sdet-interview-prep

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sdet-interview-prep

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1500+ SDET, QA Automation & Software Testing Interview Questions with detailed answers, code examples, and real interview tips. Covering Java, Selenium, Playwright, Cypress, Appium, TestNG, Cucumber, REST Assured, SQL, Docker, K8s, DSA, and more.

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- - deploy-docs.yml
- cheatsheet.md
- collections-framework.md
- java8-features.md
- multithreading.md
- oops-concepts.md
- README.md
- cheatsheet.md
- README.md
- typescript-for-testing.md
- advanced-selenium.md
- cheatsheet.md
- page-object-model.md
- README.md
- advanced-playwright.md
- cheatsheet.md
- README.md
- advanced-cypress.md
- cheatsheet.md
- README.md
- advanced-appium.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- advanced-topics.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- cheatsheet.md
- README.md
- array-problems.md
- cheatsheet.md
- dp-problems.md
- linked-list-problems.md
- README.md
- string-problems.md
- tree-graph-problems.md
- cheatsheet.md
- README.md
- star-method.md
- README.md
- real-interview-experiences.md
- interview-preparation-checklist.md
- interview-tips.md
- master-cheatsheet.md
- mock-interview-scenarios.md
- real-interview-experiences.md
- recommended-reading.md
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mkdocs.yml
README.md

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A comprehensive collection of 1500+ real-world SDET, QA Automation, and Software Testing interview questions with detailed answers, code examples, and interview tips.

---

## 📋 About This Repository

This repository is designed for **QA Engineers, Automation Testers, SDETs, Senior SDETs, Test Leads, and Test Architects** with **5–15+ years** of experience preparing for interviews at product companies, startups, and enterprise organizations.

Every question includes:
- ✅ **Full detailed answers** with real-world context
- ✅ **Code examples** in Java, JavaScript/TypeScript, SQL, and more
- ✅ **Key points** for quick understanding
- ✅ **Real interview tips** from actual SDET interviews
- ✅ **Follow-up questions** to anticipate interviewer depth

---

## 📚 Topics Covered

### 🔤 Programming Languages & Foundations

| # | Topic | Questions | Quick Links |
|---|-------|-----------|-------------|
| 01 | **Java (Core, OOPs, Collections, Multithreading, Java 8+)** | ~250 | [Core Java](01-java-core/README.md) · [OOPs](01-java-core/oops-concepts.md) · [Collections](01-java-core/collections-framework.md) · [Multithreading](01-java-core/multithreading.md) · [Java 8](01-java-core/java8-features.md) · [Cheatsheet](01-java-core/cheatsheet.md) |
| 02 | **JavaScript / TypeScript for Automation** | ~80 | [JS/TS Fundamentals](02-javascript-typescript/README.md) · [TypeScript Deep Dive](02-javascript-typescript/typescript-for-testing.md) · [Cheatsheet](02-javascript-typescript/cheatsheet.md) |

### 🌐 UI Automation Frameworks

| # | Topic | Questions | Quick Links |
|---|-------|-----------|-------------|
| 03 | **Selenium WebDriver** | ~160 | [Core Selenium](03-selenium-webdriver/README.md) · [Advanced](03-selenium-webdriver/advanced-selenium.md) · [POM & Page Factory](03-selenium-webdriver/page-object-model.md) · [Cheatsheet](03-selenium-webdriver/cheatsheet.md) |
| 04 | **Playwright** | ~100 | [Fundamentals](04-playwright/README.md) · [Advanced Topics](04-playwright/advanced-playwright.md) · [Cheatsheet](04-playwright/cheatsheet.md) |
| 05 | **Cypress** | ~80 | [Fundamentals](05-cypress/README.md) · [Advanced](05-cypress/advanced-cypress.md) · [Cheatsheet](05-cypress/cheatsheet.md) |
| 06 | **Appium & Mobile Testing** | ~80 | [Appium Fundamentals](06-appium-mobile-testing/README.md) · [Advanced](06-appium-mobile-testing/advanced-appium.md) · [Cheatsheet](06-appium-mobile-testing/cheatsheet.md) |

### 🧪 Test Frameworks & BDD

| # | Topic | Questions | Quick Links |
|---|-------|-----------|-------------|
| 07 | **TestNG** | ~60 | [TestNG Framework](07-testng/README.md) · [Cheatsheet](07-testng/cheatsheet.md) |
| 08 | **Cucumber BDD** | ~50 | [Cucumber & Gherkin](08-cucumber-bdd/README.md) · [Cheatsheet](08-cucumber-bdd/cheatsheet.md) |

