Data Scientist III

Chewy is hiring a Data Scientist III to join the Chewy Marketing Science team in Boston, MA (onsite). In this role, you will help build and deploy AI/ML solutions across the full model lifecycle, turning ideas into measurable marketing and customer impact.

What you’ll be doing

• Own end-to-end data science work, from ideation and offline evaluation through deployment, experimentation, feedback loops, and continuous model improvement.
• Develop and ship predictive, statistical, and machine learning models such as regression, forecasting, uplift, attribution, and causal inference.
• Formalize assumptions about model behavior, detect outliers systematically, and implement improvements when issues are found.
• Collaborate with marketing stakeholders to identify, scope, and prioritize AI and data science opportunities that drive business outcomes.
• Build internal AI copilots and assistants to improve productivity, automate repetitive workflows, and speed up campaign execution.
• Monitor industry and technology trends in AI and e-commerce to identify emerging opportunities.
• Communicate insights and recommendations clearly to technical and non-technical audiences.

Requirements

• Advanced degree (M.S. or Ph.D., or equivalent experience) in a relevant field, or 5+ years designing optimization and machine learning solutions at scale.
• Strong foundation in machine learning and statistical methods, including Bayesian inference, regression, classification, forecasting, time series, causal inference, and tree-based models such as XGBoost and Random Forest.
• Ability to apply advanced math and data science techniques to solve complex business problems.
• Proficiency in Python to build proofs-of-concept and production-ready solutions.
• Experience translating business needs into AI and data science opportunities, with knowledge of marketing workflows, customer data, and campaign lifecycles.
• Track record of prototyping quickly, iterating through experimentation, and operationalizing models into production.
• Business acumen and problem-solving skills in ambiguous, fast-paced environments.
• Excellent communication skills for stakeholders across technical levels.
• AI-native mindset with curiosity and enthusiasm for leveraging the latest AI tools.

Bonus (if applicable)

• Marketing measurement and optimization experience, including budget allocation, marketing mix modeling, incrementality testing, and campaign performance optimization.
• Bayesian statistics and hierarchical modeling expertise.
• Experience with at least one cloud provider (AWS, GCP, or Azure).
• Experience with ML platforms such as Databricks.

Tools you may use

Python, AWS, GCP, Azure, Databricks, XGBoost, Random Forest

Benefits

• 401k plus a new hire and annual equity grant
• C08+ positions may also be eligible for an annual bonus
• Medical/Rx, vision, dental, life, disability, hospital indemnity, critical illness, and accident coverage
• Parental leave, family services benefits, backup dependent care
• Flexible spending accounts
• Telemedicine
• Pet adoption reimbursement and 10% off pet insurance
• 20% off at Chewy.com
• Employee assistance program
• Exempt salary team members have unlimited PTO, subject to manager approval
• Six paid holidays per year
• Paid sick and family leave in compliance with applicable state and local regulations