Principal 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 Principal Engineer Overview In the milliseconds between when a card is swiped and an approval is returned, Authorization Decisioning delivers more than 20 market-facing services—including industry leading fraud detection—at global scale. Every day, our platforms apply advanced computational intelligence to billions of transactions worldwide, forming part of the critical financial infrastructure for multiple nation states. As a Principal Software Engineer, you are a technical authority and wayfinder. You provide broad technical leadership across engineering, architecture, product, and operations, shaping the evolution of a highly available, high throughput, globally distributed platform. You are hands-on and influential—experimenting, building, mentoring, and guiding teams from ideation through production and sustained operation. This role blends deep technical contribution with organizational leadership, driving architectural clarity, engineering excellence, and long term platform resilience. Role & Scope • 20–40% hands-on individual contributor, with the remainder focused on technical leadership, architecture, and organizational impact • Recognized as a technical expert and thought leader within a domain and across teams • Drives innovation, architectural coherence, and engineering standards across multiple services and programs • Operates effectively across organizational boundaries, partnering with product, architecture, infrastructure, security, and leadership teams Key Responsibilities Technical Leadership & Architecture • Lead the analysis, design, development, and delivery of complex, enterprise scale software solutions • Architect and evolve distributed systems, including service interactions, data flows, resiliency patterns, and operational policies • Define and evangelize reference architectures, design patterns, and run principles (e.g., active/active/active, self healing, auto scaling, poison pill) • Drive architectural decisions that balance performance, scalability, security, regulatory compliance, cost, and time to market • Participate in and lead Principal-level architecture reviews, resolving enterprise wide technical and regulatory challenges Platform & Product Impact • Collaborate with business and product partners to design and deliver new services, products, and bundles • Take ownership of the end to end customer experience across a set of services or platforms • Identify synergies and reuse opportunities across teams to reduce duplication and improve consistency • Simplify architectures and improve cost/benefit trade-offs across systems and platforms Organizational Leadership & Influence • Mentor and coach engineers at all levels; lead Guild initiatives to elevate craftsmanship across the organization • Consult across teams to guide planning, estimation, and execution for large scale, complex initiatives • Drive informed trade off discussions to align development capacity with business value drivers (regulatory, security, growth, technical debt) • Conduct technical interviews and contribute to raising the engineering bar • Write promotion recommendations based on objective assessment of impact and outcomes • Represent the organization through internal and external speaking engagements, white papers, and technical blogs • Actively identify and address siloed behaviors, fostering collaboration and shared ownership About You • You have built your career designing and delivering high per ... (truncated, view full listing at source)