Software Engineer II

Mastercard
O'Fallon, Missouri$92k – $147kPosted 7 April 2026

Job Description

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 What role do we play in the modern world? Are we an enabler of purchases or a facilitator for transactions? We play a much larger role in the world by enabling those that have no access to financial systems – every employee has the opportunity to be a part of something bigger and to change lives. We have the technology, people and Brand to serve modern society. Today, we are a global tech company that connects everyone to endless possibilities, priceless possibilities. About the Role Single Message Authorization 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. Role 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 the ability to write secure code in Java or C++ programming language, and is familiar with secure coding standards (e.g., OWASP, CWE, SEI CERT) • Proven experience working in Unix/ Linux systems • Understands and implements standard branching (e.g., Gitflow) and peer review practices • Has a basic understanding of using and accessing relational databases and SQL queries • 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 how they are matched to project needs • 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, ... (truncated, view full listing at source)
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