Senior Software Engineer – Integrations & API Connectivity
Core
Design, build, and operate scalable backend services and APIs for financial institution integrations within Mastercard's Open Finance Europe team.
Role type
Senior IC backend software engineer (APIs & integrations)
Builds
Scalable API integrations and backend services for financial institutions
Domain
Fintech / Open Banking / Payments
Deliverable
production ML models | product features
Required skills
C#, .NET, Web APIs, cloud-based distributed systems, API development, scalability, production support, SDLC, testing practices, secure coding
Preferred skills
payments/banking/Open Banking (PSD2), microservices architectures, observability, monitoring, incident response, AI-assisted development tools
Technologies
C#, .NET, Azure, AWS, PostgreSQL, Flyway, Java, Spring Boot, GitHub Copilot
Responsibilities
Design and develop scalable APIs and backend services; Contribute to system design decisions; Troubleshoot and resolve production issues; Implement effective testing strategies; Collaborate with cross-functional teams; Improve observability and operational efficiency
Seniority
Senior, hands-on IC