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 – 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 Senior Software Engineer, you will be a key hands-on contributor responsible for designing, building, and operating secure, reliable backend services. You will work on complex engineering problems, contribute to system design decisions, and deliver high-quality solutions that operate at scale in production environments.
- Role-What You’ll Do
- Design, develop, test, and support scalable APIs and backend services
- Contribute to system design decisions with a focus on scalability, resilience, and performance
- Deliver high-quality, production-ready code across the full software development lifecycle
- Troubleshoot and resolve production issues, ensuring system stability and reliability
- Participate in code reviews and uphold engineering best practices and standards
- Implement effective testing strategies (unit, integration, end-to-end)
- Collaborate with cross-functional teams including Product, Architecture, Security, and SRE
- Improve observability, automation, and operational efficiency across services
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- 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)
- All about you-What You Bring - Required
- 3-5 years of professional software engineering experience
- Strong hands-on experience building cloud-based, distributed backend systems
- Solid expertise in API development, scalability, and production support
- Ability to solve complex technical problems with a structured, pragmatic approach
- Strong understanding of SDLC, testing practices, and secure coding principles
- Proven ability to own and deliver components/services independently
