechanics and social networking features to improve engagement in care, and ART uptake and adherence among HIV-positive YMSM and trans women who have sex with men. The high mobile phone ownership among adolescent and young adults supports using intervention tools based in these familiar available technologies. If successful, Epic Allies would be clinically attractive, as adherent patients would require less frequent clinic visits and experience fewer HIV-related secondary infections and financially attractive, as reducing clinic visits and secondary infections. Epic Allies could also greatly impact public health as ART adherence reduces HIV infectivity and subsequently reduces HIV transmission.