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Mock SDET Interview: Junior QA Engineer
Mock SDET Interview: Junior QA Engineer
Preparing for your first SDET interview?
For many junior QA engineers, interviews can feel overwhelming. It’s not only about solving technical questions — you also need to show critical thinking, problem-solving skills, and the ability to work in a fast-paced tech environment.
This guide will walk you through the most common Junior QA / SDET interview questions and how to answer them effectively.
For many junior QA engineers, interviews can feel overwhelming. It’s not only about solving technical questions — you also need to show critical thinking, problem-solving skills, and the ability to work in a fast-paced tech environment.
This guide will walk you through the most common Junior QA / SDET interview questions and how to answer them effectively.
Key Takeaways
- The most frequent Junior SDET interview questions.
- How to structure strong answers that interviewers expect.
- Examples of both technical and behavioral questions.
- Practical tips to feel confident during your first interview.
What Is a Mock SDET Interview?
A mock interview is a simulated job interview designed to help you practice and improve before the real thing.
These sessions allow you to:
These sessions allow you to:
- Experience a realistic interview environment.
- Receive feedback on your answers, communication, and technical approach.
- Build the confidence to perform under pressure.
Junior SDET Interview Questions and Answers
1. Tell me about yourself.
Use the Present → Past → Future structure.
Example:
“I recently finished a QA Bootcamp where I practiced automation in JavaScript and Playwright. Before that, I worked in logistics, which gave me strong problem-solving skills. Now I’m looking for a Junior SDET role where I can apply automation and grow further in testing.”
2. What is the difference between QA, QC, and Testing?
Example:
“QA builds the right process, QC ensures the product meets standards, and testing is the execution of checks.
Together, they ensure product quality.”
Use the Present → Past → Future structure.
Example:
“I recently finished a QA Bootcamp where I practiced automation in JavaScript and Playwright. Before that, I worked in logistics, which gave me strong problem-solving skills. Now I’m looking for a Junior SDET role where I can apply automation and grow further in testing.”
2. What is the difference between QA, QC, and Testing?
- QA (Quality Assurance): Process-oriented, prevents defects.
- QC (Quality Control): Product-focused, validates the result.
- Testing: The actual activity of finding and reporting bugs.
Example:
“QA builds the right process, QC ensures the product meets standards, and testing is the execution of checks.
Together, they ensure product quality.”
3. Write a basic test case for a login page.
Show structured thinking.
Example:
Test Case: Login with valid credentials
Precondition: User account exists.
Steps:
Show structured thinking.
Example:
Test Case: Login with valid credentials
Precondition: User account exists.
Steps:
- Open login page.
- Enter valid email and password.
- Click “Login.”
4. Write a short program to reverse a string.
Example (JavaScript):
Example (JavaScript):
function reverseString(str) {
return str.split('').reverse().join('');
}
console.log(reverseString("Interview")); // weivretnI
Always explain your thought process, not just the code.
5. How do you test an API?
“I usually start with Postman, validating both positive and negative cases, then move to automation using RestAssured or Playwright API testing.”
6. What’s the difference between Selenium, Cypress, and Playwright?
“I prefer Playwright for modern projects because of speed and CI/CD integration. But I also understand Selenium’s role in legacy systems.”
7. How do you handle conflicts with developers?
Show teamwork and professionalism.
Example:
“If a developer questions my bug report, I provide clear reproduction steps, logs, and explain the impact. My goal is collaboration, not confrontation.”
- Check status codes (200, 400, 500).
- Validate response body (fields, data types).
- Verify headers (auth, content type).
- Cover negative scenarios (invalid input, missing fields).
“I usually start with Postman, validating both positive and negative cases, then move to automation using RestAssured or Playwright API testing.”
6. What’s the difference between Selenium, Cypress, and Playwright?
- Selenium: Old, widely used, supports many languages, slower.
- Cypress: Modern, JavaScript-only, fast, but limited browser support.
- Playwright: New, multi-language, multi-browser, supports UI and API testing.
“I prefer Playwright for modern projects because of speed and CI/CD integration. But I also understand Selenium’s role in legacy systems.”
7. How do you handle conflicts with developers?
Show teamwork and professionalism.
Example:
“If a developer questions my bug report, I provide clear reproduction steps, logs, and explain the impact. My goal is collaboration, not confrontation.”
Why Mock Interviews Matter
You practice in a low-risk environment.
You receive actionable feedback.
You enter real interviews more confident and prepared.
You receive actionable feedback.
You enter real interviews more confident and prepared.
FAQ
Q1: How should I prepare for a Junior SDET interview?
Want to see this article in video format and more questions?
Click here and watch the video version on YouTube — and don’t forget to subscribe so you never miss new QA stories!
Or if you’re serious about breaking into tech:
Apply to the Codemify Bootcamp — and start building your future now.
Let’s make tech simple — and profitable — for you.
See you in class,
— Sergii
Founder of Codemify
Follow us on YouTube | Join the Bootcamp
- Review QA basics, practice coding daily, and rehearse with mock interviews.
- Java, Python, and JavaScript are the most popular choices.
- Yes. Most interviews expect at least a basic understanding of automation tools.
- Very. Clear communication and teamwork are equally important as technical skills.
Want to see this article in video format and more questions?
Click here and watch the video version on YouTube — and don’t forget to subscribe so you never miss new QA stories!
Or if you’re serious about breaking into tech:
Apply to the Codemify Bootcamp — and start building your future now.
Let’s make tech simple — and profitable — for you.
See you in class,
— Sergii
Founder of Codemify
Follow us on YouTube | Join the Bootcamp
Schedule a FREE 15-minute consultation with Sergii to discuss your testing career and job opportunities.
Limited slots are available!
Limited slots are available!
We help ambitious people to get into Tech with no prior experience.