Senior Software Engineer, .NET

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, .NET

Overview:

The Foundational Services teams aim to provide common, high-performance, and easy-to-use solutions for cross-cutting concerns. We work closely with market-facing product engineering teams to help them take maximum advantage of these capabilities and to evolve our core platform to meet their needs and the needs of our customers.

We are looking for a Senior Software Engineer excited to engage deeply with the core technologies we use, design and implement robust and secure "common code", and create a great development experience for other engineers through libraries, APIs, and tooling. As a member of our team, you would apply your skills to provide reusable solutions for all development teams in domains like authentication, caching, serving static assets, logging, error handling, build tooling, unit and integration testing, and scheduling asynchronous work.

Last month, the Foundational Services teams made impressive progress in enhancing platform performance and security. They developed, tested, and rolled out performance improvements to better handle load in the job scheduling engine, and improved content security policy headers to address potential vulnerabilities. Additionally, they contributed to the proposal and planning for implementing Message Queue using Kafka, designed and wrote health checks for critical services, and provided support to other development teams by answering questions and pair programming with them on core APIs and NuGet packages.

Responsibilities include the following:


• Collaborate with engineers to develop and maintain high-volume, high-performance .NET applications.
• Work with technical leads and product managers to define features and write user stories that align with project requirements.
• Lead day-to-day system development and maintenance efforts, ensuring alignment with SLAs.
• Seek opportunities to enhance standards and streamline processes, improving team efficiency.
• Troubleshoot and resolve complex technical issues in both the development and production environments.
• Contribute to the entire software development lifecycle, including planning, coding, testing, deploying, and supporting applications.
• Apply best practices in software engineering, ensuring clean, efficient, and maintainable code using object-oriented programming (OOP) principles and modern frameworks.
• Mentor junior engineers and contribute to team knowledge-sharing, fostering a culture of continuous improvement.

All About You:

• Proven full-stack development experience with expertise in back-end development.
• Proven expertise in .NET development using frameworks such as EF, etc. or Java with Spring framework.
• Strong background in RESTful APIs and JSON/SOAP-based APIs.
• Excellent knowledge of software engineering concepts and methodologies.
• Experience building global-scale, high-quality solutions.
• Strong verbal and written communication skills, with the ability to convey complex information to both technical and non-technical stakeholders.
• Proactive problem-solver with a focus on identifying solutions and driving them to implementation.
• Experience having worked with and designed "common code" and/or developer tools
• Experience having worked on system design problems


Had you been with us last month, you would have:

Contributed to the development, testing, and rollout of performance improvements to better handle load in our job scheduling engine.
Improved our content security policy headers to more effectively address potential vulnerabilities.
Contributed to the proposal and planning for implementing Message Queue using Kafka in the platform.
Designed and written health checks for critical services to ensure they are properly configured and initialized before going live.
Answered questions from and pair programmed with other development teams who use our core APIs and NuGet packages.

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Mastercard is a merit-based, inclusive, equal opportunity employer that considers applicants without regard to gender, gender identity, sexual orientation, race, ethnicity, disabled or veteran status, or any other characteristic protected by l