Senior Full-Stack QA Engineer – E‑Commerce & API Testing

HOLISTO; United States; Remote; USD 110,000 - 150,000; Full time

Job summary

Trivago Innovation Center (formerly Holisto) in the United States seeks a Senior Full-Stack QA Engineer to own end-to-end quality across frontend, backend, APIs and data layers for our B2C e-commerce platform.

You will design test plans, execute manual and automated tests, verify data with SQL, and collaborate with Product and Engineering to improve release readiness and overall product quality. This is an individual contributor role reporting to the Product Manager.

Qualifications

• 5+ years in software quality assurance for e-commerce/B2C or complex web apps.
• Hands-on manual testing across frontend, backend, integrations, and data layers.
• API testing and HTTP traffic analysis with tools like Postman, Fiddler, browser dev tools.
• Solid SQL knowledge; ability to query and validate data; scripting familiarity.

Responsibilities

• Develop, document, and improve QA processes and testing strategies across frontend, backend, API, and data layers.
• Plan, prioritize, and execute functional, regression, integration, and end-to-end tests for web and mobile products.
• Design and maintain test suites and cases covering complete customer journeys and critical flows.
• Review requirements and user stories; provide feedback on testability, risks, and acceptance criteria.
• Test APIs and system integrations; verify data flows and backend responses; investigate defects and reproduce issues.

Skills

Manual testing

API testing

SQL

Agile/Scrum

Test planning

Troubleshooting

Tools

Ghost Inspector

Selenium

Cypress

Postman

Fiddler

Job description

Trivago Innovation Center (formerly Holisto) in the United States seeks a Senior Full-Stack QA Engineer to own end-to-end quality across frontend, backend, APIs and data layers for our B2C e-commerce platform.

You will design test plans, execute manual and automated tests, verify data with SQL, and collaborate with Product and Engineering to improve release readiness and overall product quality. This is an individual contributor role reporting to the Product Manager.