eBay · Growth marketing
Which marketing spend actually brings new buyers
A/B tests and incrementality studies for paid search and coupons in three markets.
Kasmi Data & AI · Zürich
Lamia Kasmi, PhD
Senior Data Scientist and AI Consultant
Eight years at eBay across growth measurement, personalisation, search and LLM systems for 130 million users. I help teams get answers they can defend, as a consultant on focused projects or as a senior scientist joining the right team.
- PhD, ETH Zürich · ultrafast laser physics
- MSc Applied Physics, EPFL
- Applied ML and AI
- English · French · German
What I work on
Measurement and experimentation
Incrementality, A/B testing and attribution that tell you which spend actually causes sales.
Search, LLM and agent systems
Retrieval, evaluation and tracing, so AI features hold up for every user, not just the demo.
ML for science and industry
Models and optimisation for laser, photonics and other physical processes.
Selected work
eBay · AI assistant
An AI shopping assistant customers can rely on
Answerability raised to 89%, resolution to 92%, and 8× click-through on personalised prompts.
eBay · Retention
Knowing which customers are about to leave
A churn model scoring all 130 million customers every day, owned end to end.
Latest writing
- Linear Regression Isn't Always a Straight LineWhy adding x² keeps a model linear, and how the same idea connects feature engineering, kernels and neural networks.
- What Building a Conversational Shopping Assistant Taught Me About Shipping LLMsThe failures behind a production LLM search assistant, and the engineering habits they forced: evaluation gates, versioning and joined-up observability.