Software Development Engineer

Our Purpose Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we’re helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, 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.

Software Engineer I

The Software Engineer I is an early‑career software engineer specializing in Java development with a focus on building microservices that support Mastercard's high‑throughput, low‑latency transaction processing platforms. This role provides opportunities to learn modern software engineering practices while contributing to the development, testing, deployment, and support of business‑critical applications.

• Develop software solutions by translating product requirements into technical implementations with guidance from senior engineers.
• Contribute to software design discussions and propose scalable, maintainable solutions.
• Write modular, readable, and performant code following engineering best practices.
• Develop and maintain unit tests and automated test coverage to validate software quality and reliability.
• Participate in functional and integration testing activities across applications and services.
• Follow secure coding standards and software engineering best practices throughout the development lifecycle.
• Participate in peer code reviews and incorporate feedback to improve code quality and maintainability.
• Assist with prototyping and proof‑of‑concept initiatives.
• Support cloud‑ready microservices and distributed applications.
• Assist in troubleshooting and resolving software defects and production issues.
• Build applications with maintainability, reliability, and operational readiness in mind.
• Collaborate closely with cross‑functional teams using Agile Scrum methodologies.

• Good understanding of Java, J2EE, Spring, Spring Boot, Kafka, RESTful Web Services, and JPA.
• Foundational understanding of software design and architecture concepts.
• Familiarity with unit, functional, and integration testing practices.
• Understanding of secure coding principles.
• Strong problem‑solving and analytical skills.
• Strong understanding of data structures and their impact on application performance.
• Exposure to microservices and cloud‑native application development.
• Knowledge or experience with AI‑assisted applications, AI agents, or agentic workflows is a plus.
• Exposure to CI/CD practices and Test‑Driven Development.
• Strong communication skills and willingness to learn from experienced engineers.

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.

Corporate 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.

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.

O'Fallon, Missouri: $72,000 - $115,000 USD