Applied AI/ML Researcher — Causal Inference for Ecommerce

eBay; Toronto; On-site; CAD 120,000 - 180,000; Full time

Job summary

eBay’s AI/ML team within the Selling organization is seeking an Applied Researcher to design and advance our research agenda across machine learning and generative AI. You will contribute to price guidance modeling and the expanding selling-agent platform, translating research findings into seller-facing features used across eBay’s global marketplace.

You’ll collaborate with Product, Engineering, and Data teams to deliver production-ready systems with measurable business impact, balancing

Qualifications

• PhD or MS with strong ML research background.
• Proven ability to design and run ML experiments.
• Experience deploying ML systems to production.
• Strong programming and data engineering skills.

Responsibilities

• Design and advance ML/generative AI research agenda.
• Translate research findings into seller-facing features.
• Collaborate with Product, Engineering, and Data teams.
• Ensure performance, reliability, and measurable business impact.
• Own KPIs for deployed systems.

Skills

Causal Inference

Gradient Boosting

Prompt Engineering

LLM Deployment

LLM Evaluation

Agentic Systems

Python

LangChain

Research to Production

Education

PhD in CS/ML or related

MS + 5+ years applied ML

Tools

LightGBM

XGBoost

CatBoost

Python

LangChain

PyArrow

Pandas/Polars

Job description

eBay’s AI/ML team within the Selling organization is seeking an Applied Researcher to design and advance our research agenda across machine learning and generative AI. You will contribute to price guidance modeling and the expanding selling-agent platform, translating research findings into seller-facing features used across eBay’s global marketplace.

You’ll collaborate with Product, Engineering, and Data teams to deliver production-ready systems with measurable business impact, balancing