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Principal Applied Scientist

United States, Washington, Redmond💼 Full-time🗓 2026-04-29 → 2026-10-02

Core

Design, build, and productionize machine learning models for product discovery, ranking, recommendation, and personalization; develop LLM-based systems for conversational shopping.

Role type

Principal Applied Scientist (LLMs & Recommendation Systems) (via careerplan.io/jobs/1970393556861123-principal-applied-scientist-at-microsoft)

Builds

Low-latency, reliable Copilot shopping experiences and conversational shopping systems

Domain

E-commerce, Retail, Large-scale Data

Deliverable

production ML models

Required skills

Machine learning model development, LLM prompt engineering, Retrieval-augmented generation (RAG), Tool orchestration, Time-series analysis, Anomaly detection, Python, SQL, Apache Spark, Azure Databricks, Experimentation design, Model governance

Preferred skills

Responsible AI practices, Hallucination mitigation, Offline metrics definition, Mentoring

Technologies

Python, R, SQL, Apache Spark, Azure Databricks, GPT-like models

Responsibilities

Define evaluation frameworks and experimentation strategies for conversational shopping scenarios, Partner with product and engineering teams to translate models into production systems, Provide technical leadership through design reviews and mentoring, Contribute to model governance and Responsible AI practices

Seniority

Principal, hands-on IC with strategic leadership