### 🔌 API Testing

| # | Topic | Questions | Quick Links |
|---|-------|-----------|-------------|
| 09 | **API Testing Fundamentals** | ~50 | [HTTP, REST, SOAP, GraphQL](09-api-testing-fundamentals/README.md) · [Cheatsheet](09-api-testing-fundamentals/cheatsheet.md) |
| 10 | **REST Assured** | ~90 | [Core REST Assured](10-rest-assured/README.md) · [Advanced Topics](10-rest-assured/advanced-topics.md) · [Cheatsheet](10-rest-assured/cheatsheet.md) |
| 11 | **Postman** | ~40 | [Postman API Testing](11-postman/README.md) · [Cheatsheet](11-postman/cheatsheet.md) |

### 🗄️ Database

| # | Topic | Questions | Quick Links |
|---|-------|-----------|-------------|
| 12 | **SQL & Database Testing** | ~60 | [SQL & DB Testing](12-sql-database-testing/README.md) · [Cheatsheet](12-sql-database-testing/cheatsheet.md) |

### ⚙️ DevOps & CI/CD

| # | Topic | Questions | Quick Links |
|---|-------|-----------|-------------|
| 13 | **Git & Version Control** | ~40 | [Git Fundamentals](13-git-version-control/README.md) · [Cheatsheet](13-git-version-control/cheatsheet.md) |
| 14 | **Maven & Jenkins** | ~40 | [Maven & Jenkins](14-maven-jenkins/README.md) · [Cheatsheet](14-maven-jenkins/cheatsheet.md) |
| 15 | **CI/CD Concepts** | ~30 | [CI/CD Pipelines](15-cicd/README.md) · [Cheatsheet](15-cicd/cheatsheet.md) |
| 16 | **Docker, Kubernetes & AWS** | ~40 | [Docker/K8s/AWS for QA](16-docker-k8s-aws/README.md) · [Cheatsheet](16-docker-k8s-aws/cheatsheet.md) |

### 📊 Processes & Specialized Testing

| # | Topic | Questions | Quick Links |
|---|-------|-----------|-------------|
| 17 | **Agile, Scrum & QA Processes** | ~40 | [Agile & Scrum](17-agile-scrum/README.md) · [Cheatsheet](17-agile-scrum/cheatsheet.md) |
| 18 | **Performance Testing (JMeter)** | ~40 | [JMeter & Perf Testing](18-performance-testing/README.md) · [Cheatsheet](18-performance-testing/cheatsheet.md) |
| 19 | **Security Testing (OWASP)** | ~40 | [Security Testing](19-security-testing/README.md) · [Cheatsheet](19-security-testing/cheatsheet.md) |
| 20 | **Microservices Testing** | ~40 | [Microservices](20-microservices-testing/README.md) · [Cheatsheet](20-microservices-testing/cheatsheet.md) |

### 🏗️ Architecture & Design

| # | Topic | Questions | Quick Links |
|---|-------|-----------|-------------|
| 21 | **Design Patterns & Framework Architecture** | ~40 | [Design Patterns](21-design-patterns/README.md) · [Cheatsheet](21-design-patterns/cheatsheet.md) |
| 22 | **System Design for QA** | ~40 | [System Design](22-system-design-for-qa/README.md) · [Cheatsheet](22-system-design-for-qa/cheatsheet.md) |

### 💻 Coding & DSA

| # | Topic | Questions | Quick Links |
|---|-------|-----------|-------------|
| 23 | **Coding & DSA** | ~105 | [DSA Concepts](23-coding-dsa/README.md) · [Array Problems](23-coding-dsa/array-problems.md) · [String Problems](23-coding-dsa/string-problems.md) · [Linked List](23-coding-dsa/linked-list-problems.md) · [Trees & Graphs](23-coding-dsa/tree-graph-problems.md) · [Dynamic Programming](23-coding-dsa/dp-problems.md) · [Cheatsheet](23-coding-dsa/cheatsheet.md) |

### 🤝 Behavioral & Career

| # | Topic | Questions | Quick Links |
|---|-------|-----------|-------------|
| 24 | **Behavioral & Situational** | ~40 | [Behavioral Q&A](24-behavioral/README.md) · [STAR Method Guide](24-behavioral/star-method.md) · [Cheatsheet](24-behavioral/cheatsheet.md) |
| 25 | **Product Company SDET Prep** | ~40 | [Product Company Prep](25-product-company-prep/README.md) · [Real Interview Experiences](25-product-company-prep/real-interview-experiences.md) |

