Software Engineer Intern, Summer 2027 – United States
O'Fallon, MO
Internship
Onsite
$35/hr - $46/hr
Intern
Mastercard is a global payments and technology company that supports secure, accessible digital transactions worldwide. The Software Engineer Intern will build foundational engineering skills, contribute to scalable and secure software systems, write and test code, troubleshoot issues, and collaborate with 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
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
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
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
56 hours of Paid Sick and Safe Time
Jury duty leave
On-site fitness facilities in some locations
May be eligible for an annual bonus or commissions depending on the role
Mastercard is a financial network that processes payments between banks and cardholders.
