Software Engineer Intern, Summer 2027 – United States
O'Fallon, MO
Internship
Onsite
$35/hr - $46/hr
Intern
Mastercard powers economies and empowers people through secure, simple, smart, and accessible digital payment solutions worldwide. The Software Engineer Intern will contribute to real-world projects, build scalable and secure software, write and test code, troubleshoot issues, and collaborate with experienced engineers and cross-functional teams.
Responsibilities
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
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
Complete all periodic mandatory security trainings in accordance with Mastercard’s guidelines
Qualification
Required
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
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
Preferred
Benefits
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.
Mastercard benefits for interns generally include: 56 hours of Paid Sick and Safe Time
Jury duty leave for interns
On-site fitness facilities in some locations
Mastercard is a financial network that processes payments between banks and cardholders.
