Senior Software Engineer – Integrations & API Connectivity

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Skills you'll use

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
• Technology Stack
• Backend: C#, .NET, Web APIs

Who can apply

• 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
• Strong collaboration and communication skills

About Mastercard

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