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Machine Learning Engineer – LLMs, Agent Systems, and Simulation Tooling, Siri Core Modeling

Apple· Siri / Apple AI
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Hybrid (Cupertino, CA)$150.4k - $277.6kfull-timePosted 2w ago

About the role

Senior Machine Learning Engineer role within the Siri organization focused on designing scalable LLM reasoning, agent-based systems, and simulation tooling to power voice-first, multimodal assistant experiences across Apple platforms.

Responsibilities

  • Design and implement scalable simulation and evaluation frameworks for LLM-based agents
  • Collaborate with ML researchers to translate novel reasoning approaches into production-grade systems
  • Develop infrastructure for training and experimentation with agentic behaviors
  • Integrate agent reasoning capabilities into client-side and backend environments
  • Drive iteration speed by creating reliable tooling for experimentation, prototyping, and deployment

Qualifications

  • Bachelor’s degree in Computer Science, Machine Learning, or related quantitative field, with 3+ years of relevant industry experience
  • Strong skills in Python (preferred) and at least one other programming language
  • Proven experience in ML engineering, including system design, training pipelines, and deployment workflows
  • Deep understanding of agent-based simulation, agentic RAG systems, and LLM evaluation methodologies
  • Ability to balance long-term platform vision with pragmatic short-term delivery in fast-paced environments
  • Experience deploying LLM models in research or production contexts
  • Knowledge of adaptive feedback loops, reinforcement learning, or interactive agent design
  • Familiarity with client-backend integration for AI-driven applications
  • MS or PhD in Computer Science, Machine Learning, or a related field

Skills

Required:PythonLLM developmentAgent-based simulationSystem design and deployment pipelines
Nice to have:Client-backend integration

Benefits

  • Comprehensive medical and dental coverage
  • retirement benefits
  • discounted products and free services
  • reimbursement for certain educational expenses (tuition)
  • discretionary bonuses or commission payments (potential)
  • relocation assistance
  • Apple Employee Stock Purchase Plan (ESPP)
  • discretionary employee stock units (RSUs) program
Last updated Oct 9, 2026. Interested? Apply on the company site.

About Apple

Discover the innovative world of Apple and shop everything iPhone, iPad, Apple Watch, Mac, and Apple TV, plus explore accessories, entertainment, and expert device support.

Discover the innovative world of Apple and shop everything iPhone, iPad, Apple Watch, Mac, and Apple TV, plus explore accessories, entertainment, and expert device support.

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