Join Siri as the Engineering Leader of the Planner Modeling Team and play an important role in redefining the Siri experience. You will collaborate with senior leaders and cross-functional partners to develop the core model that drives the agent’s behavior, determining when and how to call tools on the users behalf. In this role you will work at the forefront of what is currently possible with LLMs, working with simulation, evaluation, context engineering, and data generation. This role requires collaboration across teams, including teams building our agent’s “toolbox”, search, and close partners with Response Generation and Internationalization. Work closely with our Architecture Committee and the Evaluation Infrastructure team to align on strategic directives and leverage simulator-driven evaluations to measure and improve model quality. Engage in benchmarking state-of-the-art internal and external models and perform failure analyses to understand common failure patterns and gain exposure to cutting edge technologies and techniques.