Software Engineer II

Mastercard’s Digital Enablement Services (MDES) Quality Engineering team is hiring a Software Engineer II to build and run end-to-end quality engineering solutions across the software development lifecycle.

Responsibilities

• Design, develop, test, and maintain scalable software applications, services, and APIs
• Contribute to software architecture and technical design decisions focused on scalability, performance, reliability, and maintainability
• Build and enhance microservices and distributed systems supporting Mastercard’s technology ecosystem
• Write high-quality, reusable, and maintainable code aligned with engineering best practices and coding standards
• Participate in requirements reviews, solution design discussions, sprint planning, and technical refinement
• Perform code reviews and provide constructive feedback to improve software quality and maintainability
• Apply secure coding practices and software engineering standards throughout development
• Develop and maintain automated tests to improve application quality and reliability
• Support CI/CD pipelines and engineering automation to accelerate delivery
• Analyze application logs, troubleshoot issues, conduct root-cause analysis, and implement sustainable fixes
• Optimize application performance, scalability, resiliency, and operational readiness
• Collaborate with Product, Engineering, Platform, and Quality teams to deliver customer-focused solutions
• Support engineering best practices, technical standards, and continuous improvement initiatives
• Mentor junior engineers and help build a culture of collaboration, innovation, and technical excellence
• Use AI-assisted engineering tools and solutions to improve productivity and software quality

Requirements

• Bachelor’s degree in Computer Science, Engineering, or a related field
• 3+ years of software engineering experience developing enterprise applications and services
• Strong programming skills in Java and object-oriented design principles
• Strong knowledge of Java and Spring
• Experience with JUnit and Eclipse IDE
• Experience with Rest Assured and JBehave/Cucumber frameworks
• Working knowledge of databases such as Oracle
• Experience with APIs including REST / SOAP
• Knowledge of Continuous Delivery concepts and tools such as Jenkins / Bamboo
• Experience with vulnerability tools such as Sonar and Checkmarx/Fortify
• Experience with XP, TDD, and BDD processes and architecture patterns
• Experience designing, developing, testing, and maintaining software applications
• Knowledge of software design patterns, architecture principles, and distributed system concepts
• Understanding of data structures, algorithms, and performance optimization techniques
• Experience building and consuming RESTful APIs and microservices
• Hands-on experience with Maven, Git, Jenkins, and modern software development tools
• Experience with SQL and data management concepts
• Understanding of CI/CD practices and Agile software development methodologies
• Knowledge of secure coding practices and software security fundamentals
• Strong troubleshooting, debugging, problem-solving, and analytical skills
• Excellent verbal and written communication skills

Technologies

• Java
• Spring
• JUnit
• Eclipse IDE
• Rest Assured
• JBehave
• Cucumber
• Oracle
• REST
• SOAP
• Jenkins
• Bamboo
• Sonar
• Checkmarx
• Fortify
• XP
• TDD
• BDD
• Maven
• Git
• SQL
• CI/CD
• Agile
• microservices
• RESTful APIs

Preferred Qualifications

• Experience with Mastercard MDES, tokenization, or digital payment platforms
• Experience developing cloud-native applications and working within containerized environments
• Ability to perform PoCs (Proof of Concept) and support technology selection
• Experience building highly available, resilient, and scalable distributed systems
• Knowledge of performance engineering, observability, monitoring, and operational excellence practices
• Experience supporting production services in enterprise-scale environments
• Familiarity with automated testing frameworks and testing best practices
• Experience integrating quality and automation capabilities into CI/CD pipelines
• Exposure to AI-powered software engineering and developer productivity tools

Benefits

• Insurance (including medical, prescription drug, dental, vision, disability, life insurance)
• Flexible spending account and health savings account
• Paid leaves (including 16 weeks of new parent leave and up to 20 days of bereavement leave)
• 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
• 56 hours of Paid Sick and Safe Time (interns)
• Jury duty leave (interns)
• On-site fitness facilities in some locations (interns)

Corporate Security Responsibility

• 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

Location and Pay Range

• Location: O'Fallon, MO (onsite)
• Pay range: USD 92,000 - 147,000 per year