Machine Learning Engineer – Recommendations & Personalization (Feature Engineering)

Apple Services Engineering is seeking a Machine Learning Engineer specializing in Recommendations & Personalization. This role involves designing, optimizing, and deploying end-to-end recommendation flows, including feature engineering, model training, real-time inference, and feedback loops. The engineer will also prototype and build next-generation LLM-powered and agentic recommendation concepts, collaborating with researchers and infrastructure engineers to deliver production-grade ML systems and exploratory generative architectures. This high-impact role bridges robust system design with forward-looking research to craft unparalleled user experiences.

Must Have

• BS, MS or PhD in Computer Science, Machine Learning, or a related technical field
• 4+ years of hands-on experience developing and deploying production-grade ML systems for personalization, ranking, or recommendation
• Strong software engineering skills in Go, Rust, Java, Python, or similar languages, with a focus on scalable, high-performance, and reliable services
• Extensive experience with distributed data and ML systems (e.g., Ray, Spark) and model lifecycle management
• Deep understanding of recommendation model architectures, inference optimization techniques, and practical feedback loop implementations
• Demonstrated experience designing, implementing, and analyzing A/B tests or advanced online evaluation frameworks
• Strong commitment to system reliability, observability, and ultra-low latency in large-scale ML environments

Good to Have

• Strong theoretical understanding and hands-on experience in agent development, LLM fine-tuning, or post-training optimization
• Familiarity with or practical experience using modular LLM tooling frameworks such as LangGraph, LangChain
• Background in feature store design, embedding systems, or advanced vector retrieval techniques for recommendation pipelines
• Expertise in real-time inference, autoscaling strategies, traffic shaping, and cost-performance optimization for ML services
• Experience deploying and managing ML workloads on Kubernetes or other containerized environments
• Exposure to reinforcement learning, multi-objective ranking, or generative retrieval architectures
• Prior work experience in large consumer media or content recommendation domains

Perks & Benefits

• Comprehensive medical and dental coverage
• Retirement benefits
• Range of discounted products and free services
• Reimbursement for certain educational expenses, including tuition
• Opportunity to become an Apple shareholder through discretionary employee stock programs
• Opportunity to purchase Apple stock at a discount via Employee Stock Purchase Plan
• Eligibility for discretionary bonuses or commission payments
• Eligibility for relocation

Apple Services Engineering embodies Apple's deep commitment to uniting creativity with technology. Our team powers flagship services—including the App Store, Games, Apple Arcade, Apple TV, Apple Music, Apple Podcasts, and Apple Books—delivering world-class entertainment and experiences to users worldwide across a diverse set of global languages. Through relentless pursuit of excellence and innovation at scale, we consistently meet Apple's high standards for quality and performance. Our engineers design and scale the machine learning systems that make Apple’s services feel uniquely personal. We are now pioneering the next generation of recommendation architectures — blending traditional ranking models with cutting-edge generative and agent-driven intelligence to create adaptive, context-aware, and delightful user experiences. If you are excited about advancing recommendation technology at massive scale — and about exploring how Large Language Models (LLMs), advanced retrieval, and modular ML systems can reshape personalization — we'd love to meet you.

As a Machine Learning Engineer specializing in Recommendations & Personalization, you will be a pivotal contributor at the intersection of robust ML infrastructure, innovative recommendation systems, and emerging generative AI technologies. You will design, optimize, and deploy end-to-end recommendation flows — spanning sophisticated feature engineering, model training, real-time inference, and feedback loops. Simultaneously, you will prototype and build next-generation LLM-powered and agentic recommendation concepts that push the boundaries of what's possible. You will partner closely with applied researchers, infrastructure engineers, and data scientists to bring both production-grade ML systems and exploratory generative architectures to life. This is a hands-on, high-impact engineering role that bridges robust system design with forward-looking research and a passion for crafting unparalleled user experiences.

