Principal Machine Learning Engineer, AI & Data Platforms (AiDP)

Apple Inc.

NEW ADDINGTON, UNITED KINGDOM · GB

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Full-time

PRINCIPAL

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About the Role

Apple's AI & Data Platforms team seeks a Principal Machine Learning Engineer to lead LLM design, fine-tuning, evaluation, and productionization at global scale. This role combines research, engineering, and product building to deliver generative AI systems.

Responsibilities

Lead end-to-end development of LLM-based systems from training to deployment; design LLM evaluation frameworks; architect production inference infrastructure; drive model customization strategies; build AI-powered products across Swift, Java, and Python.

Requirements

Extensive ML engineering experience shipping ML products at scale; deep expertise in LLM fine-tuning, alignment, and evaluation; strong software engineering in Python, Swift, Java; experience with enterprise ML pipelines and cloud platforms.

Nice to Have

Published papers in top ML conferences; experience with pre-training LLMs; expertise in RLHF, RLAIF, agentic frameworks (LangChain, LangGraph), multimodal AI; inference optimization; technical leadership.

Tech Stack

PythonPyTorchAWSAzure

Apple Inc.

Cupertino · US · 80000+ employees

Apple designs consumer electronics, software, and related services. Apple’s corporate communications highlight its large global workforce and its operations centered around Apple Park in Cupertino.