Noah Williams
Senior Data Scientist
Seattle, WA · noah@email.com · linkedin.com/in/noahwilliams · github.com/noahwilliams
Professional summary
Senior data scientist with 6 years of experience applying experimentation, predictive modelling, and forecasting to subscription and marketplace products. Strong in Python, SQL, causal inference, model evaluation, and communicating uncertainty to product leaders.
Experience
Senior Data Scientist
Cedar Peak Learning · Seattle, WA
- Designed a stratified onboarding experiment for 180,000 learners, identifying a sequence change that increased week-four course completion by 6.8%.
- Developed and calibrated a churn-risk model with product and lifecycle teams, improving top-decile recall from 41% to 59% before controlled outreach testing.
- Established model cards and quarterly drift reviews for seven production models, giving risk and product teams a shared record of limits, owners, and retraining decisions.
Data Scientist
MarketLane · Portland, OR
- Built a hierarchical demand forecast for 3,200 seller categories, reducing weighted absolute percentage error by 11% against the existing seasonal baseline.
- Partnered with data engineering to move a weekly feature pipeline from notebooks to scheduled dbt and Python jobs, cutting preparation time from nine hours to 70 minutes.
- Analysed buyer-search reformulation patterns and presented three ranking opportunities, one of which improved successful search sessions by 4.2% in an online test.
Skills
Python · SQL · Machine learning · Experiment design · Causal inference · Forecasting · Model evaluation · Feature engineering · scikit-learn · XGBoost · dbt · Data visualisation
Education & credentials
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