Build world class large language model at scale to power question and answering system for Siri Craft and develop core software infrastructure to support natural language understanding system in production Design and implement the low latency and high reliability runtime tech stacks for global search Design and develop data pipeline and infrastructure for large scale of data processing Evaluate and benchmark Apple natural language processing models, and deploy them to serve billions of Apple users8+ years of industry related experience, working in collaborate environments Utilizing PyTorch, TensorFlow, and JAX for training and deploying deep learning models Understanding product requirements and then translating them into modeling tasks and engineering tasks Building models for search relevance ranking, query understanding, and summarization BS or MS in Computer Science or related fieldPhD in Computer Science, Artificial Intelligence, Machine Learning, Information Retrieval, Data Science or related field Experience in RAG, LLM Reasoning, and LLM Agent Experience working in a complex organization with multiple collaborators, strong track record in scaling and launching projects in this setting. In our team, you will be leveraging and improving upon the latest LLM/ML techniques in order to understand queries, rank user intents, rank documents, and generate answers to users' questions.