Software Development Engineer II

Mastercard•O'fallon, MO

5d•$92,000 - $147,000•Onsite

About The Position

The Software Development 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.

Requirements

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.
Agile Scrum experience.

Nice To Haves

Exposure to CI/CD and Test-Driven Development practices.
Experience or exposure to AI-assisted applications, autonomous agents, or agentic workflows.

Responsibilities

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.

Benefits

insurance (including medical, prescription drug, dental, vision, disability, life insurance)
flexible spending account and health savings account
16 weeks of new parent leave
up to 20 days of bereavement leave
80 hours of Paid Sick and Safe Time
25 days of vacation time
5 personal days
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