Software Engineer II

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
Software Engineer II
Who is Mastercard
Mastercard is a global technology company in the payments industry. We work to connect and power an inclusive, digital economy that benefits everyone, everywhere by making transactions safe, simple, smart and accessible.
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.
About the Role
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.
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.
Role
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 About You
• 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.
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 [email protected] 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: $92,000 - $147,000 USD