Senior Software Engineer

Location: O'Fallon, Missouri

Time Type: Full time

Job Description

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

Overview
Next Edge represents the next phase of Mastercard's Core Payments technology transformation and plays a key role in advancing our cloud-first strategy. This organization is focused on modernizing payment platforms, creating scalable engineering solutions, and delivering the tools and services that enable teams to build, test, and deploy software more efficiently.

As a Senior Software Engineer, you will contribute to the design and development of internal platforms, backend services, and engineering tools that improve developer productivity and accelerate delivery across Mastercard's payment ecosystem. Working closely with engineers, product managers, designers, and technical leads, you will help build reliable, scalable solutions while driving continuous improvements in software quality, performance, and maintainability.

This role is ideal for an engineer who enjoys solving complex technical challenges, building modern distributed systems, and working with evolving technologies that support innovation at enterprise scale.

Role
-Design, develop, and support internal platforms, microservices, and engineering tools that improve productivity and accelerate software delivery.
-Partner with technical leads and team members to scope, design, and implement complex features from concept through production deployment.
-Build high-quality, maintainable code and automated tests that contribute to reliable and efficient software delivery.
-Develop backend services and supporting tools using technologies such as Golang, Java, and gRPC.
-Contribute to software architecture and design decisions that improve scalability, resiliency, maintainability, and operational readiness.
-Collaborate with Product Managers and Customer Experience Designers to understand user needs and translate requirements into technical solutions.
-Review code, share feedback, and promote engineering practices that enhance quality, readability, security, and long-term maintainability.
-Analyze system behavior, troubleshoot complex issues, identify root causes, and implement sustainable solutions.
-Improve application performance, reliability, and observability across services and platforms.
-Contribute to automation initiatives, development workflows, and engineering practices that increase team effectiveness and delivery speed.
-Support and guide less experienced engineers through knowledge sharing, technical discussions, and collaborative problem solving.
-Stay current with emerging technologies and evaluate opportunities to apply them where they create measurable value.

All About You
-Strong proficiency in Golang, Java, or comparable object-oriented programming languages.
-Ability to design and implement complex features within large-scale applications and distributed systems.
-Familiarity with microservices architecture, service-to-service communication patterns, and API development.
-Understanding of software design principles and architectural patterns that support scalable, resilient applications.
-Capability to write clean, maintainable code while balancing performance, reliability, and long-term sustainability.
-Proven success contributing to large engineering initiatives involving multiple teams and stakeholders.
-Strong foundation in data structures, algorithms, and problem-solving techniques.
-Ability to evaluate and optimize application performance in high-volume, transaction-oriented environments.
-Commitment to automated testing, code quality, and continuous improvement throughout the software development lifecycle.
-Familiarity with secure coding practices and modern software engineering standards.
-Strong troubleshooting skills with the ability to diagnose and resolve issues across complex systems.
-Comfortable working within Agile environments and collaborating with -geographically distributed teams.
-Customer-focused mindset with an appreciation for how technical decisions influence user outcomes.
-Curiosity and willingness to learn new technologies, frameworks, and development approaches.
-Effective communication skills with the ability to collaborate across engineering, product, and design teams.
-Degree in Computer Science, Engineering, or a related technical discipline, or equivalent practical background.
-AI-first mindset with the ability to leverage tools such as GitHub Copilot, Claude Code, ChatGPT, and similar technologies to improve productivity, code quality, and delivery outcomes.

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 law. We hire the most qualified candidate for the role. In the US or Canada, if you require accommodations or assistance to complete the online application process or during the recruitment process, please contact reasonable_accommodation@mastercard.com and identify the type of accommodation or assistance you are requesting. Do not include any medical or health information in this email. The Reasonable Accommodations team will respond to your email promptly.

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.

In line with Mastercard’s total compensation philosophy and assuming that the job will be performed in the US, the successful candidate will be offered a competitive base salary and may be eligible for an annual bonus or commissions depending on the role. The base salary offered may vary depending on multiple factors, including but not limited to location, job-related knowledge, skills, and experience. Mastercard benefits for full time (and certain part time) employees generally include: insurance (including medical, prescription drug, dental, vision, disability, life insurance); flexible spending account and health savings account; paid leaves (including 16 weeks of new parent leave and up to 20 days of bereavement leave); 80 hours of Paid Sick and Safe Time, 25 days of vacation time and 5 personal days, pro-rated based on date of hire; 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; and many more. Mastercard benefits for interns generally include: 56 hours of Paid Sick and Safe Time; jury duty leave; and on-site fitness facilities in some locations.

Pay Ranges

O'Fallon, Missouri: $115,000 - $184,000 USD