An Apache Airflow developer designs, builds, and maintains workflows, or sequences of tasks, using the Apache Airflow platform. They create Directed Acyclic Graphs (DAGs) to visualize workflows, ensuring tasks run in a structured manner. They also set task dependencies, schedule tasks, and automate retry in case of failures. They work on monitoring, debugging, and optimizing the performance of these workflows. Their role may include integrating Airflow with other applications via APIs. They may also need to customize Airflow according to specific business needs. Their ultimate goal is to automate and simplify complex data pipelines.