• Pioneer Generative Architectures: Collaborate with research teams to prototype, evaluate, and integrate LLM-driven or generative recommendation architectures, encompassing retrieval, sophisticated ranking, and conversational understanding.
• Build Scalable ML Platform: Develop modular ML infrastructure and tooling that accelerates experimentation, safe deployment, and continuous integration—including robust model serving, versioning, rollback strategies, and online evaluation frameworks.
• Craft High-Performance Services: Design, build, and maintain low-latency, high-throughput inference services in Go, Rust, Java, Python, or similar programming languages, operating at Apple's immense scale.
• Optimize Recommendation Pipelines: Engineer, implement, and optimize large-scale recommendation and personalization pipelines, including both efficient batch processing and ultra-responsive real-time serving systems.
• Advance Feature Engineering: Design and implement robust data and feature pipelines, including support for online feature stores, streaming updates, and real-time feature generation.
• Enhance System Reliability: Partner with infrastructure teams to elevate system observability, reliability, and performance optimization across critical recommendation workloads.
• Drive Model Evaluation: Lead the design and execution of A/B tests and continuous online evaluation of personalization models, ensuring alignment with product goals and measurable user impact.
• Explore Agentic Systems: Participate in exploratory initiatives around agentic orchestration frameworks (e.g., LangGraph, LangChain) and their transformative application to adaptive recommendation workflows.

• BS, MS or PhD in Computer Science, Machine Learning, or a related technical field.
• 4+ years of hands-on experience developing and deploying production-grade ML systems for personalization, ranking, or recommendation.
• Strong software engineering skills in Go, Rust, Java, Python, or similar languages, with a proven focus on building scalable, high-performance, and reliable services.
• Extensive experience with distributed data and ML systems (e.g.,Ray, Spark) and model lifecycle management.
• Deep understanding of recommendation model architectures, inference optimization techniques, and practical feedback loop implementations.
• Demonstrated experience designing, implementing, and analyzing A/B tests or advanced online evaluation frameworks.
• A strong commitment to system reliability, observability, and ultra-low latency in large-scale ML environments.

• Strong theoretical understanding and hands-on experience in agent development, LLM fine-tuning, or post-training optimization.
• Familiarity with or practical experience using modular LLM tooling frameworks such as LangGraph, LangChain.
• Background in feature store design, embedding systems, or advanced vector retrieval techniques for recommendation pipelines.
• Expertise in real-time inference, autoscaling strategies, traffic shaping, and cost-performance optimization for ML services.
• Experience deploying and managing ML workloads on Kubernetes or other containerized environments.
• Exposure to reinforcement learning, multi-objective ranking, or generative retrieval architectures.
• Prior work experience in large consumer media or content recommendation domains.

At Apple, base pay is one part of our total compensation package and is determined within a range. This provides the opportunity to progress as you grow and develop within a role. The base pay range for this role is between $171,600 and $302,200, and your base pay will depend on your skills, qualifications, experience, and location.

Apple employees also have the opportunity to become an Apple shareholder through participation in Apple’s discretionary employee stock programs. Apple employees are eligible for discretionary restricted stock unit awards, and can purchase Apple stock at a discount if voluntarily participating in Apple’s Employee Stock Purchase Plan. You’ll also receive benefits including: Comprehensive medical and dental coverage, retirement benefits, a range of discounted products and free services, and for formal education related to advancing your career at Apple, reimbursement for certain educational expenses — including tuition. Additionally, this role might be eligible for discretionary bonuses or commission payments as well as relocation. Learn more about Apple Benefits.

Note: Apple benefit, compensation and employee stock programs are subject to eligibility requirements and other terms of the applicable plan or program.

Apple is an equal opportunity employer that is committed to inclusion and diversity. We seek to promote equal opportunity for all applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, Veteran status, or other legally protected characteristics. Learn more about your EEO rights as an applicant

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Apple accepts applications to this posting on an ongoing basis.