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Staff Machine Learning Performance Engineer

Apple

$212,000 - $318,400
Aug 21, 2025
Cupertino, CA, US
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Apple's Siri team is seeking to optimize and accelerate Large Language Models (LLMs) and other machine learning models to enhance the overall user experience and improve performance and efficiency.

Requirements

  • Understanding of Transformer and LLM architectures.
  • Strong understanding of Operating System, Compiler and Computer Architecture fundamentals.
  • Expertise in optimizing software for take advantage of underlying hardware architecture.
  • Experience in analyzing, identifying, and optimizing performance bottlenecks.
  • Strong plus if you have expertise in optimizing model architectures for on device inference.
  • Strong plus if you have previously worked with modeling pipeline teams in model deployment and promotion pipelines.
  • PhD in related field

Responsibilities

  • Analyze and optimize the performance of machine learning models and systems used by Siri.
  • Develop and implement strategies for model tuning, parameter optimization, and efficient resource usage.
  • Conduct performance benchmarking and develop tooling and metrics to measure model performance in terms of compute, memory and latency.
  • Collaborate with feature and product teams to consult on modeling decisions to achieve Siri performance objectives.
  • Collaborate with hardware and software teams to integrate research findings into product implementation.
  • Consult with multiple product teams to determine the appropriate foundation model (On Device vs Server) for their use cases and to help them achieve their accuracy and performance targets.
  • Lead efforts in identifying bottlenecks and optimizing our model inference stack.

Other

  • Bachelors degree in Computer Science, Engineering, or related discipline, or 10+ equivalent industry experience
  • Excellent communication skills
  • Creative, collaborative, and product-focused.
  • 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.
  • Discretionary restricted stock unit awards, and can purchase Apple stock at a discount if voluntarily participating in Apple’s Employee Stock Purchase Plan.