An IBM Rational Rhapsody developer designs, tests, and implements software systems using the Rhapsody model-driven development environment. They create visual models to represent complex software systems, allowing for a clear understanding of system architecture and design. They use Rhapsody's automated code generation feature to convert these models into executable code. They also use Rhapsody for real-time or embedded systems development and systems engineering. Their responsibilities include debugging and troubleshooting, ensuring system integrity, and maintaining documentation. They collaborate with other software professionals, and they continuously adapt to new technologies and methodologies.