Full-time Posted June 01, 2026
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Job Description

Become a Principal Data Scientist with Mastercard's R&D team in Toronto, Canada, focused on innovative product development. Leverage your expertise in machine learning and data analysis to drive impactful solutions.
As a Principal Data Scientist, you will lead critical data science initiatives and guide teams on best practices in statistical hypothesis testing and data organization. You will collaborate closely with AI/ML engineers to scale and deploy models while mentoring team members in innovative techniques and methodologies.
Key Responsibilities:
• Lead high-priority data science and machine learning projects
• Optimize models through validation and performance tuning
• Collaborate with cross-functional teams for model deployment
• Mentor team members on best practices and techniques
• Innovate architectural designs for production systems
Requirements:
• Proficient in Python and data science libraries like numpy and pandas
• Experience with SQL, JSON,...

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