Sr. Machine Learning Engineer – LLMs, Agent Systems, and Simulation Tooling, Siri Core Modeling jobs in United States
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Apple · 4 months ago

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

positionSunnyvale, California, United States
timeFull-time
remoteOnsite
seniorityMid, Senior Level
money$147K/yr - $272K/yr
date4+ years exp

Apple is a leading technology company known for its innovative products and services. As a Senior Machine Learning Engineer, you will help define how next-generation intelligent agents reason, plan, and interact with people, developing scalable LLM reasoning systems that enhance human-AI interaction.

AppsArtificial Intelligence (AI)BroadcastingDigital EntertainmentFoundational AIMedia and EntertainmentMobile DevicesOperating SystemsTVWearables
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Comp. & Benefits
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H1B Sponsor Likelynote

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

Qualification

PythonML engineeringAgent-based simulationLLM evaluation methodologiesClient-backend integrationReinforcement learningAdaptive feedback loopsSystem designSoft skills

Required

Bachelor's degree in Computer Science, Machine Learning, or related quantitative field, with 4+ 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

Preferred

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

Benefits

Comprehensive medical and dental coverage
Retirement benefits
A range of discounted products and free services
Reimbursement for certain educational expenses — including tuition
Discretionary bonuses or commission payments
Relocation

Company

Apple

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Apple is a technology company that designs, manufactures, and markets consumer electronics, personal computers, and software.
dateFounded in 1976
location
Cupertino, California, USA
people-size10001+ employees
web-link
https://www.apple.com

H1B Sponsorship

Apple has a track record of offering H1B sponsorships. Please note that this does not guarantee sponsorship for this specific role. Below presents additional info for your reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (6998)
2024 (3766)
2023 (3939)
2022 (4822)
2021 (4060)
2020 (3656)

Funding

Current Stage
Public Company
Total Funding
$5.67B
Key Investors
Berkshire HathawayMicrosoftSequoia Capital
2025-05-05Post Ipo Debt· $4.5B
2025-01-16Post Ipo Debt· $0.31M
2021-04-30Post Ipo Equity

Leadership Team

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Tim Cook
CEO
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Craig Federighi
SVP, Software Engineering

Recent News

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Company data provided by crunchbase