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
- 1. Automation Ownership (API & UI)
- Design and maintain scalable, maintainable test automation frameworks using:
- o Java + Selenium (UI automation)
- o REST Assured (API automation)
- o Cucumber (BDD) for executable specifications
- o Cypress for modern UI testing where applicable
- Ensure automation suites are reliable, efficient, and aligned with engineering standards
- 2. API Quality Engineering
- Validate REST APIs built on Spring / Spring Boot for:
- o Functional correctness
- o Contract/schema adherence
- o Error handling and edge cases
- Utilize Postman and Insomnia for exploratory testing and debugging, converting findings into automated coverage
- 3. Performance & Non-Functional Testing
- Design and execute performance, load, and stress tests using tools such as JMeter and BlazeMeter
- Define and track performance baselines across:
- o Throughput
- o Latency
- o Resource utilization
- Partner with engineering teams to diagnose bottlenecks and optimize performance
- 4. CI/CD Integration
- Integrate automation suites into CI/CD pipelines to provide rapid feedback and enforce quality gates
- Enable parallel execution and efficient test runs across shared environments
- 5. Test Strategy & Quality Leadership
- Contribute 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:
- o Selenium (UI automation)
- o REST Assured (API testing)
- o Cucumber (BDD frameworks)
- o 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
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 12/29/2026. If the fill date has passed, Mastercard intends to fill this position as soon as possible.


Pay Ranges
O'Fallon, Missouri: $96,000 - $163,000 USD
