Senior Software Engineer In Test Jobs in O Fallon, MO

Our Purpose
Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we're helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential.
Title and Summary
Senior Software Engineer
Who is Mastercard?
Mastercard is a global technology company in the payments industry. Our mission is to connect and power an inclusive, digital economy that benefits everyone, everywhere by making transactions safe, simple, smart, and accessible. Using secure data and networks, partnerships and passion, our innovations and solutions help individuals, financial institutions, governments, and businesses realize their greatest potential.
Our decency quotient, or DQ, drives our culture and everything we do inside and outside of our company. With connections across more than 210 countries and territories, we are building a sustainable world that unlocks priceless possibilities for all.
About the Role
The Payment & Enablement Optimization program is hiring a Senior Software Engineer to drive our customer experience strategy forward by consistently innovating and problem-solving. The ideal candidate is passionate about the customer experience journey, highly motivated, intellectually curious, analytical, and possesses an entrepreneurial mindset.
Role
As a Senior Software Engineer, you will:
• Design, develop, and maintain scalable solutions aligned with enterprise architecture standards
• Apply software design principles and architectural patterns to create maintainable and extensible testing and validation systems
• Contribute to system architecture discussions, ensuring solutions are testable, observable, secure, and performant
• Translate business and system requirements into well-designed technical solutions, test strategies, and validation models
• Ensure secure coding practices are embedded in development and testing processes, proactively identifying vulnerabilities and risks
• Develop and execute testing strategies across all levels: unit, functional, integration, system, and performance testing
• Leverage data structures and algorithms to optimize test execution, data handling, and performance validation
• Collaborate in Agile environments, contributing to backlog refinement, sprint planning, and design discussions
Responsibilities
Software Engineering & Development
• Design, build, test, deploy, and maintain software components, automation frameworks, and validation tools
• Apply strong knowledge of data structures, algorithms, and efficient coding practices in building scalable solutions
• Contribute to end-to-end software development lifecycle, including design, development, testing, deployment, and monitoring
Architecture & Design
• Participate in defining software architecture and design patterns to ensure scalability, reliability, and maintainability
• Ensure systems are designed for testability, observability, performance, and operational readiness
• Provide input into microservices and cloud migration strategies
Quality Engineering & Testing
• Develop and implement test automation frameworks and CI/CD integration pipelines (e.g., Jenkins, XLR)
• Design comprehensive test strategies and plans, including performance, reliability, and production simulation testing
• Ensure high code quality and coverage using tools such as Sonar or Clover
Security & Compliance
• Apply and promote secure coding practices, including code analysis, vulnerability detection, and mitigation strategies
• Integrate security testing into CI/CD pipelines
Code Quality & Reviews
• Conduct and lead code reviews, ensuring adherence to coding standards, security practices, and maintainability
• Act as a technical reviewer for system designs, test strategies, and implementation approaches
Operability & Performance
• Ensure systems are observable, monitorable, and resilient across environments
• Perform performance engineering, including load testing, tuning, and bottleneck analysis
• Troubleshoot complex production issues and ensure rapid resolution
Collaboration & Leadership
• Partner with developers, architects, and product teams to drive engineering best practices
• Mentor junior engineers and contribute to knowledge sharing across teams
• Evaluate and recommend tools, technologies, and frameworks for continuous improvement
All About You
• Demonstrated experience building applications and REST APIs with Java in the Spring Boot framework for event driven domain architecture and frameworks.
• Experience delivering solutions with open-source distributed event streaming platforms tools such as, Apache KAFKA, RabbitMQ, etc.,
• Ability to write clean, secure, testable code and contribute to unit, service, and integration testing.
• Ability to work on relational data concepts, preferably with PostgreSQL databases.
• Strong foundation in computer science fundamentals, including data structures, algorithms, and object-oriented design
• Strong analytical and problem-solving skills, with the ability to debug issues and identify practical solutions.
• Strong verbal and written communication skills and the ability to work effectively in a collaborative team environment.
• Self-motivated, organized, and eager to learn, with a passion for continuous improvement and delivering results.
• Strong hands-on experience in software engineering, including development and quality engineering
• Proven experience working with:
• Testing across platforms: Linux and web applications
• Automation development and CI/CD integration and deployment (Jenkins / XLR/ GitHub Actions) and code coverage tools (Sonar, Clover) to ensure high code/ conditional coverage
• Unit, functional, and integration testing
• Performance testing and engineering
• Strong knowledge and understanding of:
• Software design principles (OOP, modularity, design patterns)
• Software architecture concepts (microservices, distributed systems, scalability)
• Data structures and algorithms
• Experience with secure coding practices and application security principles (e.g., OWASP)
• Ability to contribute to system design and architecture decisions; understanding use cases for advanced design patterns (e.g., service-to-worker, MVC, API Gateway, Intercepting Filter, Dependency Injection, Lazy Loading, all from the gang of four) to implement efficient code
Preferred Qualifications
• Experience in cloud and microservices architecture or mainframe modernization
• Experience designing systems for reliability, performance, and scalability
• Domain knowledge in payments and transaction processing systems
• Bachelor's or master's degree in computer science or equivalent experience is preferred degree in computer science or equivalent experience is preferred
Mastercard is a merit-based, inclusive, equal opportunity employer that considers applicants without regard to gender, gender identity, sexual orientation, race, ethnicity, disabled or veteran status, or any other characteristic protected by law. We hire the most qualified candidate for the role. In the US or Canada, if you require accommodations or assistance to complete the online application process or during the recruitment process, please contact reasonable_accommodation@mastercard.com and identify the type of accommodation or assistance you are requesting. Do not include any medical or health information in this email. The Reasonable Accommodations team will respond to your email promptly.
Corporate Security Responsibility
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.

In line with Mastercard's total compensation philosophy and assuming that the job will be performed in the US, the successful candidate will be offered a competitive base salary and may be eligible for an annual bonus or commissions depending on the role. The base salary offered may vary depending on multiple factors, including but not limited to location, job-related knowledge, skills, and experience. Mastercard benefits for full time (and certain part time) employees generally include: 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; and many more. Mastercard benefits for interns generally include: 56 hours of Paid Sick and Safe Time; jury duty leave; and on-site fitness facilities in some locations.
Pay Ranges
O'Fallon, Missouri: $115,000 - $184,000 USD