Staff Data Scientist

Summary

Join Kard, a company transforming customer loyalty with its rewards-as-a-service API platform, as a Staff Data Scientist. Lead the development of advanced personalization, optimization, and measurement systems. Apply expertise in statistical modeling, experimentation, and machine learning to enhance loyalty campaign performance and user experience. This impactful role involves experimentation frameworks, causal inference, and applied ML, contributing to platform capabilities and strategic decisions. Collaborate with cross-functional teams, mentor other data professionals, and drive high-impact projects. Advance Kard’s measurement and experimentation infrastructure for robust insights. Kard offers a remote-first work environment and a competitive benefits package.

Requirements

• Experience working in data science, focused on experimentation, personalization, or performance measurement
• Significant experience with statistical hypothesis testing and causal inference on large datasets—ideally in digital ads or similar performance-driven domains (fintech, healthcare, economics, finance, B2B SaaS)
• Expertise in both frequentist and Bayesian methods, with strong theoretical foundation and ability to prototype real-world solutions
• Proficiency in machine learning techniques (scikit-learn, XGBoost, PyTorch, etc.) for both inference and model development
• Strong SQL and Python skills, with experience working at scale on complex datasets
• Proven track record of translating statistical and ML insights into business or product impact
• Excellent communication skills and ability to simplify complex topics for diverse audiences
• Experience mentoring and guiding data science peers
• Bachelor’s or Master’s in a quantitative field (Statistics, Computer Science, Mathematics, Economics); Ph.D. a plus but not required
• Inclusive, collaborative, humble, and impact-oriented mindset
• U.S. core business hours availability and willingness to travel for company meetings

Responsibilities

• Design and lead advanced personalization and optimization models to improve campaign targeting, offer performance, and user outcomes
• Build and scale experimentation frameworks for A/B tests, lift studies, and causal inference pipelines
• Develop attribution and measurement methodologies to help partners understand program impact
• Translate statistical and modeling results into actionable, business-relevant insights for Product, Engineering, Sales, and partners
• Collaborate with ML Engineers to operationalize models in production environments
• Mentor other data professionals and provide thought leadership on statistical best practices and model design
• Drive complex, high-impact projects from ideation to delivery, influencing product and platform strategy
• Advance Kard’s measurement and experimentation infrastructure to deliver robust, reproducible insights

Preferred Qualifications

Experience collaborating with product and engineering teams to build data-driven features; production experience is a plus

Benefits

• Flexible PTO, with a minimum requirement to take one day off a quarter, ten days a year, promoting mental well-being
• Observance of 11 Federal Holidays, plus an additional day each for Black Friday and Christmas Eve (US employees only)
• Health, Dental and Vision Insurance
• 401k with employer match (US employees only)
• Coworking space and WFH setup reimbursement
• Company Offsites two times per year for planning, team-building, and networking