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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Software Engineer - **Company:** Mastercard - **Location:** O'Fallon, MO, United States - **Experience:** Expert - **Salary:** $115,000.0 - $184,000.0 - **Contract:** Permanent contract - **Skills:** Testing (Software), HTML, Java (Programming Language), JavaScript (Programming Language), Amazon Web Services, Application Performance Management, Public-Key Cryptography, Microsoft Azure, Cascading Style Sheets (CSS), Cloud Computing, Code Coverage, Code Review, Cyber Security, Continuous Integration, Data Security, Data Structures, Relational Databases, DevOps, Digital Signature, Distributed Systems, Payment Systems, JQuery, PostgreSQL, Oracle (Applications), Performance Tuning, X.509, Scrum Methodology, Secure Coding, Software Engineering, Software Systems, Data Logging, Google Cloud, Cloud Platform System, Performance Testing, ReactJS, Grafana, Spring-boot, Software Security, Reliability of Systems, Backend, AngularJS, Kubernetes, Free and Open-Source Software, Front End Software Development, Restful APIs, Docker, Jenkins, Microservices - **Published:** July 8, 2026 - **Apply:** https://mastercard.wd1.myworkdayjobs.com/CorporateCareers/job/OFallon-Missouri/Senior-Software-Engineer_R-281538 ## About the Role * Strong proficiency and experience in Full Stack Software Engineering. * Strong proficiency in Java and Spring Boot framework development. * Experience designing and developing scalable microservices-based solutions. * Experience with PCF, Kubernetes, Docker, or similar cloud-native platforms. * Solid understanding of front-end engineering principles and experience with Angular or React. * Proficiency in HTML, CSS, JavaScript, and JQuery. * Experience with relational databases such as Oracle or PostgreSQL and the ability to design efficient, optimized data access solutions. * Experience with RESTful API design and development. * Experience leveraging or developing solutions using Information Security concepts including X.509, public key cryptography, JWT, hashing, and digital signatures. * Experience with software testing frameworks and methodologies. * Strong understanding of data structures, algorithms, and computational complexity with the ability to apply them to scalable, high-performance software solutions. * Experience implementing secure coding practices, application security principles, and vulnerability prevention and remediation techniques. * Experience optimizing application performance, scalability, and reliability in distributed systems. * Strong analytical, troubleshooting, and problem-solving skills. * Ability to work independently and collaboratively within cross-functional teams. Preferred Qualifications * Experience with additional cloud platforms such as AWS, Azure, or Google Cloud Platform. * Experience with DevOps practices and tools including Jenkins, Docker, Kubernetes, CI/CD pipelines, and automation frameworks. * Experience with observability tools, monitoring platforms, logging frameworks, and operational support practices. * Contributions to open-source software projects ## Description Mastercard's Network & Digital Payments group creates valued experiences for consumers, and enables merchants and issuers to reach consumers in ways not possible in the pre-digital world. The global product engineering team is responsible for development of a suite of foundational payment solutions. This an opportunity to be a part of a highly motivated team focused on bringing security, convenience and control to digital payments. * Have you ever engineered a product to market on a global scale? * Are you motivated to be a part of driving a world beyond cash? * Are you agile with a desire to exhibit your skills at the cutting edge with a high standard for excellence?, * Design, develop, and maintain robust and scalable backend services using Java, Spring Boot, and microservices architecture. * Deploy, manage, and optimize applications running on PCF, Kubernetes, and cloud-native environments. * Develop engaging and responsive user interfaces using modern front-end frameworks such as Angular or React. * Participate in Proof of Concepts (PoCs) and contribute to the evaluation and selection of vendor solutions, technologies, frameworks, and engineering methodologies. * Write clean, maintainable, well-documented, secure, and testable code following engineering standards and best practices. * Collaborate with product managers, designers, architects, and engineering teams to deliver high-quality software solutions. * Lead and participate in code reviews, promoting engineering excellence, maintainability, secure coding practices, and adherence to architectural standards while helping other engineers improve technical quality. * Troubleshoot and resolve complex technical issues across applications, services, and infrastructure while driving root-cause analysis and long-term corrective actions. * Ensure adequate test coverage through unit, functional, integration, and performance testing practices. * Contribute to and influence the architecture and design of software systems, ensuring scalability, resiliency, maintainability, and security. * Analyze application performance, conduct scalability assessments, identify bottlenecks, and implement performance tuning strategies to optimize system reliability and efficiency under varying workloads. * Apply secure coding standards and security best practices throughout the software development lifecycle, proactively identifying and remediating security vulnerabilities. * Design and implement observability, monitoring, logging, and operational readiness capabilities to support system reliability, supportability, and incident response. * Mentor junior engineers, share technical expertise, and provide guidance on engineering best practices. * Work in an Agile environment, participating in sprint planning, daily stand-ups, retrospectives, and continuous improvement activities., 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 - [The Resilience of the World Wide Web](https://www.wearedevelopers.com/videos/1281-the-resilience-of-the-world-wide-web) - [WeAreDevelopers LIVE - the weekly developer show with Chris Heilmann and Daniel Cranney](https://www.wearedevelopers.com/videos/1309-wearedevelopers-live-the-weekly-developer-show-with-chris-heilmann-and-daniel-cranney) - [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) - [NoLoJS - Avoiding JavaScript Cruft with HTML and CSS - Aaron T. 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