Senior Automation Engineer - API/UI & Performance

Mastercard Inc.; O’Fallon (MO); On-site; USD 96,000 - 163,000; Full time

Benefits offered by this job

Insurance (medical)

401k

Paid leaves

Health savings account

On-site fitness facilities

Job summary

Mastercard is hiring a Senior Integration Engineer in the US, focused on automation-first QA across API, UI, and performance layers. You will design robust test frameworks using Java, Selenium, REST Assured, and Cypress, and drive quality throughout the SDLC.

Strong collaboration with engineering teams and mentorship across QA are expected. The role emphasizes scalable automation, API quality, and performance testing in a high-stakes payments environment in Missouri.

Qualifications

• 6+ years in automation-focused QA / SDET roles.
• Hands-on Java-based automation frameworks and UI/API testing.
• Experience with Selenium, REST Assured, Cucumber, Cypress.
• Strong knowledge of Spring / Spring Boot microservices.
• Performance testing with JMeter or BlazeMeter and CI/CD.

Responsibilities

• Automation Ownership (API & UI): design and maintain scalable test frameworks.
• API Quality Engineering: validate REST APIs and contract/schema adherence.
• Performance & Non-Functional Testing: run load/stress tests and identify bottlenecks.
• CI/CD Integration: embed automation in pipelines for rapid feedback.
• Test Strategy & Leadership: contribute to coverage, reporting, and mentoring.

Skills

Automation QA

Java automation

Selenium UI

REST Assured

Cucumber

Cypress

Spring Boot

API testing

Performance testing

CI/CD pipelines

Debugging & Problem solving

Tools

Postman

Insomnia

JMeter

BlazeMeter

Job description

Mastercard is hiring a Senior Integration Engineer in the US, focused on automation-first QA across API, UI, and performance layers. You will design robust test frameworks using Java, Selenium, REST Assured, and Cypress, and drive quality throughout the SDLC.

Strong collaboration with engineering teams and mentorship across QA are expected. The role emphasizes scalable automation, API quality, and performance testing in a high-stakes payments environment in Missouri.