Amara Osei
Data Scientist
New York, NY
Professional Summary
Data scientist with 6 years in ML for risk and recommendations. Shipped models lifting fraud catch 27% and a recommender adding 11% revenue per session.
Work Experience
Data Scientist — Payguard
2021 – Present | New York, NY
- Shipped a gradient-boosted fraud model lifting detection 27% at equal false-positive cost.
- Reduced model inference cost 46% by distilling 3 production models.
- Built the feature store powering 4 ML products from a single pipeline.
Machine Learning Engineer — Shopstream
2019 – 2021 | Remote
- Deployed a product recommender lifting revenue per session 11% for 2M users.
- Automated retraining pipelines, cutting model refresh time from 9 days to 6 hours.
Education
MS Data Science Columbia University 2017 – 2019
Skills
Python · PyTorch · scikit-learn · SQL · Airflow · Feature engineering · Causal inference · MLflow