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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Software Engineer II - **Company:** Mastercard - **Location:** O'Fallon, MO, United States - **Salary:** $92,000.0 - $147,000.0 - **Contract:** Permanent contract - **Skills:** Amazon Web Services, Software Applications, Automation of Tests, Microsoft Azure, Behavior-Driven Development, Software Quality, Code Review, Cyber Security, Continuous Integration, Data Structures, Distributed Systems, HP Systems Insight Manager, Open Web Application Security, Scrum Methodology, Software Architecture, Software Engineering, Software Systems, SONAR (Symantec), Software Vulnerability Management, Software Troubleshooting, Veracode, Solid Principles, Information Technology, Deployment Automation, Checkmarx, Jenkins, Artifactory - **Published:** August 12, 2026 - **Apply:** https://mastercard.wd1.myworkdayjobs.com/CorporateCareers/job/OFallon-Missouri/Software-Engineer-II_R-287461 ## About the Role Understanding of software design principles, software architecture, data structures, and algorithms with the ability to build maintainable and scalable solutions. Experience applying secure coding practices and familiarity with industry standards such as OWASP, CWE, and SEI CERT. Knowledge of vulnerability management and experience utilizing code quality and security scanning tools such as Sonar, Checkmarx, Veracode, Zally, or similar solutions. Understanding of core engineering principles required to build and operate mission-critical applications, including security, reliability, scalability, performance, operability, testing, and customer experience. Experience designing and maintaining unit, functional, integration, and automated tests. Familiarity with test automation concepts, behavior-driven development (BDD), and test pyramid methodologies. Experience participating in code reviews and troubleshooting application and production issues within distributed systems. Ability to collaborate effectively with engineering teams and business stakeholders to estimate requirements and prioritize work based on business value. Understanding of domain-driven design concepts and the ability to apply business requirements to software solutions. Experience working with CI/CD pipelines and release automation tools such as Jenkins, Azure DevOps, AWS pipelines, XL Release, or similar technologies. Familiarity with build, artifact, and dependency management tools such as Artifactory, JFrog, or equivalent platforms. Experience supporting application monitoring, observability, performance analysis, and operational health using industry-standard tools. Experience building and supporting highly available production systems. Experience with cryptography, encryption technologies, or security-focused applications is preferred. Payment industry experience is preferred but not required. Bachelor's degree in Computer Science, Software Engineering, Information Technology, or a related field, or equivalent practical experience. ## Description As a Software Engineer II at Mastercard, you will contribute to the design, development, testing, deployment, and support of software solutions that power critical business capabilities. You will work collaboratively with engineers, product partners, and stakeholders to deliver scalable, secure, high-quality software while continuing to grow your technical expertise and business knowledge. You will independently execute assigned workstreams and contribute to technical discussions, code reviews, and continuous improvement initiatives across the team. Role Responsibilities Participate in team prioritization discussions with Product and Business stakeholders to understand requirements and delivery objectives. Estimate and deliver assigned work, including design, development, testing, deployment, configuration, and documentation activities. Contribute to code, design, and process discussions, helping evaluate trade-offs and identify practical solutions. Participate in sprint planning, backlog refinement, demos, and acceptance discussions with Product Owners and stakeholders. Develop an understanding of the end-to-end technical architecture, business domain, and system dependencies related to supported applications. Design, develop, test, and maintain software applications and services that meet security, scalability, resiliency, and performance requirements. Participate in code reviews and provide constructive feedback to support code quality, maintainability, and engineering standards. Support implementation of engineering best practices, technology standards, and established development frameworks. Troubleshoot application, system, and production issues, working with team members to identify root causes and implement solutions. Contribute to CI/CD pipelines, deployment automation, and operational readiness activities. Support and guide new team members through knowledge sharing and collaboration. Identify opportunities to improve processes, reduce inefficiencies, and enhance team productivity. Share knowledge, reusable components, patterns, and best practices across teams, guilds, and engineering communities., 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. ## Related Videos - [Securing Your Web Application Pipeline From Intruders](https://www.wearedevelopers.com/videos/53-securing-your-web-application-pipeline-from-intruders) - [Security Pitfalls for Software Engineers](https://www.wearedevelopers.com/videos/726-security-pitfalls-for-software-engineers) - [The Road to MLOps: How Verivox Transitioned to AWS](https://www.wearedevelopers.com/videos/1050-the-road-to-mlops-how-verivox-transitioned-to-aws) - [Enterprise-Cloud-Native - Fast-Paced Development & Deployment in a Highly Secure Banking Environment](https://www.wearedevelopers.com/videos/671-enterprise-cloud-native-fast-paced-development-deployment-in-a-highly-secure-banking-environment) - [Migrating half a million users to a new payment service provider](https://www.wearedevelopers.com/videos/730-migrating-half-a-million-users-to-a-new-payment-service-provider) - [Our GitOps approach for deploying an Identity Provider and an API Gateway in a SaaS company](https://www.wearedevelopers.com/videos/776-our-gitops-approach-for-deploying-an-identity-provider-and-an-api-gateway-in-a-saas-company) ## Related Articles - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [Top-Paying Tech Jobs (with Salaries)](https://www.wearedevelopers.com/magazine/372-top-paying-tech-jobs-with-salaries) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [Best Paying Jobs in Technology](https://www.wearedevelopers.com/magazine/256-best-paying-jobs-in-technology) - [Best Countries for Software Engineers](https://www.wearedevelopers.com/magazine/267-best-countries-for-software-engineers)