Senior Software Engineer – Integrations & API Connectivity

Senior Software Engineer – Integrations & API Connectivity at Mastercard scores 25 out of 100 on AI centrality, which makes it a Level 1 role on this board.

Navi Mumbai, India (Finicity)seniorFull time

AI in this role

Senior software engineer building scalable backend services and APIs with occasional use of AI coding assistants.

copilotc-sharpnetazureawspostgresqljavagithub-copilot

api-developmentbackendsystem-designci-cdobservability

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

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
• Strong collaboration and communication skills

Preferred
• Experience in payments, banking, or Open Banking (PSD2) environments
• Experience working with microservices architectures
• Familiarity with observability, monitoring, and incident response practices
• Exposure to 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.

Prepare for this job

A free preview built only from this posting: what it asks for, what you could be asked in an interview, and how to adjust your resume.

Skills and AI tools this role asks for

Api DevelopmentBackendSystem DesignCi CdObservabilityCopilotC SharpNet

Questions you could be asked

Tell me about a project where api development was part of your work. What did you do?
Tell me about a project where backend was part of your work. What did you do?
Tell me about a project where system design was part of your work. What did you do?
Tell me about a project where ci cd was part of your work. What did you do?
Tell me about a project where observability was part of your work. What did you do?

Adapt your resume

List these exact terms on your resume: Api Development, Backend, System Design, Ci Cd, and Observability. An applicant tracking system matches the wording, not the idea.
Attach one line of real, concrete experience to at least one of them — a tool named with nothing behind it rarely survives a human read.

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