• Own and deliver robust, high-scale routing experiences for the Data platform/ pipelines team for Twilio Segment. • Architect and operate always-available, complex distributed systems in cloud environments. • Guide technical decisions, articulating trade-offs between cost, performance, and reliability. • Translate complex technical strategies into actionable plans for diverse stakeholders, including Product Managers and Architects

• Design and deliver robust, high-scale routing experiences for the Data platform/ pipelines team for Twilio Segment. • Ship features that opt for high availability and throughput with eventual consistency • Collaborate with engineering and product leads, as well as teams across Twilio Segment • Support the reliability and security of the platform • Build and optimize globally available and highly scalable distributed systems • Be able to act as a team Tech Lead as needed • Mentor other engineers on the team in technical architecture and design • Partner with application teams to deliver end to end customer success.

• Implement new features, enhancements, and bug fixes across the integration platform — owning your work items from design through production under the technical direction of the Principal Engineer. • Write clean, maintainable, production-quality code across the integration stack — C#/.NET, Oracle SQL/PL/SQL, REST API services, file processing pipelines, and background job logic. • Build and maintain file-based integration logic — CSV and fixed-width parsing, PGP encryption/decryption, SFTP file transfer, archive management, and broker-specific file format handling. • Implement and maintain REST API endpoints and background processing pipelines under the architectural direction of the Principal Engineer. • Make database changes to support integration tasks — including schema updates, stored procedures, and SQL query development and optimization. • Participate actively in agile ceremonies — sprint planning, refinement, standups, demos, and retrospectives. • Leverage AI tooling actively throughout feature development — from accelerating implementation and debugging to generating tests and documentation.

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 Foundry R&D Software Engineer II 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 Mastercard is looking for a talented Software Engineer to join the Mastercard Foundry Research and Development team in our Dublin Tech Hub. In this role you will be part of a highly agile team building exiting and innovative products delivered at scale to global markets. 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 to market. Role This role involves working with a team of talented developers to develop high performance Java based solutions. In this role, you will be responsible for: • Design and implementation of innovative capabilities using AI Tooling. • Work as part of an agile team. • Work closely with technical leads and other developers to define solutions. • Research alternative technical solutions to meet changing business needs. • Produce design and research documentation. • Transitioning R&D solutions to Mastercard core. Skills • Proficiency with Java JDK 17 or greater. • Knowledge of Tomcat, Spring, Spring Boot, Shell Scripting, JSON. • Experience with Docker, Kubernetes or other container orchestration solutions. • Expertise in Junit or other automated unit testing frameworks. • Experience with a UI framework such as React. • Knowledge of CI/CD principles and tools such as Jenkins, Gradle, Maven. • Passionate about software development and comfortable in a fluid environment. • Knowledge of Source Control Management and working with code in a multi-developer environment. • Knowledge of or passion for mobile application development would also be an advantage • Demonstrates hands-on knowledge of agents, skills, MCP integration, and practical AI workflow concepts. Other • Excellent communication (verbal and written) and strong collaboration skills. • Show initiative and demonstrate a willingness to take on challenging opportunities. • Passionate about code quality and coding best practices. • Highly motivated and a strong team-player. 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.