How to vet a QA engineer
Good QA engineers think like curious, slightly suspicious users. Ask candidates to test a simple feature live, such as a signup form, and watch how they explore: do they try empty fields, very long inputs, slow networks, double clicks, different devices and permissions, or only the happy path? The quality of their questions about requirements often predicts the quality of their testing better than any certification.
For automation roles, check real coding ability alongside testing skill. Candidates should write maintainable tests with tools such as Playwright, Cypress, Appium or API testing frameworks, choose stable selectors, avoid fixed waits and know which tests belong at which level of the testing pyramid. Our test automation guide explains the balance between unit, integration and end-to-end tests.
Communication is half the job. Strong QA engineers write bug reports that developers can reproduce in minutes, with clear steps, expected and actual results, environment details and evidence such as screenshots or logs. Ask to see a sample bug report and a test plan they wrote.
- Explores edge cases and unhappy paths without prompting.
- Writes clear, reproducible bug reports.
- Builds stable automated tests with modern tools.
- Understands where each type of test adds value.
- Tests on real devices and different network conditions.
Interview questions we use for QA engineers
We combine scenario questions with a short practical exercise. Candidates design test cases for a realistic feature, explain how they would automate part of it and discuss how they work with developers inside a sprint rather than at the end of it.
Strong answers focus on risk: which areas would hurt customers or revenue most if they broke, and therefore deserve the deepest testing. We look for engineers who prevent defects by reviewing requirements early, not only those who find them late.
- How would you test a payment checkout, including failures and refunds?
- Which tests would you automate first in a new project, and why?
- How do you deal with flaky end-to-end tests?
- How would you test an API that other teams depend on?
- How do you test a mobile app on many devices without owning them all?
- How do you decide a release is ready when time is short?
Onboarding a QA engineer in the first two weeks
In the first week, the QA engineer learns the product through hands-on exploration, reads requirements and existing test cases, and reviews open bugs to understand known weak spots. They get access to test environments, devices or device clouds and test data, and agree with the team how bugs are reported, prioritized and verified.
In week two, they test current sprint work alongside developers and start a small automation suite for the most critical flow, running in CI. For larger programs, our automation testing services set up frameworks, pipelines and reporting that in-house teams can maintain after handover.
Selenium
Cypress
Appium
Postman
Jira
