Machine Learning Engineer

Apple; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

Apple is seeking a Machine Learning Engineer focused on Evaluation & Insights for the Human-Centered AI team. You will bridge human perception and model performance, evaluating Foundation Models and generative AI systems, and architect evaluation frameworks.

You will work with Data Scientists, Researchers, and Engineers to ensure AI experiences are reliable, safe, and aligned with human expectations across products like search and recommendations.

Qualifications

• Bachelor’s or Master’s degree in a relevant technical field with ML experience.
• Advanced Python and DL ecosystems experience.
• Ability to interpret unstructured model outputs and synthesize findings into actionable guidance.
• Hands-on experience with LLMs, multimodal models, and NLP systems.
• Familiarity with AI quality metrics, RLHF/DPO, and LLM evaluation frameworks.

Responsibilities

• Lead rigorous evaluations of LLMs and multimodal models, spotting edge cases.
• Develop evaluation frameworks and scoring methods for quality metrics.
• Translate failure modes into actionable data and guardrails.
• Collaborate with engineers to improve model behavior via prompts and RAG.
• Map error patterns using advanced ML techniques.
• Build MLOps workflows to codify metrics and automate tests.
• Create distributed pipelines for high-throughput evaluation.
• Define human-centric metrics like trust calibration and interpretability.
• Develop auto-evaluator systems using LLMs.
• Partner with ML researchers, software, and product managers across Apple.

Skills

Python

PyTorch

JAX

Hugging Face

NLP evaluation

Education

Bachelor’s or Master’s in CS/ML/AI/Cognitive Science

Tools

MLflow

Weights & Biases

Job description

Summary

Imagine what you could do here. At Apple, great new ideas have a way of becoming extraordinary products, services, and customer experiences very quickly. Bring passion and dedication to your job and there's no telling what you could accomplish! Are you passionate about music, movies, and the world of Artificial Intelligence and Machine Learning? So are we! Join our Human-Centered AI team for Apple Media Services. In this role, you'll represent the user perspective on new features, review and analyze data, and evaluate AI models powering everything from search and recommendations to other innovative features. Collaborate with Data Scientists, Researchers, and Engineers to drive improvements across our platforms.

Description

We are looking for a Machine Learning Engineer focused on Evaluation & Insights for the Human-Centered AI team. In this role, you will bridge the gap between human perception and algorithmic performance, helping evaluate and optimize Foundation Models and generative AI systems. You will architect robust evaluation frameworks, design scalable MLOps pipelines for model assessment, and translate qualitative failure modes into programmatic guardrails and training signals (e.g., SFT, RLHF/DPO). This role blends deep ML engineering expertise with strong analytical judgment to assess, interpret, and improve the behavior of advanced AI models. You will work cross-functionally with Software Engineering, Product, Research and Responsible AI teams at Apple to ensure that our AI experiences are reliable, safe, and aligned with human expectations.

Responsibilities

• Lead Rigorous Model Evaluations: Architect and execute comprehensive evaluation suites for LLMs and multimodal models, identifying edge cases in multi-step reasoning, factuality, adversarial robustness, safety, and alignment.
• Advanced Scoring Frameworks: Develop deterministic, heuristic, and LLM-assisted evaluation frameworks (e.g., LLM-as-a-judge, reward modeling) to quantify human-perceived quality metrics (e.g., helpfulness, hallucination rates).
• Actionable Signal Extraction: Translate qualitative failure modes into quantifiable loss patterns, programmatic guardrails, and actionable data-mixture adjustments for model training and inference.
• Improve Performance: Partner with engineering teams to refine model behavior, leveraging evaluation telemetry to inform prompt engineering, Retrieval-Augmented Generation (RAG) strategies, and model fine-tuning.
• Latent Pattern Recognition: Apply advanced ML techniques (e.g., embedding-based clustering, representation learning, perturbation analysis) to systematically map error taxonomies and latent failure manifolds in model outputs.
• MLOps & Automation: Develop robust MLOps workflows to codify evaluation metrics, automate regression testing across model checkpoints, and integrate human-centric assessments into ML CI/CD pipelines.
• Distributed Evaluation Pipelines: Architect scalable, distributed inference and processing pipelines (e.g., Ray, vLLM) for high-throughput model evaluation, automated annotation, and output analysis at scale.
• Human-Centric Metrics: Define quantitative evaluation frameworks that capture nuanced human factors, including trust calibration, conversational state tracking, and interpretability.
• Auto-Evaluator Systems: Build automated evaluation pipelines utilizing LLMs to assess outputs at scale, optimizing for high correlation with human baseline annotations.
• Cross-Functional Partnership: Collaborate with ML researchers, software developers, and product managers across Apple to translate product requirements into scalable, reliable, and efficient model evaluation infrastructure.

Minimum Qualifications

• Bachelor’s or Master’s degree in Computer Science, Machine Learning, Artificial Intelligence, Cognitive Science, or a related technical field, with relevant industry experience in ML Engineering or Applied Research.
• Advanced proficiency in Python and modern deep learning ecosystems (PyTorch, JAX, Hugging Face).
• Strong ability to interpret unstructured model outputs (text, transcripts, embedding spaces) and synthesize qualitative findings into actionable engineering guidance and training objectives.
• Hands‑on experience developing, fine‑tuning, or evaluating LLMs, multimodal models, and NLP systems.
• Deep familiarity with AI quality metrics, hallucination detection techniques (e.g., SelfCheckGPT), model alignment (RLHF/DPO), and LLM-as-a-judge frameworks (e.g., G‑Eval, DeepEval).

Preferred Qualifications

• Knowledge of human factors, HCI, or cognitive science methodologies as applied to AI system design.
• Proven experience building scalable ML inference pipelines, model‑evaluation workflows, and structured rating frameworks for large-scale AI systems.
• Experience building internal tools or automated pipelines for ML workflows using tools like MLflow, Weights & Biases, or similar platforms.
• Strong familiarity with advanced prompt engineering, RAG architectures (vector databases, semantic search), and Fine‑Tuning.

At Apple, we're not all the same. And that's our greatest strength. We draw on the differences in who we are, what we've experienced and how we think. Because to create products that serve everyone, we believe in including everyone. Therefore, we are committed to treating all applicants fairly and equally. As a registered Disability Confident employer, we will work with applicants to make any reasonable accommodations. Apple will consider for employment all qualified applicants with criminal backgrounds in a manner consistent with applicable law.

Learn more

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Role Number: 200666780-2114