Résumé
The work, condensed.
Highlights of a decade in data science. The full PDF is available on request.
Summary
Sr Staff Data Scientist with a decade of compounding impact across identity, e-commerce, sales analytics, and the data infrastructure underneath. Physics-trained. Multilingual. Globally curious.
Experience
- May 2026 – present
Sr Staff Data Scientist
Intuit · San Francisco, CA- Joined to take on the next hard problem in applied data science at scale.
- Nov 2022 – May 2026
Identities Data Science Tech Lead
Square / Block · San Francisco, CA- Generated 100K+ business-type and address-matching insights using Claude and GPT on Snowflake Cortex.
- Applied GooseAI and ChatGPT to CS ticket analysis, surfacing the patterns that reduced churn.
- Built a classification model uncovering $0.5M / year in fee exposure; ran A/B tests with diff-in-diff, segmented regression, and survival analysis.
- Authored the org-wide ETL template; championed Anomalo, Select Star, Growthbook, and data contracts (~50% analyst time savings).
- Served on the AI Steering Committee shaping the enterprise AI roadmap.
- Coached two direct reports through promotion; co-led the IC ladder and interview revamp.
- Jan 2022 – Nov 2022
Analytics Manager
Square / Block · San Francisco, CA- Led a team of four sales data analysts; upskilled them through training and pair programming.
- Owned performance reviews, career conversations, and team-level priorities.
- Led the sales reporting and infrastructure overhaul; rolled out a new forecasting methodology.
- Apr 2019 – Jan 2022
Senior Data Scientist — E-Commerce & Mobile App Platform
Square / Block · San Francisco, CA- Rebuilt the Editor Prime data model and event-tracking infrastructure; built ETLs in Airflow.
- Defined sprint KPIs, built Looker dashboards, ran impact analyses and A/B tests across onboarding, the website editor, and OS deprecation.
- Led the Optimizely rollout for ECOM; co-hosted org-wide A/B testing office hours.
- Oct 2017 – Feb 2019
Data Scientist
Medium · San Francisco, CA- Product analytics: user segmentation, funnel and behavior, and growth time-series analyses.
- Data engineering: designed, built, and optimized ETLs in Redshift.
- Tooling, dashboarding, and reporting for Marketing, Editorial, and Product teams.
- Experimentation: designed and analyzed A/B tests across web and mobile, then translated the results into recommendations.
- Jul 2016 – Oct 2017
Product Analyst
FiveStars · San Francisco, CA - Nov 2015 – Apr 2016
Data Analyst
YouNoodle · San Francisco, CA
Education
MSci, Atomic & Particle Physics and Physical Chemistry (Natural Sciences)
University College London · 2015
National scholarship recipient — sole Polish student selected that year
Headington School, Oxford
Skills
Programming & Analysis
Python · SQL · Presto · regex · bash · git
Platforms & Tools
Snowflake · Airflow · Looker · Tableau · Growthbook · Anomalo · Select Star · Optimizely
AI & LLM Ops
Claude (Snowflake Cortex) · GPT · GooseAI · OpenAI API · Perplexity · MCP
