This course, part of the Software Development MicroMasters Program, introduces how teams design, build, and test multi-version software systems. You will learn software engineering principles that are applicable to the breadth of large-scale software systems. The course explores topics such as agile development, REST and Async programming, software specification, design, refactoring, information security, and more. By the end of this course, learners will work in teams, applying an agile software development process to specify, design, and test multiple versions of complex software systems. Learners who enroll in the Verified track will receive staff grading and increased interaction with the instructor and staff.