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MasterCard Software Engineer II in O'Fallon, Missouri

Our Purpose

We work 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. We cultivate a culture of inclusion ( for all employees that respects their individual strengths, views, and experiences. We believe that our differences enable us to be a better team – one that makes better decisions, drives innovation and delivers better business results.

Job Title

Software Engineer II


The Single Message - Online is part of the Transaction Switching organization at Mastercard. The group's mission is to provide the best authorization system for debit and credit card transactions. Engineers working on this program are experts in software development. They use their skills to design and develop software solutions for changing business needs while adhering to Mastercard’s standards, processes, and best practices.


All staff at Mastercard are expected to demonstrate 'Mastercard Way' cultural values every day -own it, simplify it, sense of urgency, thoughtful risk-taking, unlock potential, and be inclusive –with a relentless focus on our customers. As a Software Engineer II at Mastercard, you are expected to perform the following general duties:

• Follow given directions and procedures in software delivery tasks (code development, test, deployment)

• Deliver assigned work seeking guidance from experienced team members

• Proactively seek code reviews of their work from experienced members

• Understands the big picture and end-to-end logical architecture of systems in ownership areas

• Provide feedback and suggestions on areas to improve

• Understands the use of Mastercard technology policies in everyday work

• Demonstrate active learning and sharing of software practices via Guild/Engineering community initiatives

• Participate in reviews of other teammates coding to keep up Mastercard’s coding standards.

All About You:

• Has ability to write secure code in three or more languages (e.g., Java, JavaScript, C, C++, SQL) and is familiar with secure coding standards (e.g., OWASP, CWE, SEI CERT)

• Understands and implements standard branching (e.g., Gitflow) and peer review practices

• Apply tools (e.g., Sonar, Zally, Checkmarx ) and techniques to scan and measure code quality and anti-patterns as part of development activity

• Understands and builds test code at unit level, service level, and integration level to ensure code and functional coverage

• Understands the use of basic design patterns (e.g., factory, adaptor, singleton, composite, observer, strategy, inversion of control)

• Understands requirement analysis being essential part of delivering value to our customers and partners and participate in elaboration, prioritization, and effort estimation

• Understands different SDLC practices (SAFe/Scrum/Kanban/Waterfall) and the delivery situations they are used for

• Understands the basic engineering principles used in building and running mission critical software capabilities (security, customer experience, testing, operability, simplification, service-oriented architecture)

• Familiar with different application patterns to implement different types of business processes (e.g., APIs, event-driven-services, batch-services, web-applications, big data)

• Understands Continuous Integration (CI) and Delivery (CD) concepts, and capabilities to support automation, pipelines, virtualization, and containerization

• Has ability to write code (in languages such as Java, Python, Ruby, Bash, Perl, Groovy) to build automation tasks that are repeatable and efficient

• Understands functional and non-functional testing types to elaborate and estimate test efforts

• Strong communication skills – both verbal and written – with strong relationship,

collaborative and organizational skills.

COVID-19 Considerations

We value the safety of each member of our community because we know we’re all in this together. In many locations, which may change over time, we’ve implemented a virtual hiring process and continue to interview candidates by video or phone. In addition, in some locations, only individuals who have been fully vaccinated will be permitted inside Mastercard offices until further notice.

About Mastercard

Mastercard is an inclusive Equal Employment 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.

If you require accommodations or assistance to complete the online application process, please contact 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.

Requisition ID: R-150987