Arjun Mehta
Data Scientist, Machine Learning and Experimentation
Seattle, WA, USA · arjun.mehta@example.com · +1 555 0153 · linkedin.com/in/arjunmehta-example · github.com/arjunmehta-example
Summary
Data scientist with 7 years of experience building recommendation, forecasting and churn models for subscription and marketplace businesses. Deep in Python, SQL, PyTorch and causal inference, with models running in production on AWS SageMaker. Led a recommendation overhaul that lifted engagement by 11% and designed the experimentation framework behind 200+ A/B tests a year.
Experience
Senior Data Scientist · Evergreen Streaming
Seattle, WA · May 2022 – Present
- Rebuilt the home-page recommender as a two-tower neural retrieval model in PyTorch, raising watch time per session by 11% across 4M monthly users in an online A/B test.
- Designed a CUPED-based experimentation framework that cut required test duration by about 30% and is now used for 200+ experiments a year.
- Built a gradient-boosted churn model (XGBoost, SHAP) that flags at-risk subscribers 30 days ahead; targeted offers reduced voluntary churn by 6%.
- Deployed models through SageMaker pipelines with drift monitoring, cutting the time from notebook to production from six weeks to ten days.
- Mentored three data scientists and led a monthly reading group on causal inference methods.
Data Scientist · Riverside Marketplace
Portland, OR · Aug 2019 – Apr 2022
- Developed a weekly demand-forecasting model (LightGBM and Prophet) for 1,200 product categories, lowering forecast error (WAPE) from 28% to 17%.
- Built a dynamic pricing test for delivery fees that increased contribution margin by $1.8M a year with no measurable drop in order volume.
- Created a fraud-detection classifier that caught 35% more fraudulent sign-ups at the same false-positive rate, saving about $400K a year.
- Wrote production-grade feature pipelines in SQL and Airflow and documented them for analytics and engineering teams.
Data Science Intern · Cascade Health Analytics
Seattle, WA · Jun 2018 – Sep 2018
- Built a logistic-regression model predicting 30-day hospital readmissions with an AUC of 0.74 on held-out data.
- Cleaned and linked 1.1M de-identified patient records under HIPAA-compliant data access rules.
- Presented findings and model limitations to clinical stakeholders in a written report and briefing.
Projects
- Open-source contribution: Merged pull requests improving documentation and tests for a popular Python forecasting library.
Education
M.S. Data Science, University of Washington, Seattle, WA · 2019
B.Tech. Computer Science and Engineering, Vellore Institute of Technology, Vellore, India · 2017
Skills
Python (pandas, scikit-learn, PyTorch) · SQL · Machine learning (supervised and unsupervised) · Recommender systems · Time-series forecasting · A/B testing and causal inference · Statistics and probability · XGBoost and LightGBM · Feature engineering · MLOps (SageMaker, MLflow) · Apache Spark · Airflow · AWS · Data visualization (Matplotlib, Tableau) · Communicating results to non-technical audiences
Certifications
- AWS Certified Machine Learning – Specialty
Languages
English (Fluent) · Hindi (Native) · Gujarati (Native)