Senior LLM Post-Training Research Engineer

Apple; New York (NY); On-site; USD 180,000 - 240,000; Full time

Job summary

Apple Translation & Multilingual Intelligence is seeking researchers to advance Foundation Models enabling cross-language communication and privacy-forward experiences across Apple products. You will work on instruction following, tool use, deep reasoning, and architectural adaptation with a world-class team.

Join us to build multilingual, scalable models for billions of users, shaping evaluation methodologies and data strategies while collaborating with product teams to translate requirements

Qualifications

• 4+ years of ML/NLP experience with a focus on LLMs or RL.
• Proficient in Python; experience with JAX or PyTorch.
• Masters/PhD or equivalent in CS/ML or related field.

Responsibilities

• Interface with product teams to translate requirements into model capabilities and improve observed loss patterns.
• Drive data strategy for high-quality data generation and filtering to improve multilingual responses and locale coverage.
• Design robust evaluation methodologies to measure model helpfulness, factuality, and utility.
• Develop end-to-end post-training strategies to unlock specific model behaviors.

Skills

Python

NLP

LLMs

Reinforcement learning

Education

Masters/PhD in CS/ML

Tools

JAX

PyTorch

Job description

Apple Translation & Multilingual Intelligence is seeking researchers to advance Foundation Models enabling cross-language communication and privacy-forward experiences across Apple products. You will work on instruction following, tool use, deep reasoning, and architectural adaptation with a world-class team.

Join us to build multilingual, scalable models for billions of users, shaping evaluation methodologies and data strategies while collaborating with product teams to translate requirements