The Senior Machine Learning Engineer specializing in Conversational AI will join the SCALE team at Apple, focusing on evaluating and improving Siri and AI/ML models. This role involves collaborating with cross-functional teams to curate high-quality evaluation datasets and delivering insights that enhance user experiences while adhering to privacy standards. The position offers a unique opportunity to work at the intersection of advanced AI and human-centered design. Candidates will tackle challenges related to personalized user experiences and contribute to the development of state-of-the-art models.

• 7+ years of professional experience applying machine learning to real-world problems and crafting scalable data solutions, specifically in natural language products.
• Proven experience managing large-scale datasets for ML training and/or evaluation.
• Excellent programming skills in Python.
• MS/PhD in Machine Learning, Computer Science, or equivalent experience in a related field.
• Deep domain knowledge in Conversational AI and a strong understanding of the end-to-end ML product lifecycle.
• Expertise in defining and measuring evaluation coverage for Large Language Models (LLMs) and agentic systems.

• Collaborate with cross-functional teams to curate and evolve high-quality evaluation datasets for state-of-the-art models.
• Deliver offline evaluation insights that drive model development and improve the end-user experience.
• Tackle novel challenges in evaluating highly personalized user experiences.
• Ensure adherence to Apple's strict privacy standards in all evaluations.
• Drive alignment across teams through excellent problem-solving, critical thinking, and communication skills.

• 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.