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# Senior Software Engineer

- **Company:** Mastercard
- **Location:** O'Fallon, MO, United States
- **Experience:** Expert
- **Salary:** $115,000.0 - $184,000.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Amazon Web Services, Build Automation, Behavior-Driven Development, Software Quality, Code Review, Cyber Security, Data Structures, Distributed Systems, Machine Learning, Open Web Application Security, Performance Tuning, Software Architecture, Secure Coding, Software Engineering, Software Systems, SONAR (Symantec), Software Vulnerability Management, Software Application Programming, Veracode, Information Technology, Production Code, Checkmarx, Pyramid, Domain Driven Design, Atlassian Bamboo, Jenkins, Vulnerability Analysis, Artifactory
- **Published:** August 29, 2026
- **Apply:** https://mastercard.wd1.myworkdayjobs.com/CorporateCareers/job/OFallon-Missouri/Senior-Software-Engineer_R-288843-1

## About the Role

* Skillful at writing secure code in multiple languages; Familiar with secure coding standards (e.g., OWASP, CWE, SEI CERT) and vulnerability management
 * Understands the basic engineering principles used in building and running mission critical software capabilities (security, scalability, resiliency, performance, operability, customer experience, testing, and simplification)
 * Strong understanding of software design, software architecture, data structures, and algorithms, with the ability to develop scalable and maintainable solutions.
 * Proficient in authoring test code with lots of smaller tests followed by few contract tests at service level and fewer journey tests at the integration level (Test Pyramid concept)
 * Apply tools (e.g., Sonar, Zally, Checkmarx) and techniques to scan and measure code quality and anti-patterns as part of development activity
 * Experience conducting code reviews and troubleshooting complex application and production issues in distributed systems.
 * Proficient in collaborating with team and business stakeholders to estimate requirements (e.g., story pointing) and prioritize based on business value
 * Able to perform domain-driven design to architect and map software solutions to business contexts
 * Proficient in orchestrating release workflows and pipelines, and apply standardized pipelines via APIs to achieve CI and CD using industry standard tools (e.g., Jenkins, AWS/Azure pipelines, XL Release, others); Able to configure rules and build automation for code with vulnerability scanning and software composition analysis using standard tools (e.g., Sonar, Checkmarx, JFrog XRay, Veracode, others)
 * Manage builds and artifacts leveraging standard tools (e.g., Artifactory) to ensure error-free deployment of production code using canary and or blue-green techniques
 * Experience with performance tuning, monitoring, observability, and maintaining highly available production systems.
 * Proficient in authoring test cases leveraging behavior-driven development and customer journey concepts
 * Experience developing applications which use cryptography preferred
 * Bachelor's degree in software engineering, computer science, information technology or related discipline preferred, or equivalent work experience; Payment industry knowledge preferred but not required

## Description

Software Engineers at Mastercard design and code artificial intelligence, cloud, and machine learning platforms that provide mission-critical insights to many of the world's leading organizations and governments. As a Software Engineer, you will deliver these products and solutions with speed and agility as part of a small team. This will involve developing high-performing, highly scalable software solutions and products for some of the world's top brands. Specific tasks vary depending on the project and the business unit that you join in.
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 Senior Software Engineer at Mastercard, you are expected to perform the following general responsibilities:

 * Actively participate in team prioritization discussions with Product/Business stakeholders
 * Estimate and own delivery tasks (design, dev, test, deployment, configuration, documentation) to meet the business requirements
 * Drive code/design/process trade-off discussions within their team when required
 * Perform demos/acceptance discussions in interacting with Product owners
 * Develop complete understanding of end-to-end technical architecture and dependency systems
 * Drive adoption of technology standards and opinionated frameworks, and review coding, test, and automation work of team members
 * Mentor and guide new and less-experienced team members
 * Identify opportunities to improve an overall process and trim waste; Share and seek knowledge within Guild/Program to drive reuse of patterns/libraries/practices and enhance productivity, 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.


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