The Principal Applied Research Engineer will be part of the Siri organization, focusing on breakthrough innovation in self-improving systems and deeply personalized autonomous multi-agent systems. This role involves shaping next-generation intelligent architectures that learn continuously and reason over persistent memory. The engineer will integrate foundational AI research with advanced machine learning to enhance user experiences across Apple's product ecosystem. This position offers a unique opportunity to influence high-level architecture decisions and advocate for novel research directions.

• MSc or PhD in Computer Science, Machine Learning, or a related field, or equivalent practical experience in LLM productization.
• Deep expertise in transformer-based LLMs and multi-modal foundation models, particularly in integrating text, vision, and audio.
• Hands-on mastery across the model lifecycle, including pre-training, fine-tuning, performance optimization, and safety alignment.
• Expertise in designing AI agents for complex reasoning while addressing on-device compute constraints.
• Demonstrated ability to influence high-level architecture decisions and advocate for research directions.

• Drive breakthrough innovation across self-improving systems and agentic memory.
• Shape next-generation intelligent architectures that learn continuously and retain memory.
• Coordinate across agents to enhance multi-agent system capabilities.
• Translate frontier research into scalable product experiences.
• Redefine user experiences through advanced machine learning applications.

• Employees at Apple are often offered comprehensive benefits that support physical and mental well-being—flexible medical plans, confidential counseling, onsite wellness centers at major campuses, and resources for fitness and daily life. Families typically receive fertility support, paid parental leave with gradual return, caregiving leave, and dependent-care guidance, while financial perks commonly include stock grants (with purchase discounts), 401(k) matching, and income-protection coverage. Employees also see robust time off, Apple University learning and tuition reimbursement, donation matching and paid volunteer hours, and deep product and partner discounts.