Software Engineer II - Decision Management Program

Join Mastercard in O'Fallon, Missouri, where the Notification Manager team within the Decision Management Program drives how high-volume notifications are delivered to customers and partners. As a Software Engineer II, you will design, implement, and support Java and Spring Boot microservices that form secure, scalable back-end systems, while contributing to the ongoing modernization of the platform.

Responsibilities

• Design, develop, test, and maintain Java Spring Boot microservices that power high-volume notifications.
• Architect software components and service interactions to meet scalability, maintainability, and reliability goals.
• Implement enhancements, new features, and defect fixes across Notification Manager services.
• Participate in technical design discussions and translate requirements into working software.
• Write clean, secure, and maintainable code in line with Mastercard engineering standards.
• Develop and maintain automated unit, integration, and API tests.
• Contribute to modern event-driven architectures using Kafka and distributed processing patterns.
• Support platform modernization through service decomposition, resiliency improvements, and cloud-native deployment practices.
• Help reduce technical debt and boost operational efficiency across the platform.
• Engage in production support, incident response, and root cause analysis.
• Monitor system health with observability tools and metrics; analyze performance to optimize throughput, latency, and resource usage.
• Troubleshoot application, infrastructure, and data-related issues; support release activities and production readiness.
• Contribute to operability engineering practices that improve system reliability and supportability.
• Collaborate with engineers, QA, PMTs, TPMs, and partner teams to deliver roadmap commitments.
• Participate in Agile ceremonies, elaboration sessions, estimation, and backlog refinement; engage in peer code reviews.
• Contribute to technical documentation and knowledge sharing; mentor junior engineers when appropriate.

Requirements

• Bachelor’s degree in Computer Science, Engineering, or equivalent experience.
• 2–5 years of software development experience.
• Experience with Java and Spring Boot.
• Understanding of REST APIs and microservice architectures.
• Familiarity with messaging or event-driven systems.
• Strong grasp of software design principles, object-oriented programming, data structures, and algorithms.
• Experience with source control, code reviews, and CI/CD practices.
• Working knowledge of SQL and relational databases.
• Strong troubleshooting and problem-solving skills; ability to work independently while collaborating within a team.

Technologies

• Java (JDK 17)
• Spring Boot
• Kafka Messaging
• REST APIs
• Oracle / SQL
• GitHub / Bitbucket
• CI/CD Pipelines
• Splunk & Dynatrace
• PCF / Tanzu
• Distributed Event-Driven Architecture

Benefits

• Health insurance (medical, prescription drug, dental, vision, disability, life)
• Flexible spending account (FSA) and health savings account (HSA)
• Paid leaves including 16 weeks of new parent leave and up to 20 days of bereavement leave
• Paid Sick and Safe Time (80 hours)
• Vacation and personal days (25 days of vacation and 5 personal days, pro-rated)
• 10 annual paid U.S. observed holidays
• 401(k) with company match
• Deferred compensation for eligible roles
• Fitness reimbursement or on-site facilities
• Tuition reimbursement

Corporate Security Responsibility

• Adhere to Mastercard's security policies and practices
• Protect confidentiality and integrity of information accessed
• Report suspected information security violations or breaches
• Complete periodic mandatory security trainings in line with Mastercard guidelines

Pay Range

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

How you'll make an impact

This role suits a backend engineer who enjoys solving complex problems and gaining insights into large-scale distributed systems. You bring curiosity, collaboration, and a proactive mindset, taking ownership of your work while seeking opportunities to improve the platform, codebase, and engineering practices. You apply solid software design principles, contribute to architectural discussions, and take pride in delivering high-quality, secure back-end solutions.

Success measures (first 12 months)

Independently deliver stories and enhancements from design through production deployment; contribute meaningful improvements to platform reliability, performance, or maintainability. Demonstrate ownership of one or more Notification Manager services or technical domains; participate effectively in production support and incident investigations. Build strong partnerships with Product, TPM, QA, and peer engineering teams; continuously improve technical knowledge and contribute to team engineering practices.