An Adaptive Bitrate Streaming (ABR) developer designs and implements algorithms that optimize video playback quality based on network conditions. They work on systems that dynamically adjust video quality and bitrate in response to changes in network bandwidth and computational resources. Their tasks include coding, testing, debugging, and improving the performance of ABR algorithms. The goal is to provide seamless streaming experiences, reducing buffering and improving playback smoothness. They also collaborate with other teams to integrate these algorithms into larger systems, ensuring compatibility and functionality across different devices and platforms.