A GnuRadio developer designs, develops, and tests software-defined radio (SDR) systems using the GnuRadio platform. They create signal processing blocks in C++ or Python, assemble these blocks to build complex communication systems, and analyze their performance. Their tasks also include troubleshooting and resolving issues related to radio frequency communication. They work on various applications such as radio astronomy, IoT connectivity, and wireless networking. GnuRadio developers also contribute to the open-source community by creating new modules, improving existing ones, and providing support to other users. They continuously adapt to the evolving field of digital signal processing and radio communication.