Music Annotation Jobs in California (NOW HIRING)

Apple Services Engineering (ASE) powers many AI features across App Store, Music, Video and more. We build deeply personal products with the goal of representing users around the globe authentically. We work continuously to avoid perpetuating systemic biases and maintain safe and trustworthy experiences across our AI tools and models.
Our team, part of Apple Services Engineering, is looking for an ML Research Engineer to lead the design and continuous development of automated safety benchmarking methodologies. In this role, you will investigate how media-related agents behave, develop rigorous evaluation frameworks and techniques, and establish scientific standards for assessing risks they pose and safety performance. This role supports the development of scalable evaluation techniques that ensure our engineers have the right tools to assess candidate models and product features for responsible and safe performance. The capabilities you build will allow for the generation of benchmark datasets and evaluation methodologies for model and application outputs, at scale, to enable engineering teams to translate safety insights into actionable engineering and product improvements. This role blends deep technical expertise with strong analytical judgment to develop tools and capabilities for assessing and improving the behavior of advanced AI/ML models. You will work cross-functionally with Engineering and Project Managers, Product, and Governance teams to develop a suite of technologies to ensure that AI experiences are reliable, safe, and aligned with human expectations.The successful candidate will take a proactive approach to working independently and collaboratively on a wide range of projects. In this role, you will work alongside a small but impactful team, collaborating with ML and data scientists, software developers, project managers, and other teams at Apple to understand requirements and translate them into scalable, reliable, and efficient evaluation frameworks.
Advanced degree (MS or PhD) in Computer Science, Software Engineering, or equivalent research/work experience1+ years of work experience either as a postdoc or in the industryStrong research background in empirical evaluation, experimental design, or benchmarkingStrong proficiency in Python (pandas, NumPy, Jupyter, PyTorch, etc.)Deep familiarity with software engineering workflows and developer toolsExperience working with or evaluating AI/ML models, preferably LLMs or program synthesis systemsStrong analytical and communication skills, including the ability to write clear reportsTechnical Skills:Proficiency in Python (pandas, NumPy, Jupyter, PyTorch, etc.).Experience working with large datasets, annotation tools, and model evaluation pipelinesFamiliarity with evaluations specific to responsible AI and safety, hallucination detection, and/or model alignment concernsAbility to design taxonomies, categorization schemes, and structured labeling frameworksAnalytical Strength: Ability to interpret unstructured data (text, transcripts, user sessions) and derive meaningful insightsCommunication: Strong ability to stitch together qualitative and quantitative insights into actionable guidance; strong ability to communicate complex architectures and systems to a variety of stakeholdersEducation in Data Science, Linguistics, Cognitive Science, HCI, Psychology, Social Science, or a related field
Publications in AI/ML evaluation or related fieldsExperience with automated testing frameworksExperience constructing human-in-the-loop or multi-turn evaluation setupsIntermediate or Advanced Proficiency in Swift Familiarity with RAG systems, reinforcement learning, agentic architectures, and model fine-tuningExpertise in designing annotation guidelines and validation instruments and techniquesBackground in human factors, social science, and/or safety assessment methodologies