Senior Software Engineer (SDET)

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 (SDET) Senior Software Engineer in Test (SDET) Overview: Who is Mastercard? Mastercard is a global technology company in the payments industry. Our mission is to connect and power an inclusive, digital economy that benefits everyone, everywhere by making transactions safe, simple, smart, and accessible. Using secure data and networks, partnerships and passion, our innovations and solutions help individuals, financial institutions, governments, and businesses realise their greatest potential. Our decency quotient, or DQ, drives our culture and everything we do inside and outside of our company. With connections across more than 210 countries and territories, we are building a sustainable world that unlocks priceless possibilities for all.

Overview The CNPF Data & AI organisation is looking for a Senior Software Engineer in Test (SDET) to help build and assure the next generation of intelligent, agentic products and platforms. This is a hands-on senior engineering role for someone who combines deep automation expertise with strong software engineering fundamentals and practical experience testing AI-powered and agent-based systems in production-grade environments. This role is ideal for a builder who enjoys solving complex quality challenges, designing scalable automation strategies, and raising the engineering bar across teams. We are particularly interested in candidates who can apply innovative thinking, strong ownership, and modern quality engineering practices to validate agentic applications, LLM-powered workflows, APIs, user journeys, and end-to-end platform reliability. We are seeking a talented Senior Software Development Engineer in Test (SDET) to define and implement an effective automation and quality strategy within an Agile team. This role will validate application functionality, resilience, and business outcomes using modern testing methodologies, strong engineering discipline, and best practices in continuous integration and delivery. Role: • Own end-to-end quality engineering for agentic applications, intelligent workflows, APIs, user interfaces, and supporting platform services. • Design, develop, and maintain robust automation frameworks for UI, API, integration, regression, and system-level testing. • Define test strategies for AI and agent-based systems, including workflow validation, response quality, tool usage, guardrails, reliability, and failure handling. • Build automated quality gates for CI/CD pipelines and ensure high-confidence releases through continuous testing. • Partner closely with software engineers, product managers, architects, and data/AI teams to ensure quality is built in from design through production. • Create meaningful test data, validate edge cases, identify defects early, and drive root cause analysis through to resolution. • Evaluate non-functional characteristics such as performance, reliability, observability, resilience, and scalability. • Contribute innovative ideas that improve testability, developer productivity, release confidence, and engineering effectiveness. • Demonstrate strong ownership by proactively identifying gaps, driving improvements, and mentoring team members on automation and quality best practices. About You • Strong experience in software test automation, automation framework design, and code quality practices. • Proven ability to test modern distributed systems, APIs,