Mastercard is looking for a Senior Principal Software Development Engineer to join the Mastercard Foundry Research and Development team in our Toronto location In this role, you will establish the technical direction for complex, early-stage products, drive architecture decisions across teams, and bring cutting-edge solutions to global markets at enterprise scale The Senior Principal Software Engineer thrives on setting direction where product concepts are ambiguous, aligning engineering choices to commercial outcomes Our team is built on a foundation of research and development, mining innovation internally, innovating new product lines with emerging technology, managing new products from inception to market validation and engaging strategically with start-ups to shape the future of commerce with and for our customers At Mastercard you will help define the future of commerce globally This team will have a diverse focus both in terms of geography and variety of technology challenges driving hard to bring innovative payment solutions and services to market As a Senior Principal Software Engineer on the R&D; team, you will be at the forefront of the design of complex, large-scale new product concepts spanning Mastercard’s business units Define highly scalable solution architectures for complex, early-stage product concepts across technology stacks, data platforms, and environments Establish engineering best practices that accelerate responsible use of AI across solution architecture and software delivery, including patterns for AI-assisted development, evaluation, observability, and production readiness Set technical direction for complex applications, interfaces, and integrations from concept through implementation, deployment, and release Set technical strategy and lead architecture implementation for Data Platforms in Foundry R&D;, creating reusable patterns that can scale across products Influence technical direction across R&D;, product, and technology teams, creating alignment on tradeoffs,



delivery risks, and long‑term platform choices Identify high-impact technical risks, make architecture decisions under uncertainty, and design experiments or prototypes to de‑risk product concepts before market validation Act as a force multiplier for engineering excellence by coaching senior engineers, reviewing critical designs, raising quality standards, and creating technical practices that improve delivery across teams Demonstrated ability to set technical strategy for complex initiatives, make architecture decisions under uncertainty, and influence senior technical and business stakeholders without direct authorityUses AI to innovate on and improve individual and team engineering practicesHands-on experience architecting and building 0-to-1 applications using Generative AI, LLMs, or agentic patternsExcellent verbal and written communication and cross-functional collaboration skillsExperience representing technical work through internal forums, external conferences, publications, open-source contributions, patents, or other thought leadership channelsStrong working knowledge of AI/ML, data analytics, and data product development with emphasis on data quality, data privacy, and localizationStrong business acumen and ability to apply technology to solve business problemsProven track record raising the technical capability of senior engineers and teams through coaching, design review, standards-setting, and technical leadershipDeep experience with one or more modern AI frameworks and SDKs for agent orchestration, AI application development, or coding-agent workflows, such as LangGraph, OpenAI Agents SDK, or Codex SDKExpertise in cloud platforms such as Databricks, Snowflake, AWS, and AzureExpertise with Java, Spring Boot, React, Typescript, Postgres, and other object-oriented languages, front-end frameworks, and database technologiesProven track record creating reusable architecture patterns, platforms, or engineering practices that accelerate delivery, reduce technical risk, or improve quality across an organization

📌 Senior Principal Software Engineer (Toronto)
🏢 Mastercard
📍 Toronto