# Lead Software Engineer at Mastercard

Mastercard is hiring a Lead Software Engineer. Level rates it Little AI ●○○○; you can [apply on Mastercard](https://jobsbylevel.com/go/2e1131f4-a2fb-4db4-bf92-21309b114e35?utm_medium=ai-agent).

AI Level 1, AI centrality 0 out of 100. O'Fallon, Missouri.

## Details

- Company: [Mastercard](https://jobsbylevel.com/companies/mastercard)
- AI level: AI Level 1 (score 0 out of 100)
- Location: O'Fallon, Missouri
- Posted: September 28, 2026
- Apply: https://jobsbylevel.com/go/2e1131f4-a2fb-4db4-bf92-21309b114e35?utm_medium=ai-agent
- Free CV review for this job: https://jobsbylevel.com/cv-review?job=lead-software-engineer-at-mastercard-fac6b4

## Prepare for this job

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## Description

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 Lead Software Engineer Our Purpose We connect and power an inclusive digital economy that benefits everyone, everywhere. We enable safe, simple, smart, and accessible transactions through secure data, strong networks, partnerships, and innovation. Our culture is driven by our Decency Quotient (DQ), fostering inclusion, respect, and diversity. We believe that diverse perspectives strengthen decision-making, drive innovation, and deliver better business outcomes. The Mastercard Authentication Program owns how consumer authentication works for both in-store and e-commerce transactional use cases. The primary purpose of this role is to develop and deliver best-of-breed authentication products for e-commerce transactional use cases that will drive uptake and penetration for the products and revenue for Mastercard. The authentication Onboarding and configuration platform If you want a challenging project that is changing the way people make payments, this is the role for you! As a Lead Software Engineer, you will be responsible for: • Design and develop secure, reliable, maintainable, and scalable solutions for globally distributed, customer-facing products. • Support development teams and collaborate with stakeholders while promoting agile development practices. • Create a culture of technical excellence, engineering quality, and innovation. • Research, develop, and evaluate technical solution alternatives for business needs using current and emerging technologies and frameworks. • Drive advanced testing strategies, including automation, chaos engineering, and resilience testing, to validate system behavior under failure conditions. • Remain hands-on by contributing to code, including building services and APIs; writing unit, functional, integration, and acceptance tests; and developing architecture fitness functions. • Partner with business and product owners to architect and deliver services that support new products and bundles. • Participate in team agile processes, including prioritization, trade-off discussions, and delivery planning. • Drive architectural design across dependent services, service interactions, and policies. • Design solutions for operational readiness, observability, reliability, and effective production support. • Lead the diagnosis and resolution of complex system issues by applying structured troubleshooting and root-cause analysis practices. • Take ownership of improving the customer experience across a portfolio of services and applications. • Lead and contribute to initiatives that improve software engineering craftsmanship, including mentoring engineers at all levels. • Consult across teams and organizational boundaries to identify synergies and opportunities for reuse. • Conduct technical interviews and help raise the engineering talent bar. Code Quality and Review Responsibilities • Conduct and lead code reviews, ensuring adherence to coding standards, performance optimization, security best practices, and maintainability. • Establish and enforce code-quality governance practices, including static analysis, peer reviews, and secure coding guidelines. • Mentor engineers through code reviews by promoting clean-code principles, reusable design, and continuous improvement. • Drive consistency in development standards across teams and ensure high-quality, production-ready deliverables. Engineering Excellence and Fundamentals • Apply strong knowledge of data structures and algorithms to

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