Software Engineer II

Software Engineer IIOverviewThe Software Engineer II is an experienced software engineer specializing in Java development and microservices architecture. This role independently develops scalable, cloud-ready applications while contributing to software design, architecture, operational excellence, and production support.What You Will Do• Design software components by translating product requirements into scalable technical solutions.• Contribute to software architecture decisions and technical design discussions.• Build modular, extensible, maintainable, and performant applications.• Design, execute, and maintain unit, functional, and integration tests.• Apply secure coding practices throughout the software development lifecycle.• Participate in code reviews and contribute to engineering quality standards.• Support system performance optimization, scalability improvements, and reliability initiatives.• Design applications with observability, operational readiness, and supportability in mind.• Research new technologies, frameworks, and engineering practices.• Participate in proof-of-concepts and technical experimentation.• Troubleshoot application and production issues using structured root cause analysis.• Support applications throughout their lifecycle, including production support.• Collaborate with cross-functional stakeholders to deliver business solutions.All About You• Solid understanding of Java, J2EE, Spring, Spring Boot, Kafka, RESTful Web Services, and JPA.• Experience developing cloud-ready applications and microservices.• Understanding of software architecture and design principles.• Experience with automated testing, unit testing, and integration testing.• Familiarity with performance optimization and scalability concepts.• Understanding of secure software development practices.• Experience participating in code reviews.• Strong analytical and troubleshooting skills.• Exposure to CI/CD and Test-Driven Development practices.• Experience or exposure to AI-assisted applications, autonomous agents, or agentic workflows.• Agile Scrum experience.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 ResponsibilityAll 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, andComplete all periodic mandatory security trainings in accordance with Mastercard's guidelines.Pay RangesO'Fallon, Missouri: $92,000 - $147,000 USD