Senior Software Engineer

Mastercard•O'fallon, MO
•$115,000 - $184,000•Hybrid

About The Position

The Small and Medium Enterprises (SME) Partnerships and Loyalty team is seeking a Senior Software Engineer to apply full-stack expertise in designing, building, deploying, and scaling real-time, interactive applications used by thousands of clients worldwide. The role involves a broad range of responsibilities, including front-end web development, server-side logic, and database management. The ideal candidate will be hands-on, with a strong focus on UI development, API integration, and building cloud-native solutions that operate at a global scale and handle high-volume workloads. In this role, you will work within an agile development methodology, collaborating with other technical delivery teams while mentoring junior engineers to deliver robust, high-quality solutions for new features and services. All team members contribute to the design, development, and testing of features. This is a hybrid position based in Atlanta, GA, with optional O’Fallon, MO, requiring three days per week onsite.

Requirements

  • Extensive experience developing enterprise-scale full-stack applications, with strong expertise across backend services, frontend development, and database technologies.
  • Extensive experience designing and developing Java applications, Spring Boot services, RESTful APIs, and microservices in enterprise environments.
  • Strong hands-on experience with React, Angular, JavaScript/TypeScript, and responsive web application development.
  • Proven experience designing and developing modern, responsive, and intuitive user interfaces that deliver engaging and effective user experiences.
  • Strong database design, data modeling, SQL, NoSQL, PostgreSQL, Snowflake, query optimization, and performance tuning skills.
  • Strong understanding of microservice architecture, distributed systems, API design, and cloud-native development practices, Azure experience preferred.
  • Strong understanding of object-oriented design principles, design patterns, data structures, algorithms, and software architecture.
  • Experience designing and developing event-driven applications, scalable distributed systems, and data-intensive applications.
  • Experience using AI-assisted software development tools, such as GitHub Copilot, to improve productivity and software quality across coding, refactoring, testing, debugging, documentation, and delivery.
  • Strong understanding of modern software engineering practices, including automated testing, CI/CD, Git-based development, code reviews, observability, and operational readiness.
  • Demonstrated ability to operate effectively in an Agile engineering environment, contributing to collaborative technical decision-making and continuous improvement.
  • Ability to work independently, manage competing priorities, and make thoughtful technical decisions with minimal supervision.
  • Strong communication and collaboration skills, with the ability to explain technical concepts and influence decisions across technical and non-technical audiences.
  • Bachelor’s degree in Computer Science, Engineering, Information Systems, or a related field, or equivalent practical experience.

Responsibilities

  • Design, build, test, deploy, and enhance full-stack applications using Java, Spring Boot, React, Angular, PostgreSQL, SQL, NoSQL, and Snowflake.
  • Develop scalable microservices, REST APIs, and distributed systems that support real-time analytics, reporting, and data-driven applications.
  • Build intuitive, responsive, and high-performing user interfaces that transform complex data into meaningful insights and deliver exceptional customer experiences.
  • Translate business and product requirements into secure, scalable, maintainable, and testable software solutions.
  • Design, develop, and optimize database structures, queries, and data models for large-scale, data-intensive applications.
  • Apply strong software engineering principles, including object-oriented design, design patterns, data structures, algorithms, automated testing, code reviews, and CI/CD.
  • Collaborate with Product Managers, Architects, Engineers and other stakeholders across global teams to deliver customer-focused solutions.
  • Continuously improve application performance, reliability, security, observability, and operational excellence.
  • Contribute to Agile planning, estimation, prioritization, and delivery while taking ownership of technical outcomes.
  • Leverage AI-assisted development tools, including tools such as GitHub Copilot, to accelerate coding, refactoring, testing, debugging, documentation, code reviews, and other software development activities, with appropriate engineering judgment and human oversight.
  • Mentor team members, share technical knowledge, and help foster a culture of engineering excellence and continuous improvement.

Benefits

  • insurance (including medical, prescription drug, dental, vision, disability, life insurance)
  • flexible spending account and health savings account
  • 16 weeks of new parent leave
  • up to 20 days of bereavement leave
  • 80 hours of Paid Sick and Safe Time
  • 25 days of vacation time
  • 5 personal days
  • 10 annual paid U.S. observed holidays
  • 401k with a best-in-class company match
  • deferred compensation for eligible roles
  • fitness reimbursement or on-site fitness facilities
  • eligibility for tuition reimbursement
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