A MAVLink developer creates, tests, and deploys communication protocols utilized in drones and other unmanned vehicles. They use MAVLink (Micro Air Vehicle Link), an open-source protocol that allows communication between onboard drone systems and ground control software. They ensure seamless data transmission, including telemetry data, commands, and mission planning information. They troubleshoot issues, enhance existing systems, and develop new functionalities. Their work is crucial in improving the drone's performance, flight safety, and operational efficiency. They often collaborate with software engineers, hardware engineers, and other professionals in the drone industry.