Senior Software Engineer

Our Purpose Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we’re helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential. Title and Summary Senior Software Engineer Overview Mastercard is a global technology company in the payments industry, focused on powering an inclusive, digital economy that makes transactions safe, simple, smart, and accessible. Using secure data and networks, our innovations enable individuals, financial institutions, governments, and businesses worldwide to realize their greatest potential. Role Within Mastercard’s Builders Enablement Program (ONE Division), we are building a standardized, secure, cloud first software delivery ecosystem and delivering a world class developer experience. We are seeking a Senior Software Engineer to design, build, and enhance software applications and developer-facing experiences that empower engineers across Mastercard's software delivery ecosystem. This role requires deep expertise in software architecture, application development, user experience, and distributed systems, combined with full lifecycle ownership from design through production operations. About the Role Software Development • Design, develop, test, and support scalable cloud-native applications and services • Build and maintain backend solutions using Java and Spring Boot • Develop and enhance modern user interfaces using React and TypeScript • Design and implement REST APIs and service integrations across the Developer Experience ecosystem • Build integrations with developer tools including Jenkins, GitHub, Bitbucket, SonarQube, Workday, and related engineering platforms • Contribute to internal developer portals using Backstage or similar frameworks • Help improve engineering productivity through automation, self-service capabilities, and platform standardization Software Development Excellence • Own delivery of robust, secure, and high-performance software across backend platforms and frontend applications (React, TypeScript) • Drive engineering excellence in coding standards, modular design, and maintainability • Design and develop software solutions that improve developer productivity and streamline software delivery workflows using Backstage or similar frameworks and extensible plugin-based architectures. • Build modern, data-driven user experiences that transform engineering and operational data into actionable insights for software development teams. Testing Strategy & Quality Engineering • Define and implement comprehensive testing strategies, including: • Unit testing • Integration testing • Functional/end-to-end testing • Embed automated testing within CI/CD pipelines to enforce quality gates and prevent regressions • Ensure systems meet correctness, reliability, and backward compatibility requirements at scale Performance Engineering • Lead performance engineering initiatives, including system benchmarking, load testing, and capacity planning • Analyze application and service performance, optimize system responsiveness, and improve scalability across highly distributed software systems. • Ensure applications meet strict performance SLAs in high-volume, mission-critical environments Secure Coding & Compliance • Enforce secure coding practices and integrate security into every phase of the SDLC • Design systems that meet enterprise security, regulatory, and compliance requirements • Partner with securi