We design, build, and maintain infrastructure to support agentic workflows for Siri. Our team focuses on data generation, introspection, and evaluation frameworks, which are essential for efficiently developing foundation models and agentic workflows for Siri applications. As a Machine Learning Engineer -- Backend/Data Engineer, you will have the opportunity to work at the intersection of cutting-edge foundation models and products. This includes working on data pipelines, model evaluation, and infrastructure to support agentic workflows.