About
ML researcher & builder · Exa
Bartosz Dzionek · BAR-tosh JOH-nek · [ˈbartɔʂ ˈd͡ʑɔ.nɛk]
I’m a machine learning researcher at Exa, working on ranking models for agentic search. Before Exa, I built a SOTA reranker at Google’s Gemini Enterprise. What ties my work together is a slightly obsessive interest in infinite knowledge — AI that can find any information that has ever existed.
Outside of work, I really enjoy reading about psychology and history, and drinking tons of iced coconut lattes. I am also an avid traveller — this map tracks the places I visited.
I created this page because I love to learn and teach. I started writing here to think out loud about search, ranking, and language models. Hope you enjoy following along!
In short
Work
- 2026 —
Machine Learning Researcher · Exa Ranking models for agentic search. - 2023–26
Machine Learning Engineer · Google Reranking at Gemini Enterprise.
Education
- 2019–23
BSc (Hons), Artificial Intelligence · University of Edinburgh Thesis on the low-rank softmax bottleneck. - 2021–22
Exchange year, Data Science · ETH Zürich Perhaps the hardest ML courses on Earth.
ML conferences
- 2026 —
Reviewer · ICML Total: 13 papers 2026 workshops: AI4Good, AI4Science, CTB, CompLearn, TAIGR