Hiring: Applied Scientist - Agentic AI, Amazon Fulfillment Technology AI Science Company: Amazon Location: Bellevue, WA Job Posted Time: 2026-09-17 00:01:31 Target Skills & Keywords : C++, Fine-tuning, Java, LLM, Linux, Python, RAG, Reinforcement Learning About the job Experience: •4+ years of CS, CE, ML or related field experience •3+ years of building models for business application experience Required Skills: •Generating training and preference data for specific use cases (reasoning trajectories, tool traces) •Reward modeling and policy optimization for LLMs: DPO, IPO, RLHF/RLAIF with PPO/GRPO, rejection sampling. •Supervised fine-tuning on step-by-step trajectories and tool-use traces •Verbal Reinforcement Learning and Continual Learning •RL for LLMs, Offline RL and off-policy evaluation •Agentic memory/state management; episodic and semantic memory; vector search; grounding with RAG. •Evaluation: developing decision quality metrics, scaling LLM-based evaluations. Qualifications: •PhD, or Master's degree and 4+ years of CS, CE, ML or related field experience •3+ years of building models for business application experience •Experience programming in Java, C++, Python or related language •Proven hands-on experience in any of the following areas: algorithms and data structures, parsing, numerical optimization, data mining, parallel and distributed computing, high-performance computing •Proven hands-on experience in professional software development Interested candidates, please apply directly through the job posting on company's career page or try via AI auto apply on this platform. Don't miss this opportunity to join a forward-thinking team!