Master test automation.
Get hired as an SDET.
Free, hands-on tutorials across your automation stack — with an interactive roadmap, 30+ browser tools, and SDET interview prep from real companies.
Start here
Three simple on-ramps depending on where you are today.
Brand new to testing
Begin with manual QA and testing fundamentals — no coding needed yet.
Start the basics →Ready to automate
Jump into Selenium or Playwright with runnable code and real debugging.
Learn a tool →Prepping to interview
Practice 150+ questions and mock rounds for product-company SDET roles.
Open interview prep →Browse all topics
Each is a hub with tutorials, a visualizer, and interview questions.
QA tool comparison matrix
Speed, language support and best-fit use case for the main automation tools — at a glance.
| Tool / framework | Type | Language | Speed | Setup | Best for |
|---|---|---|---|---|---|
| Selenium WebDriver | UI | Java, Python, C#, JS | Medium | Moderate | Cross-browser E2E testing |
| Cypress | UI | JavaScript / TS | Fast | Easy | Front-end E2E testing |
| Playwright | UI | JS, Python, Java, C# | Very Fast | Easy | Modern browser automation |
| WebdriverIO | UI | JavaScript | Fast | Moderate | Node.js browser automation |
| Postman | API | GUI / JavaScript | Fast | Very Easy | Manual + automated API testing |
| REST Assured | API | Java | Fast | Moderate | Java API test automation |
| JMeter | Perf | Java / GUI | Medium | Moderate | Load & performance testing |
SDET interview prep, done right
Topic simulators, company question banks, and mock interviews.
Topic interview simulators
Run a realistic Q&A on the exact stack you are interviewing for, with an answer key for every question.
Company-Wise Prep
Amazon, Google & Microsoft QA questions.
200+ questions →Mock SDET Interview
AI-driven mock with feedback on your answers.
Start a mock →SDET Interview Questions
Curated questions across every topic.
Browse questions →Interview Rounds Guide
What each round tests, and how to prep.
See the stages →Tool of the week
A different free tool spotlighted each week.
Selenium Exception Lookup
Paste any Selenium exception and get the real cause, the fix, and an interview-ready explanation — instantly.
Open the tool →✗ StaleElementReferenceException
cause: element re-rendered after lookup
✓ fix: re-find inside a wait
interview: "Explain when it happens…"
Six steps from tester to hired SDET
A guided sequence — follow it in order, or jump to any step.
Foundations
Manual · Java
Selenium
WebDriver
API
REST Assured
CI/CD
Jenkins
Frameworks
Playwright
Offer
Interviews
Not sure where to start?
Follow the roadmap step by step — it is the fastest route to job-ready.
Latest tutorials
Selenium to Playwright Migration Guide (2026): Complete Concept Mapping
How Would You Test a Pencil? Interview Answer with 40+ Test Cases
The Complete Selenium WebDriver Tutorial (2026): Basics to Framework
Selenium Errors and Exceptions: The Complete Troubleshooting Guide
30+ interactive tools
Free, no signup — build intuition and prep faster.
Frequently asked questions
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