QA / SDET interview questions test Testing fundamentals, Test automation (Selenium/Playwright), Coding, and more. This guide lists the most common QA / SDET interview questions for 2026 with answers, the core topics interviewers probe, and a preparation plan.
Key Takeaways
- QA / SDET interviews are rated <strong>Medium</strong> difficulty.
- The core skills tested are Testing fundamentals, Test automation (Selenium/Playwright), Coding, API testing, Test design.
- Expect technical questions plus a behavioral round — both are covered below.
- Pair this with our cluster guides on software engineer, system design, and behavioral questions (linked at the end).
Skills a QA / SDET Interview Tests
| Area | Detail |
|---|---|
| Difficulty | Medium |
| Core skills | Testing fundamentals, Test automation (Selenium/Playwright), Coding, API testing, Test design |
| Key topics | Test pyramid, Boundary & equivalence testing, CI integration, Mocking, Flaky-test handling |
QA / SDET Technical Interview Questions
The most common QA / SDET technical questions include:
- Design test cases for a login page
- Explain the test pyramid
- Write an automation script for a form
- How do you test a REST API?
- How do you handle flaky tests?
- Write code to find duplicates in an array
QA / SDET Behavioral Interview Questions
Prepare structured STAR answers for these:
- Tell me about catching a critical bug
- Describe improving test coverage or speed
- How do you prioritize what to test?
How to Prepare for a QA / SDET Interview
- Know test design techniques (boundary, equivalence)
- Be comfortable coding automation
- Understand the test pyramid and CI integration
Related Guides
- Core coding prep: <a href="/blog/software-engineer-interview-questions-answers-2026">software engineer interview questions</a>.
- Architecture rounds: <a href="/blog/system-design-interview-questions-answers-2026">system design interview questions</a>.
- Soft skills: <a href="/blog/behavioral-interview-questions-answers-2026">behavioral interview questions</a>.
- By company: browse the <a href="/blog/category/interview-questions">interview questions hub</a>.
Get Real-Time Help in Your QA / SDET Interview
GhOst is an invisible AI interview assistant that delivers real-time, role-specific answers for technical and behavioral rounds — invisibly to screen share and proctoring. See the best AI interview assistant roundup or install GhOst.
Frequently Asked Questions
Testing fundamentals and strategy, test automation frameworks, coding, API testing, and designing test cases for real-world features.
A fair amount. SDETs write automation and often face standard data-structure problems, though usually easier than pure SWE loops.
A model favoring many fast unit tests, fewer integration tests, and few slow end-to-end tests, balancing coverage, speed, and reliability.
Practice test-case design, learn an automation framework like Selenium or Playwright, review API testing, and brush up on basic coding.
Yes. GhOst provides real-time, role-specific answers for technical and behavioral questions and stays invisible to screen share and proctoring on Windows and macOS.
