An Infosphere Streams developer designs, builds, and manages real-time analytics applications using IBM's Infosphere Streams technology. They work with high-volume, high-velocity data, transforming it into actionable insights. Their responsibilities include developing stream processing applications, integrating them with data sources, and managing the data flow. They also ensure the applications are scalable, reliable, and efficient. They work closely with data scientists and analysts to understand data requirements and deliver real-time analytics solutions. Their work aids in making data-driven decisions, improving operational efficiency, and discovering new business opportunities. They need to be proficient in programming languages, data analytics, and stream computing concepts.