Teaching software architecture effectively requires bridging the gap between theoretical concepts and practical application, particularly in complex domains like software for aerospace systems. This paper presents \(\textsf{CUBEX}\) , an exemplar developed for teaching software architecture to master’s level university students. The project utilizes the JPL’s F \( ^{\prime }\) flight software framework within the context of a simulated CubeSat mission focused on orientation monitoring. Students are tasked with developing key flight software components, specifically an Inertial Measurement Unit driver and a Payload processing component, adhering to specified mission requirements. Through this process, students gain practical experience with core software architecture principles, including component-based design, interface definition, telemetry and event handling, and system integration. We detail the project’s technical foundations, pedagogical structure, and its value as a readily available, reusable educational artifact designed to facilitate teaching of contemporary software architecture principles. Artifact: software.aerospace.uoa.gr/cubex Video: software.aerospace.uoa.gr/cubex/overview.mp4