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
The Business & Market Insights team within Mastercard's Services organization develops products and platforms that help customers understand consumer behavior, market trends, and business performance. Through data-driven insights, the team enables organizations to make informed decisions and drive growth.

As a Senior Software Engineer, you will design, build, test, deploy, and support full-stack solutions that power these capabilities. Working across the frontend, backend, data, and cloud ecosystem, you will contribute to modern, reliable platforms while helping advance technical excellence and operational maturity.

What You'll Do
Software Development
•Design, develop, test, and support full-stack applications, APIs, and services.
•Translate business and technical requirements into maintainable solutions.
•Build REST APIs, microservices, and user-facing functionality.
•Write high-quality code that aligns with Mastercard engineering standards.

Design & Architecture
•Participate in application design and architectural discussions.
•Contribute to cloud-based, resilient solution designs.
•Support modernization efforts and technology enhancements.

Quality & Operational Excellence
•Create and maintain automated unit, integration, and API tests.
•Participate in code reviews to strengthen quality and maintainability.
•Troubleshoot production issues, perform root cause analysis, and optimize performance.
•Support observability, monitoring, CI/CD pipelines, and operational readiness.

Collaboration
•Partner with Product, Architecture, UX, Security, and Engineering teams to deliver business value.
•Participate in Agile ceremonies, technical planning, and knowledge-sharing activities.
•Promote engineering standards and continuous improvement.

Required Qualifications
•Bachelor's degree in Computer Science, Engineering, Information Technology, or a related field, or equivalent practical experience.
•Agentic AI Development and Spec-Driven Development experience.
•Experience building enterprise solutions using Java and Spring Boot.
•Experience developing REST APIs, microservices, and distributed systems.
•Working knowledge of React, JavaScript/TypeScript, HTML, and CSS.
•Experience with cloud platforms, relational databases, and CI/CD pipelines.
•Strong troubleshooting, debugging, and analytical skills.
•Ability to deliver technical solutions independently while collaborating effectively within a team environment.

Preferred Qualifications
•Experience with API management solutions such as Apigee, MuleSoft, Kong, or similar platforms.
•Knowledge of AWS cloud services and cloud-native application design.
•Familiarity with Kafka and event-driven architectures.
•Experience with containerization, orchestration, and Infrastructure as Code tools, including Docker, Kubernetes, and Terraform.
•Exposure to observability, monitoring, and performance management tools such as Splunk, Dynatrace, Grafana, or Prometheus.

Success Measures (First 12 Months)
•A successful Senior Software Engineer will:
•Deliver features from design through production deployment.
•Build reliable, high-performing applications and services.
•Enhance maintainability, performance, and operational efficiency.
•Demonstrate ownership of key systems or technical domains.
•Contribute to quality, automation, and engineering excellence.

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. THIS POSTING RELECTS ONE OR MORE CURRENT VACANCIES ON OUR TEAM, AND MASTERCARD INTENDS TO FILL THIS POSITION BY 01/11/2027. If the fill date has passed, Mastercard intends to fill this position as soon as possible.

Pay Ranges

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