About this opportunity
Mastercard Inc. lists this Senior Integration Engineer opportunity in o’fallon, Missouri. Review the employer’s description below for duties, qualifications and application requirements.
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 Integration Engineer Overview
At Mastercard, our technology and innovation are driven by a clear purpose: to build a sustainable, inclusive global economy. Our commitment to being a force for good is embedded in The Mastercard Way—the principles and behaviors that define who we are and how we deliver value to our customers, partners, and communities. We foster a highly collaborative and inclusive environment where employees are empowered to bring their full, authentic selves to work. By leveraging the diverse strengths, perspectives, and experiences of our global workforce, we continue to drive innovation at scale.
Role Summary
The Pricing & Billing Resource Center (PBRC) team develops and operates business-critical, API-driven platforms built on Java and Spring technologies. These platforms power highly scalable and reliable billing and pricing services across Mastercard. Quality engineering is central to ensuring functional correctness, API integrity, UI reliability, and performance at scale. This role is an automation-first Senior SDET position, responsible for designing, building, and maintaining robust automated test frameworks across API, UI, and performance layers. You will work closely with engineering teams to embed quality throughout the SDLC, ensuring speed, stability, and confidence in every release.
Key Responsibilities
Automation Ownership (API & UI)Design and maintain scalable, maintainable test automation frameworks using:
Java + Selenium (UI automation)
REST Assured (API automation)
Cucumber (BDD) for executable specifications
Cypress for modern UI testing where applicable
Ensure automation suites are reliable, efficient, and aligned with engineering standards
API Quality EngineeringValidate REST APIs built on Spring / Spring Boot for functional correctness
Contract/schema adherence
Error handling and edge cases
Utilize Postman and Insomnia for exploratory testing and debugging, converting findings into automated coverage
Performance & Non-Functional TestingDesign and execute performance, load, and stress tests using tools such as JMeter and BlazeMeter
Define and track performance baselines across throughput, latency, Resource utilization
Partner with engineering teams to diagnose bottlenecks and optimize performance
CI/CD IntegrationIntegrate automation suites into CI/CD pipelines to provide rapid feedback and enforce quality gates
Enable parallel execution and efficient test runs across shared environments
Test Strategy & Quality LeadershipContribute to test strategy, coverage planning, and risk assessment
Create high-quality defect reports with clear diagnostics and reproducibility
Lead improvements in test frameworks, processes, and engineering standards
Provide technical leadership and mentorship across QA and delivery teams
Required Qualifications
6+ years of experience in automation-focused QA / SDET roles
Strong hands-on expertise in Java-based automation frameworks
Deep experience with Selenium (UI automation)
Deep experience with REST Assured (API testing)
Deep experience with Cucumber (BDD frameworks)
Deep experience with Cypress (modern UI automation)
Strong understanding of Spring / Spring Boot microservices architectures
Experience testing RESTful APIs in distributed systems environments
Hands-on experience with performance testing tools (JMeter, BlazeMeter)
Solid understanding of CI/CD pipelines and automated test execution
Strong analytical, debugging, and problem‑solving skills
Preferred Qualifications
Experience designing or evolving automation frameworks (beyond test case development)
Familiarity with test design patterns (Page Object Model, abstraction layers, BDD best practices)
Experience supporting high-scale, mission-critical systems with strict SLAs
Experience in Agile/Scrum delivery models
Exposure to containerized or cloud-based testing environments
Familiarity with test management tools (e.g., Jira, ALM)
Domain experience in billing, financial systems, payments, or card services
Experience testing data pipelines, ETL processes, or streaming systems
Equal Opportunity
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.
Accommodations
In the US or Canada, if you require accommodations or assistance to complete the online application process or during the recruitment process, please contact 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.
Compensation Philosophy
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.
Benefits for Full Time Employees
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
Many more
Benefits for Interns
56 hours of Paid Sick and Safe Time
Jury duty leave
On‑site fitness facilities in some locations
Posting Notice
THIS POSTING RELECTS ONE OR MORE CURRENT VACANCIES ON OUR TEAM, AND MASTERCARD INTENDS TO FILL THIS POSITION BY 12/29/2026.
Pay Ranges
O'Fallon, Missouri: $96,000 - $163,000 USD
Marketing
Everyone wants easier ways to pay; we invent them. Checkout lines are slow; we speed them along. Merchants want more sales; we give them data and insights. People need financial access; we connect them. Corporate purchasing is complicated; we make it simple. Commuters are busy; we speed them on their way. Governments need greater efficiencies; we help create them. Small businesses are virtual; we give them access to a world of buyers. Retailers want to fight fraud; we provide the tools.
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Who can apply
Review the original listing for work authorization, qualifications and employer requirements.