Amazon
Applied Scientist, Core Search
$143K–$193K
Seattle, WA · Full-time · Posted Jun 18, 2026
- Experience
- 4+ years with a Master's degree; alternatively, a PhD is required.
- Education
- PhD, or Master's degree and 4+ years of CS, CE, ML or related field experience
About the job
Develop and improve Amazon’s LLM-powered search stack, from model training and alignment to product retrieval, ranking, and online experimentation.
What you'll do
- Develop personalized multimodal LLMs and train or align models on shopping data using techniques such as RLHF and DPO.
- Build semantic product and customer representations, cross-attentive rankers, and multi-objective ranking systems.
- Improve performance through offline benchmarks and online experiments; help shape program strategy and investment priorities.
What they ask for
- PhD, or Master's degree and 4+ years of CS, CE, ML or related field experience
- Programming experience in Java, C++, Python or related language
- Experience in algorithms and data structures, parsing, numerical optimization, data mining, parallel and distributed computing, or high-performance computing
Nice to have
- Experience using Unix/Linux
- Experience in professional software development
Pay
142,800.00 - 193,200.00 USD annually (base salary)
Tools
Java, C++, Python, Unix/Linux, LLMs, RLHF, DPO
AI focus
Train, align, and apply reasoning LLMs, embedding models, and rankers for natural-language shopping search, personalization, and product recommendations.
Model-written summary · the original posting is authoritative