Senior Data Scientist

Position: Senior Data Scientist 

Job Location: 811 Excellence Dr, Bentonville, AR 72716 

Duties: Apply knowledge of feature relevance and selection, exploratory data analysis techniques, advanced statistical methods, and modeling approaches such as graphical models, Bayesian inference, basic natural language processing, computer vision, neural networks, support vector machines, and random forests. Utilize multivariate calculus, statistical foundations of machine learning models, advanced Excel techniques, and programming languages such as R and Python, along with classical and numerical optimization methods including Newton-Raphson, gradient descent, linear programming, integer programming, and quadratic programming. Select appropriate analytical modeling techniques for structured and complex datasets and develop customized analytical models. Conduct exploratory data analysis, including statistical analysis, hypothesis testing, and statistical inference, on available data. Define and refine features based on model performance, introducing new or revised features to improve analytical outcomes. Design experiments by identifying key dimensions, finalizing experimental design, testing hypotheses, and executing analyses. Perform trend and cluster analyses to address business problems and deliver actionable insights and recommendations. Apply knowledge of model fit testing, tuning, and validation techniques, including chi-square tests, ROC curves, root mean square error, and other relevant metrics. Identify appropriate evaluation metrics based on model objectives and business requirements. Assess the impact of variables and features on model performance and apply best-practice testing and tuning techniques to evaluate accuracy, fit, validity, and robustness across multi-stage models and model ensembles. Leverage understanding of model performance drivers, server environments, and model storage formats to support production deployment. Contribute to efforts ensuring analytical models and techniques are production-ready and operationally sustainable. Support model evaluation processes and enable scalability and long-term maintenance of analytical solutions. Utilize programming languages such as SQL, Java, C++, and Python, along with knowledge of business and domain requirements, to develop required solutions and application features. Apply appropriate testing methodologies, including static testing, dynamic testing, software composition analysis, and manual penetration testing, to ensure code quality, functionality, and security. 

Minimum education and experience required: Master’s degree or the equivalent in Computer Science, Statistics, Engineering (any), or related field plus 1 year of experience in analytics or a related field; OR Bachelor's degree or the equivalent in Computer Science, Statistics, Engineering (any), or related field plus 3 years of experience in analytics or a related field. 

Skills required: Must have experience with: coding in object-oriented programming languages (Python); applying statistical techniques such as probability, hypothesis testing and regression analysis; applying machine learning techniques (supervised, unsupervised and semi-supervised models) such as linear and logistic regression, decision trees, support vector machines and deep learning models using PyTorch, TensorFlow and Keras; building optimization models; solving optimization models using Integer programming or linear programming; creating clear and informative visualizations of data to convey insights using Seaborn and MATLAB plot; writing SQL queries; working with large datasets with languages such as PySpark; running experiments scientifically; and analyzing experiments results. Employer will accept any amount of graduate coursework, graduate research experience or professional experience with the required skills. 

Rate of pay: $90,000.00 - 180,000.00/year  

Wal-Mart is an Equal Opportunity Employer.