Senior Software 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
Senior Software Engineer
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 realize 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
Payments Network Technology is seeking a Senior Software Engineer to design, develop, and support payment processing applications and customer integration solutions. The role combines hands-on Java development with automation and validation of end-to-end transaction flows across authorization, clearing, tokenization, and related payment network services.
Roles and Responsibilities• Design, develop, test, and support Java-based applications and APIs for payment processing platforms.• Build and maintain automated validation frameworks using Java, Cucumber, JUnit/TestNG, and API automation tools.• Develop solutions supporting authorization, clearing, tokenization, settlement, and transaction processing workflows.• Partner with customers, product teams, and engineers to support onboarding, integration testing, and production readiness.• Create automated validation for ISO 8583 messages, transaction routing, response handling, and exception scenarios.• Analyze defects, troubleshoot complex issues, and drive resolution across multiple systems and teams.• Contribute to architecture, code reviews, CI/CD pipelines, and operational excellence initiatives.• Guide less-experienced engineers and independently own features from design through production support.
Essential Skills• Strong software development experience with Java, Spring Boot, REST APIs, and distributed systems.• Hands-on experience with Cucumber, JUnit/TestNG, Rest Assured, Selenium, or similar Java-based automation frameworks.• Experience developing and supporting enterprise-scale applications.• Understanding of ISO 8583 messaging and payment transaction processing.• Knowledge of authorization, clearing, tokenization, settlement, and payment lifecycle flows.• Experience working directly with customers or integration partners.• Strong debugging, analytical, and problem-solving skills.• Bachelor's degree in Computer Science, Engineering, or related field, or equivalent practical experience.
All About You• Hands-on software engineer with experience delivering scalable, reliable applications.• Experience combining application development with automation engineering.• Strong understanding of software quality, testing strategies, and automation-first development practices.• Experience working in Agile delivery environments across the software development lifecycle.• Ability to collaborate with globally distributed product, engineering, architecture, operations, and customer-facing teams.• Experience applying AI-assisted engineering tools, including GitHub Copilot and Claude CLI.• Payments or financial services experience, including customer onboarding and transaction processing, is preferred
Corporate Security Responsibility
All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must:

• Abide by Mastercard's security policies and practices;
• Ensure the confidentiality and integrity of the information being accessed;
• Report any suspected information security violation or breach, and
• Complete all periodic mandatory security trainings in accordance with Mastercard's guidelines.