Software Development Engineer II

Title and Summary

Software Engineer II

The 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.

• 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.

• 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.

• 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.

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 reasonable 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.

O'Fallon, Missouri: $92,000 - $147,000 USD

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. Mastercard benefits for full‑time employees generally include: insurance (including medical, prescription drug, dental, vision, disability, life insurance); flexible spending account and health savings account;

paid leaves; 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. Mastercard benefits for interns generally include: 56 hours of Paid Sick and Safe Time;

jury duty leave; and on‑site fitness facilities in some locations.