# Senior, Software Engineer at Mastercard

Mastercard is hiring a Senior, Software Engineer. Level rates it Little AI ●○○○; you can [apply on Mastercard](https://jobsbylevel.com/go/5d07e78c-f1f5-45f9-94b0-46668ad8b346?utm_medium=ai-agent).

AI Level 1, AI centrality 36 out of 100. O'Fallon, Missouri.

## Details

- Company: [Mastercard](https://jobsbylevel.com/companies/mastercard)
- AI level: AI Level 1 (score 36 out of 100)
- Location: O'Fallon, Missouri
- Posted: October 20, 2026
- Apply: https://jobsbylevel.com/go/5d07e78c-f1f5-45f9-94b0-46668ad8b346?utm_medium=ai-agent

## 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 Senior, Software Engineer Overview The Decision Management Program (DMP) delivers industry‑leading intelligence that enables faster, smarter decisioning at global scale across the payment journey and beyond. Through a suite of products, DMP structures and applies complex business logic to help teams manage risk, adapt quickly to changing regulatory, geopolitical, or market conditions, and drive profitable customer engagements. Built for resiliency, availability, and future growth, DMP empowers Mastercard’s market-facing programs with agile, intelligent decision management capabilities worldwide. A Senior Software Engineer is an experienced individual contributor who designs, develops, tests, deploys, and maintains complex backend software applications and services, with a strong focus on Java-based development. This role applies deep technical expertise to solve nontrivial engineering problems, influence design decisions, and improve engineering practices while collaborating closely with product, operations, and other stakeholders. Senior Software Engineers operate with a high degree of autonomy, contribute across the full software development lifecycle, and raise the technical bar through backend development, code quality, automated testing, system design, secure engineering practices, and knowledge sharing. Role Responsibilities •Own software delivery activities at the application or software-component level, including backend development, testing, deployment, release, configuration, and documentation. •Design and develop scalable, secure, reliable, and maintainable Java-based applications, APIs, services, and backend components. •Translate business and technical requirements into scalable, secure, reliable, and maintainable software designs. •Develop high-quality Java software using appropriate algorithms, data structures, coding standards, and engineering best practices. •Design, develop, and maintain automated unit, functional, integration, and regression tests to validate software functionality, service interactions, and code changes. •Incorporate test automation and regression testing into the software development lifecycle to support code quality and reliable releases. •Troubleshoot, diagnose, and refactor existing code to improve quality, maintainability, performance, and reliability. •Apply secure coding practices throughout the software development lifecycle to identify and reduce application vulnerabilities. •Adopt new programming languages, frameworks, and architecture patterns based on business and technical needs. •Participate in the team’s agile processes, technical decisions, backlog refinement, and prioritization activities. •Deliver prioritized backlog work in partnership with the full scrum team, seeking guidance when appropriate. •Automate software build, testing, deployment, operational, and runtime processes. •Lead code, design, and process trade-off discussions within the team when required. •Drive the integration of backend services and APIs with a focus on the customer journey and overall experience. •Perform product demonstrations and participate in acceptance discussions with Product Owners. •Improve operational readiness by incorporating reliability, observability, monitoring, and measurable engineering practices into software solutions. •Analyze and optimize applications and services for performance and scalability through testing, tuning, and ongoing evaluation. •Develop a

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Source: https://jobsbylevel.com/jobs/senior-software-engineer-at-mastercard-6bdf26

## Cite this page

Level. https://jobsbylevel.com/jobs/senior-software-engineer-at-mastercard-6bdf26.

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