Data Scientist Intern, AI-Focused, Summer 2026 - St. Louis, MO

About the Team
Our team advances the Decision Intelligence (DI) model, which scores the riskiness of transactions on a scale from 0 to 1000. As Data Scientists, our day-to-day work spans across:
- Feature engineering - extracting meaningful signals that distinguish fraudulent transactions from genuine ones.
- Model development - enhancing machine learning models to effectively learn and adapt to evolving fraud patterns in transaction data.
- Performance monitoring - running rigorous metrics to ensure model stability and effectiveness in production environments.
- Post-production analysis - investigating patterns missed in real time and developing strategies for new feature discovery.
We are constantly innovating to ensure our DI models stay ahead of emerging fraud trends and deliver high-impact insights to protect our customers.

Internship Program
Mastercard's summer internship program provides emerging talent with projects that will enhance skills as well as contribute to the department's goals and objectives. In this program, you will participate in:
- Networking events, mentorship opportunities, and hear from senior leaders
- Volunteer and team building opportunities
- Formal performance assessments
- End-of-summer presentations to peers and Mastercard leadership

Qualifications
- Currently enrolled in a bachelor's degree program majoring in Data Science or a related field with a graduation date of Winter 2026 - Spring 2027
- Hands-on experience, preferably former internship, in AI and Machine Learning
- Experience with opensource models such as Llama and OpenAI
- Has made contributions to opensource
- Had pursued projects in both school and in their personal time in the AI world
- Proficient in Microsoft Office applications
- Excellent communication skills, ability and willingness to tackle complex problems

Mastercard is a merit-based, inclusive, equal opportunity employer that considers applicants without regard to gender, gender identity, sexual orientation, race, ethnicity, disabled or veteran status, or any other characteristic protected by law. We hire the most qualified candidate for the role. In the US or Canada, if you require accommodations or assistance to complete the online application process or during the recruitment process, please contact reasonable_accommodation@mastercard.com and identify the type of accommodation or assistance you are requesting. Do not include any medical or health information in this email. The Reasonable Accommodations team will respond to your email promptly.

Corporate Security Responsibility

All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must:

• Abide by Mastercard's security policies and practices;
• Ensure the confidentiality and integrity of the information being accessed;
• Report any suspected information security violation or breach, and
• Complete all periodic mandatory security trainings in accordance with Mastercard's guidelines.

In line with Mastercard's total compensation philosophy and assuming that the job will be performed in the US, the successful candidate will be offered a competitive base salary and may be eligible for an annual bonus or commissions depending on the role. The base salary offered may vary depending on multiple factors, including but not limited to location, job-related knowledge, skills, and experience. Mastercard benefits for full time (and certain part time) employees generally include: insurance (including medical, prescription drug, dental, vision, disability, life insurance); flexible spending account and health savings account; paid leaves (including 16 weeks of new parent leave and up to 20 days of bereavement leave); 80 hours of Paid Sick and Safe Time, 25 days of vacation time and 5 personal days, pro-rated based on date of hire; 10 annual paid U.S. observed holidays; 401k with a best-in-class company match; deferred compensation for eligible roles; fitness reimbursement or on-site fitness facilities; eligibility for tuition reimbursement; and many more.

Client-provided location(s): O'Fallon, MO

Job ID: Mastercard-22331_R-259720

Employment Type: INTERN

Posted: 2025-09-11T19:20:30