Senior Software Engineer, .NET

About the position

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. 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.

Responsibilities

• 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.

Requirements

• 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.

Benefits

• Insurance (including medical, prescription drug, dental, vision, disability, life insurance)
• Flexible spending account and health savings account
• Paid leaves (including 16 weeks new parent leave, up to 20 paid days bereavement leave)
• 10 annual paid sick days
• 10 or more annual paid vacation days based on level
• 5 personal days
• 10 annual paid U.S. observed holidays
• 401k with a best-in-class company match
• Deferred compensation for eligible roles
• Fitness reimbursement or on-site fitness facilities
• Eligibility for tuition reimbursement
• Gender-inclusive benefits
• Many more