The Third Edition of the Software Architecture: Theory, Technology, and Applications (SA-TTA 2015) is part of the 30th ACM/SIGAPP Symposium on Applied Computing (SAC).  For the past twenty-nine years, ACM SAC has been a primary gathering forum for applied computer scientists, computer engineers, software engineers, and application developers from around the world. SAC 2015 is sponsored by the ACM Special Interest Group on Applied Computing (SIGAPP), and will be held in the historic city of Salamanca, a UNESCO Declared World Heritage City!