Senior Full-Stack QA Engineer, Poland

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

Description

Trivago Innovation Center is looking for an experienced, hands-on Senior Full-Stack QA Engineer to join our Polish team and ensure the quality of our B2C e-commerce platform.

You will take a comprehensive, end-to-end approach to testing across the frontend, backend, APIs, integrations, and data layers, helping us deliver reliable and seamless customer experiences.

This is an individual contributor role that works closely with Product and Engineering and reports to the Product Manager.

About the role

• Develop, document, and continuously improve QA processes and testing strategies across frontend, backend, API, and data layers.
• Plan, prioritize, and execute manual functional, regression, integration, and end-to-end tests for web and mobile products.
• Design and maintain detailed, well-structured test suites and test cases covering complete customer journeys and business-critical flows.
• Review product requirements, technical specifications, and user stories; provide timely feedback on testability, risks, and acceptance criteria.
• Test APIs and system integrations, validate data flows and backend responses, and investigate issues using relevant diagnostic tools.
• Use SQL to verify data accuracy, consistency, and business logic throughout the testing process.
• Identify, reproduce, document, report, and track defects; collaborate with developers to investigate root causes and verify fixes.
• Partner closely with Product and Engineering teams to define testing priorities, assess release readiness, and improve product quality.
• Contribute to test automation and the ongoing improvement of QA tools and methodologies, where relevant.

Requirements

• 5+ years of experience in software quality assurance, preferably testing e-commerce platforms, B2C products, or complex web applications.
• Strong hands-on experience with manual testing, including frontend, backend, integration, regression, and end-to-end testing.
• Practical experience with API testing and HTTP traffic analysis using tools such as Postman, Fiddler, and browser developer tools.
• Solid SQL knowledge and the ability to query and validate data; familiarity with scripting.
• Proven ability to write clear, accurate, and comprehensive test plans, test suites, and test cases.
• Experience working in an Agile/Scrum development environment.
• Strong analytical and troubleshooting skills, with the ability to independently investigate complex, cross-layer issues.
• Excellent communication and collaboration skills, with a hands-on and proactive approach.
• Hands-on experience with test automation tools or frameworks (e.g., Ghost Inspector, Selenium, Cypress) – an advantage.

Character and Attitude Figure

• A startup mindset and a roll-up-your-sleeves attitude.
• Adaptability and the ability to thrive in a fast-changing environment.
• Strong teamwork, accountability, and independent ownership.

About the Company

Trivago Innovation Center (formerly Holisto)

We’re part of trivago N.V., a global B2C travel-tech company headquartered in Düsseldorf, Germany. At trivago Innovation Center, we harness the power of award-winning AI and machine learning technologies to make hotel bookings smarter, more affordable, and perfectly tailored to each traveler.

Fuelled by our passion for travel and technology, we’ve spent years researching, developing, and refining solutions that help millions of users save money every single time they book.

More about us:

Originally posted on Himalayas