AI-Focused Data Scientist Intern - St. Louis (Jun 2026)

Join Mastercard as a Data Scientist Intern focused on AI, contributing to fraud detection and model innovation in a global payments leader.

Your Role

Key responsibilities include:

• Feature engineering to extract signals distinguishing fraudulent from genuine transactions.
• Developing and enhancing machine learning models to adapt to evolving fraud patterns.
• Monitoring model performance to ensure stability and effectiveness in production.
• Conducting post-production analysis to identify missed patterns and develop new features.
• Collaborating with the Decision Intelligence team to advance transaction risk scoring models.

About You

The company is looking for:

• Currently enrolled in a bachelor’s degree program in Data Science or related field, graduating Winter 2026 – Spring 2027.
• Hands-on experience in AI and Machine Learning, preferably through internships.
• Experience with open-source models such as Llama and OpenAI.
• Contributions to open-source projects.
• Engagement in AI projects both academically and personally.
• Proficiency in Microsoft Office applications.
• Excellent communication skills and willingness to tackle complex problems.
• Eligibility to work in the United States without employer sponsorship.

Compensation & Benefits

• Competitive base salary with potential annual bonus or commissions.
• Insurance including medical, prescription drug, dental, vision, disability, and life insurance.
• Flexible spending account and health savings account.
• Paid leaves including 16 weeks new parent leave, up to 20 days bereavement leave, 80 hours Paid Sick and Safe Time, 25 days vacation, and 5 personal days (pro-rated).
• 10 annual paid U.S. observed holidays.
• 401k with best-in-class company match.
• Deferred compensation for eligible roles.
• Fitness reimbursement or on-site fitness facilities.
• Eligibility for tuition reimbursement.

Training & Development

• Participation in networking events and mentorship opportunities.
• Engagement with senior leaders through presentations and discussions.
• Volunteer and team-building activities.
• Formal performance assessments.
• End-of-summer presentations to peers and Mastercard leadership.

Corporate Security Responsibility

• Adhere to Mastercard’s security policies and practices.
• Ensure confidentiality and integrity of accessed information.
• Report any suspected information security violations or breaches.
• Complete all mandatory security trainings as required.

How to Apply

Submit your application ensuring you meet the eligibility criteria for work authorization in the United States. 

This job may close before the stated closing date, you are encouraged to apply as soon as possible

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