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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Principal Software Engineer - **Company:** Mastercard - **Location:** O'Fallon, MO, United States - **Salary:** $170,000.0 - $281,000.0 - **Contract:** Permanent contract - **Skills:** Computer-Aided Design, Agile Methodology, Artificial Intelligence, Amazon Web Services, Application Frameworks, Software Applications, Microsoft Azure, Big Data, Cloud Computing, Cyber Security, Data Architecture, Data Governance, Data Infrastructure, Extract Transform Load (ETL), Data Systems, Data Warehousing, Database Design, Distributed Computing Environment, Fault Tolerance, Apache Hadoop, Apache Hive, Spring Framework, Machine Learning, Oracle (Applications), Software Architecture, Redis, Software Engineering, Privacy Controls, Snowflake, Apache Spark, Generative AI, Information Technology, Api Design, Restful APIs, Data Pipelines, Databricks, Microservices - **Published:** October 30, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=527bf1037d8c1a18 ## About the Role * Bachelor's degree in Information Technology, Computer Science, or a related field. * Extensive software development experience with a strong track record of delivering enterprise-grade solutions. * Desired strong knowledge of card ecosystem including, Loyalty, Clearing, Fraud, Disputes, Issuer, Acquirer & Merchant domains. * Deep understanding of software engineering concepts, methodologies, and Agile/SAFe Agile practices. * Proven expertise in software architecture, design, and application development. * Strong communication skills (verbal and written) and the ability to quickly learn and apply new technologies and frameworks. * High energy, detail-oriented, proactive, and capable of working under pressure to meet deadlines. * Strong collaboration and organizational skills with a high degree of initiative and self-motivation. * Ability to work effectively in a matrixed, geographically distributed team environment. * Excellent troubleshooting skills and a proactive approach to problem-solving. * Experience building high-performing, secure applications with a strong grasp of architecture, performance, and security principles. * Proficiency in Java-based systems and services, cloud technologies (Azure/AWS), AI/ML, Gen AI and microservices architecture. * Expertise in Spring, RESTful services, API design principles, and best practices. * Familiarity with data modeling, database design, data warehousing, Oracle, Redis, and reporting technologies. * Strong knowledge of Mastercard privacy by design * Knowledge of enterprise-level application frameworks and tools. Big Data & Analytics Expertise: * Experience designing and architecting high-volume data systems using technologies such as Hadoop, Snowflake, Databricks, and other modern data platforms. * Strong understanding of data pipelines, ETL/ELT processes, and distributed data processing frameworks (e.g., Spark, Hive). * Ability to build scalable, fault-tolerant data architectures that support real-time and batch analytics. * Familiarity with data governance, data quality, and security best practices in large-scale data environments. Preferred Qualifications: * Experience in the Core payments, Loyalty, Fraud domains. * Passion for building innovative solutions that positively impact global payments. * Data-savvy mindset with an understanding of how data enhances convenience and security in payments. * Clear mission focus aligned with business objectives and team success. * Strong stakeholder management and expectation-setting skills. * Confident communicator with the ability to articulate technology vision and roadmaps to diverse audiences. * Problem-solver with a results-driven mindset. ## Description * Collaborate with stakeholders across Product, Technical, Business Operations, and other Mastercard teams to understand product requirements and lead the design and architecture of scalable solutions. * Design software architecture in alignment with Mastercard standards and present solutions to the Solution Architecture Board for approval. * Develop and support application software in adherence to Mastercard's standards, processes, and best practices. * Deliver high-quality, secure, and scalable software solutions aligned with the product roadmap, within time and budget constraints. * Research and evaluate technical solution alternatives to meet business needs. * Create and maintain system and testing documentation per departmental standards. * Ensure compliance with audit requirements and Mastercard's QA/QC processes. * Modernize and simplify existing architectures to enhance scalability, performance, and operational efficiency. * Champion engineering excellence through hands-on contributions and collaborative leadership. * Support the collection and reporting of project and software metrics. * Mentor and coach team members to foster engineering leadership., 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.