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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # software engineer - **Company:** MASTER CLEAN DRY CLEANERS, INC. - **Location:** United States - **Salary:** $92,000.0 - $147,000.0 - **Contract:** Permanent contract - **Skills:** Testing (Software), Java (Programming Language), Microsoft Windows, Application Programming Interfaces (APIs), Agile Methodology, Architectural Patterns, Automation of Tests, Unit Testing, Configuration Management, Software Quality, Code Review, Cyber Security, Computer Programming, Computer Networks, Continuous Delivery, Continuous Integration, Data Security, Data Structures, Software Debugging, Linux, Programming Tools, Event-Driven Programming, Fault Tolerance, IBM WebSphere MQ, Junit, Unix Shell, Object-Oriented Software Development, Software Architecture, Systems Development Life Cycle, Queueing Systems, Requirements Management, Secure Coding, Server Administration, Shell Script, Software Engineering, Systems Architecture, Scripting, Spring-boot, Git, Event Driven Architecture, Integration Tests, Solid Principles, Kubernetes, Apache Kafka, Bitbucket, Restful APIs, Grpc, Software Version Control, Docker, Microservices - **Published:** October 8, 2026 - **Apply:** https://www.careerbuilder.com/job-details/software-engineer-ii-o-fallon-mo--f3581ecf-813e-4a9b-bb9c-e416c41f1ddd ## About the Role This role offers the opportunity to contribute to highly scalable, mission-critical platforms that power global commerce. We are seeking a software engineer who is passionate about software development, system quality, and continuous improvement, with a strong focus on delivering reliable, maintainable, and secure solutions., * Experience developing microservice and RESTful APIs using event driven architecture with Java, Spring Boot and other relevant event driven/ remote procedure call frameworks such as: gRPC, Apache Kafka, IBM MQ or other related technologies. * Knowledge of software design principles, data structures, and object-oriented programming concepts. * Experience creating and maintaining automated unit tests using frameworks such as JUnit. * Experience working in Windows and Linux-based development environments. * Proficiency working with orchestration platforms and tools, like Kubernetes and Docker. * Familiarity with scripting languages, preferably Shell scripting, to support automation and operational activities. * Experience using source control and collaborative development tools such as Git and Bitbucket. * Understanding of secure coding practices and software quality standards. * Experience working with software development lifecycle practices, including design, coding, testing, debugging, and deployment. * Ability to troubleshoot and resolve moderately complex technical issues independently. * Strong analytical, critical thinking, and problem-solving skills. * Strong verbal and written communication skills with the ability to work effectively in cross-functional teams., Agile Programming Methodologies, Analysis Skills, Apache Kafka, Application Programming Interface (API), Architectural Services, Automation, Code Reviews, Communication Skills, Computer Networks, Computer Security, Continuous Deployment/Delivery, Continuous Improvement, Continuous Integration, Cross-Functional, Data Quality, Data Structures, Debugging Skills, Docker, Functional Testing, Git, IBM WebSphere MQ (Message Queue), Identify Issues, Information Assets, Information/Data Security (InfoSec), Integration Testing, JUnit, Java, Linux Operating System, Microservices, Microsoft Windows Operating System, Object Oriented Programming (OOP), Operational Support, Operations Planning, Performance Management, Presentation/Verbal Skills, Problem Solving Skills, Product Testing, Production Systems, Programming Tools, Quality Engineering, Quality Management, Quality Metrics, REST (Representational State Transfer), RPC (Remote Procedure Call), Requirements Management, Risk, Root Cause Analysis, Scripting (Scripting Languages), Secure Coding, Software Administration, Software Architecture, Software Design, Software Development, Software Development Lifecycle (SDLC), Software Engineering, Software Testing, Source Code/Configuration Management (SCM), Standards Development, System Architecture, Systems Scalability, Team Player, Technical Recruiting, Technical/Engineering Design, Test Automation, Test Plan/Schedule, Testing, Unit Test, Unix Shell Programming, Validation Testing, Writing Skills ## Description We are hiring a Software Engineer II to join Mastercard's Core Payments department, responsible for delivering solutions that facilitate billions of secure transactions between issuers, acquirers, and service providers worldwide., Software Development & Design * Design, develop, test, and maintain high-quality Java-based software components that meet engineering and business requirements. * Apply software design principles to create maintainable, scalable, and efficient solutions for moderately complex business and technical challenges. * Complete detailed technical design activities for assigned features, ensuring alignment with established architectural standards and development practices. * Participate actively in gathering requirements, technical discussions, and solution design sessions. Software Architecture & Operability * Contribute to system architecture discussions and support implementation of architectural patterns that promote scalability, performance, maintainability, and operational reliability. * Develop solutions with operational readiness in mind, including observability, monitoring, troubleshooting, and supportability considerations. * Collaborate with team members to improve system resiliency and production stability. Testing & Quality Engineering * Design, develop, and maintain comprehensive unit, functional, and integration tests to validate application behavior and ensure software quality. * Partner with quality engineers and testers to validate functionality and verify requirements are met. * Support continuous integration and deployment practices through automated testing and quality validation. Performance & Reliability * Analyze application behavior and identify opportunities to improve system performance, scalability, and reliability. * Investigate performance bottlenecks and contribute to tuning and optimization efforts within supported applications. Secure Coding & Code Quality * Apply secure coding practices to develop software that minimizes vulnerabilities and adheres to organizational security standards. * Participate in peer code reviews, providing constructive feedback to improve code quality, maintainability, security, and adherence to engineering standards. * Incorporate feedback from reviews and testing activities to continuously improve delivered solutions. Troubleshooting & Collaboration * Utilize analytical and problem-solving skills to identify, diagnose, and resolve application and system issues. * Support debugging and root-cause analysis activities across development, testing, and production environments. * Collaborate effectively with software engineers, testers, product owners, and other stakeholders in a fast-paced, Agile team environment. * Deliver assigned work within iteration timelines while maintaining a strong commitment to quality and customer outcomes., All 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, and * Complete all periodic mandatory security trainings in accordance with Mastercard's guidelines.