Senior Data Scientist
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Job Description
Cientista de Dados Sr. desenvolvendo modelos preditivos e análises estatísticas para crédito, cobrança, vendas e operações da Go.k Digital. Construção de pipelines e documentação auditável.
Responsibilities:
- Translate business needs into analytical problems by defining the target, observation and performance windows, eligible population, baseline, and success criteria before development.
- Develop classification and regression models for credit risk, propensity, churn, collections, and pricing.
- Perform exploratory analysis and feature engineering based on the business context and data availability at the time of decision-making.
- Validate models by considering out-of-time performance, stability, calibration, and results by segment.
- Apply statistical inference and experimental design when the objective is to assess causal relationships.
- Evaluate results by considering the costs of errors and the expected impact on business decisions.
- Document assumptions, methodology, results, and limitations in an auditable format.
- Present conclusions and recommendations to technical and executive audiences.
- Build and enhance data pipelines in the client environment, ensuring the reliability, organization, and availability of information for regulatory and tax-related teams.
- Work in partnership with credit, collections, sales, operations, and channel teams.
Requirements:
- Degree in Statistics, Mathematics, Computer Science, Engineering, Economics, or a related quantitative field.
- Hands-on experience developing and validating predictive models.
- Proficiency in Python for analysis and modeling, including pandas, scikit-learn, statsmodels, and gradient boosting libraries.
- Advanced analytical SQL.
- Experience with Spark and cloud-based analytics platforms.
- Strong knowledge of statistical inference, causality, experimental design, and selection bias.
- Knowledge of class imbalance, the bias–variance trade-off, and asymmetric error costs.
- Experience with Git version control and peer code review.
- Willingness to work under an independent-contractor (PJ) arrangement.
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