Software Engineer I

Software Development Engineer

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.

Overview

The Software Development Engineer 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.

What You Will Do

• 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.

All About You

• 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. In the US or Canada, if you require accommodations or assistance to complete the online application process or during the recruitment process, please contact View email address on click.appcast.io 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.

Pay Ranges

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