Internship Java Developer Jobs in Saint Louis, MO

Our Purpose

Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we're helping build asustainableeconomy where everyone can prosper. We support a wide range of digital payments choices, making transactionssecure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential.

Title and Summary

Software Engineer Intern, Summer 2027 - United StatesWhy should I choose Mastercard's internship program?
Mastercard's internship program offers more than hands-on work. It provides an opportunity to build skills, expand your network, and make a meaningful impact while working on projects that support business priorities. It provides an opportunity to build skills, expand your network, and make a meaningful impact while working on projects that support business priorities.
About the team
Mastercard's Software Engineering teams design, build, and optimize high-performing, highly scalable software solutions and products for some of the world's top brands. Using advanced cloud platforms, AI frameworks, and secure blockchain technologies, your work will transcend borders, connecting communities and transforming commerce.
What you'll do
As a Software Engineering Intern, you'll build foundational engineering skills, contribute to real-world projects, and gain experience working on technology used at a global scale. You'll collaborate with experienced engineers, contribute to meaningful projects, and gain hands on experience building scalable, secure, and reliable technology. You may:
Be a part of a real engineering team contributing to live systems and products.
Contribute to building scalable, high-performance systems used globally
Write clean, efficient, and maintainable code using modern programming languages
Support design, development, and testing of software features
Write basic automated tests to verify code behavior
Learn and apply secure coding practices
Participate in code reviews, team discussions, and agile ceremonies
Collaborate with product managers, designers, and engineers to deliver solutions
Troubleshoot issues, debug code, and support enhancements
Gain exposure to how enterprise software systems are built and maintained
Note: responsibilities, projects, tools, technologies and programming languages will vary by team
What we're looking for
Currently pursuing a Bachelor's degree in Computer Science, Engineering, or a related field graduating December 2027 and beyond
Basic understanding of programming languages such as Java, Python, C++, JavaScript, or similar
Strong foundation in data structures, algorithms, and core computer science concepts
Familiarity with version control (e.g., Git)
Interest in software testing, debugging, and problem solving
Curiosity, motivation, and a willingness to learn
Please be sure to upload an unofficial copy of your school transcript when submitting your application.
This role is not eligible for Mastercard's work authorization sponsorship. As such, candidates must be eligible to work in the United States, now as well as in the future, without employer sponsorship. For example, students or recent graduates in the United States on an F1 visa (including those with CPT or OPT authorization) are not eligible for this role.
As an intern, you'll benefit from
Mentorship and coaching from experienced professionals and leaders
Networking opportunities with fellow interns, employees, and senior leaders
Professional development experiences focused on career growth and skill-building
Exposure to innovative technologies and global business challenges
Volunteer, community engagement, and team-building activities
Many of our interns continue building their careers with Mastercard through full-time opportunities, early career programs, or future internships.
Pay Range
Arlington, Virginia; New York City, New York: $35-$46/hr USD
Atlanta, Georgia; O'Fallon, Missouri: $27-$34/hr USDMastercard 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. Mastercard benefits for interns generally include: 56 hours of Paid Sick and Safe Time; jury duty leave; and on-site fitness facilities in some locations.