A Deep Learning developer designs and builds machine learning models using deep learning algorithms to draw patterns and insights from large data sets. Their work involves managing data platforms, improving data quality, analyzing complex data, and optimizing neural networks. They also conduct research to advance the field, implement new machine learning algorithms, and improve existing ones. They work closely with data scientists and other stakeholders to understand the business needs and translate them into AI applications. They are also responsible for testing, debugging, and maintaining these systems to ensure their reliability and performance.