Senior Machine Learning Engineer, Apple Search & Knowledge Platforms

**Role Number:** 200641779-3337 **Summary** The AI, Search & Knowledge Platforms team builds amazing products and services for Apple's customers while serving as a foundational partner to teams across Apple. The team delivers world-class AI, search, and knowledge systems powering Siri, Apple Intelligence, Safari, and iMessage, and operates the foundational platforms and infrastructure that keep these intelligent experiences running at hyperscale. As part of this group, you will be doing large scale machine learning and deep learning research and development to improve Open Domain Question Answering (using both structured knowledge graph data and unstructured web data) and Summarization as well as developing fundamental building blocks needed for Artificial Intelligence. This involves developing sophisticated machine learning and large language models (LLMs) to understand user queries, retrieve and rank relevant documents across multiple sources and synthesize information across documents to provide user with a direct answer that best satisfies their intent and information seeking needs. Additionally, you will research and develop the state-of-the-art LLMs for summarizing personal data such as emails, messages, and notifications. You will also work with researchers and data scientists to develop, fine-tune, and evaluate domain specific Large Language Models for various tasks and applications in Apple's AI powered products and conduct applied research to transfer the cutting edge research in generative AI to production ready technologies. **Description** As a member of our fast-paced group, you'll have the unique and rewarding opportunity to shape upcoming products from Apple. We are looking for highly motivated machine learning engineers and researchers having strong machine learning and deep learning fundamentals with hands-on experience in fine-tuning deep learning and large language models. **Minimum Qualifications** + 2+ years of experience working with Deep learning or LLM model development for various NLP tasks and RAG applications including prompt engineering, training data collection and generation, model fine-tuning and model evaluation. + Experience working with Python and at least one of the deep learning frameworks such as TensorFlow, PyTorch, or JAX. + Master's in Computer Science, Artificial Intelligence, Machine Learning, or a related field. **Preferred Qualifications** + PhD in Computer Science, Artificial Intelligence, Machine Learning, or a related field. + 4+ years of experience with large-scale model training, optimization, and deployment + One or more scientific publications in various conferences and journals + Outstanding communication and interpersonal skills with ability to work with cross-functional teams. + 1+ year of experience in various state-of-the-art techniques related to LLM fine-tuning in 1 or more of the following areas: + Supervised Fine-tuning (SFT) with Rejection Sampling + Preference-based fine-tuning techniques (e.g RLHF, Reward model, DPO, PPO, GRPO etc.) + Parameter efficient fine-tuning techniques (e.g LoRA) + Hallucination reduction and factual accuracy improvements + Designing and implementing safety guardrails