---

## 📦 Included Resources

| Resource | Description | Link |
|----------|-------------|------|
| 📝 **Master Cheatsheet** | Combined quick revision from all 25 topics | [View](resources/master-cheatsheet.md) |
| 💡 **Interview Tips & Strategies** | Do's, don'ts, and strategies for every round | [View](resources/interview-tips.md) |
| 📖 **Recommended Reading** | Books, courses, certifications, and communities | [View](resources/recommended-reading.md) |
| ⭐ **STAR Method Guide** | Complete STAR framework with 10+ QA examples | [View](24-behavioral/star-method.md) |
| 🏢 **Real Interview Experiences** | 10+ real interview experiences from different companies | [View](resources/real-interview-experiences.md) |
| 🎭 **Mock Interview Scenarios** | 10 company-specific mock interviews (Google, Amazon, Meta, etc.) | [View](resources/mock-interview-scenarios.md) |
| 📅 **30-Day Prep Checklist** | Day-by-day study plan with daily targets | [View](resources/interview-preparation-checklist.md) |

---

## 🎯 How to Use This Repository

### 🗓️ 30-Day Preparation Plan

| Week | Focus Area | Topics |
|------|-----------|--------|
| **Week 1** | Core Fundamentals | Java, JS/TS, SQL, Git |
| **Week 2** | Automation Frameworks | Selenium, Playwright, Cypress, Appium, TestNG, Cucumber |
| **Week 3** | API, DevOps & Specialized | REST Assured, Postman, CI/CD, Docker, Performance, Security |
| **Week 4** | Architecture & Soft Skills | Design Patterns, System Design, DSA, Behavioral, Mock Interviews |

### 🔥 Quick Start (Night-Before Revision)

1. Read the [Master Cheatsheet](resources/master-cheatsheet.md)
2. Review the [Interview Tips](resources/interview-tips.md)
3. Practice 2-3 coding problems from [String Problems](23-coding-dsa/string-problems.md) or [Array Problems](23-coding-dsa/array-problems.md)
4. Prepare 5 STAR stories using the [STAR Method Guide](24-behavioral/star-method.md)

### 📊 By Experience Level

| Level | Priority Topics |
|-------|----------------|
| **5-8 Years** | Java, Selenium/Playwright, TestNG, REST Assured, SQL, CI/CD, Design Patterns, DSA |
| **8-12 Years** | All above + System Design, Microservices, Security, Performance, Framework Architecture |
| **12-15+ Years** | All above + Test Strategy, QA Leadership, Product Company Prep, Advanced System Design |

---

## 🏢 Suitable For

This repository helps professionals preparing for interviews at:

- 🏢 **Product Companies** — Amazon, Google, Microsoft, Meta, Apple, Netflix, etc.
- 🦄 **Tech Unicorns** — Stripe, Uber, Airbnb, Flipkart, Swiggy, Razorpay, etc.
- 🏦 **Enterprise / MNCs** — TCS, Infosys, Wipro, Cognizant, Capgemini, Accenture, etc.
- 🚀 **Startups** — Early-stage to Series D funded startups
- 💼 **Consulting** — Deloitte, PwC, EY, McKinsey (tech roles)

---

## 📊 Repository Statistics

| Metric | Count |
|--------|-------|
| Total Questions | **1,257+** |
| Topics Covered | **25** |
| Content Files | **74** |
| Cheatsheets | **25+** |
| Coding Problems | **105** (with optimal Java solutions) |
| Mock Interview Scenarios | **10** (Google, Amazon, Microsoft, Meta, etc.) |
| Real Interview Experiences | **5** detailed write-ups |
| STAR Method Examples | **30+** |
| 📄 Documentation Site | [**Read Online →**](https://boobalakrishnan89.github.io/sdet-interview-prep/) |

---

## 🤝 Contributing

Found an error or want to add more questions? Contributions are welcome!

1. Fork this repository
2. Create a feature branch (`git checkout -b add-new-questions`)
3. Add your questions following the existing format
4. Submit a Pull Request

---

## 📜 License

This repository is licensed under the MIT License. Feel free to use, share, and modify for personal and educational purposes.

---

⭐ If this repository helps you crack your next interview, give it a star!

Made with ❤️ for the QA & SDET community

sdet-interview-prep

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