Software Engineer II - Integrations & API Connectivity

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
Software Engineer II - Integrations & API Connectivity
Overview
Mastercard is a global technology company powering an inclusive, digital economy, enabling secure and seamless transactions across 210+ countries.
This role sits within Mastercard's Open Finance Europe - Connectivity team, responsible for building and operating scalable API integrations with financial institutions across Europe.
As a Software Engineer II, you will be a hands-on engineer responsible for building, testing, and supporting secure, reliable backend services. You will contribute to the development of scalable solutions, collaborate with experienced engineers on system design and implementation, and help deliver high-quality software that operates in production environments.
What You'll Do• Develop, test, and support scalable APIs and backend services• Contribute to the design and implementation of reliable, maintainable software solutions• Deliver high-quality code throughout the software development lifecycle• Troubleshoot and resolve application and production issues under guidance from senior team members• Participate in code reviews and follow established engineering best practices and standards• Implement and maintain unit, integration, and end-to-end tests• Collaborate with cross-functional teams including Product, Architecture, Security, and SRE• Support efforts to improve observability, automation, and operational efficiency across services• Continuously learn and apply new technologies, tools, and engineering practices
Technology Stack• Backend: C#, .NET, Web APIs• Cloud: Azure (App Services, KeyVault, Blob Storage), AWS (S3, Redis, Microservices)• Data: PostgreSQL, Flyway• Practices: CI/CD pipelines, observability, secure development• Plus: Java / Spring Boot, AI-assisted tools (e.g., GitHub Copilot)
What You Bring - Required• 2-4 years of professional software engineering experience• Experience developing backend applications and APIs using modern programming frameworks• Familiarity with cloud platforms and distributed systems concepts• Understanding of software development lifecycle (SDLC), testing practices, and secure coding principles• Ability to analyze and solve technical problems with guidance from senior engineers when needed• Experience delivering software components and features in a collaborative team environment• Strong communication and teamwork skills• Commitment to learning, continuous improvement, and engineering excellence
Preferred• Experience in payments, banking, or Open Banking (PSD2) environments• Exposure to microservices-based architectures• Familiarity with monitoring, observability, and production support practices• Experience using AI-assisted development tools (e.g., GitHub Copilot)
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.