An ARINC developer specializes in creating, implementing, and maintaining avionic display systems and applications following the ARINC standard. They design user application interfaces (UAIs) for cockpit displays, ensuring that they comply with the specified guidelines for safety, functionality, and user interaction. They work on the data definition, widget design, and communication between UAIs and User System (the avionic system). They also troubleshoot issues, enhance system performance, and work on system integration. Their role is crucial in ensuring the safety, efficiency, and effectiveness of avionic systems, contributing to the overall performance of the aircraft.