Software Engineer II at Mastercard

Department: Engineering

Compensation

$92,000 – $147,000/yr

Location: O’Fallon, Missouri
Type: Full-time
Level: mid
Posted: Sep 19, 2026

Description

Mastercard is hiring a Software Engineer II for its Core Payments department to design, develop, test, and maintain Java-based software components for scalable, mission-critical payment platforms. The role covers software architecture, observability, automated testing, performance optimization, secure coding, troubleshooting, and collaboration in an Agile environment. Candidates should have experience with microservices, RESTful APIs, event-driven architectures, Java, Spring Boot, Kubernetes, Docker, Git, and Linux or Windows development environments. The position is based in O'Fallon, Missouri, with a base salary of $92,000 to $147,000 USD.

Required Skills

Java
Spring Boot
Microservices
REST APIs
Kubernetes
Docker
Git
JUnit
Apache Kafka

Additional Information

Required Previous Experiences: Experience developing microservice and RESTful APIs using event-driven architecture with Java, Spring Boot, and related frameworks
Experience creating and maintaining automated unit tests using JUnit
Experience working in Windows and Linux-based development environments
Experience using Git and Bitbucket for source control and collaborative development
Experience with the software development lifecycle, including design, coding, testing, debugging, and deployment
Preferred Qualifications: Familiarity with Shell scripting for automation and operational activities