SDET stands for Software Development Engineer in Test — a tester who writes code. Instead of checking software by hand, an SDET builds the automated tests that check it, and the framework those tests run in.
The role sits between testing and development: you need real programming ability in Java or Python, and the testing judgement to know what is worth automating in the first place.
Both roles are about finding defects. The difference is whether you find them by hand or by writing a program that finds them for you.
| Manual tester | SDET | |
|---|---|---|
| Core work | Runs the application and reports defects | Writes code that tests the application automatically |
| Programming | Not required | Required — usually Java or Python |
| Main tools | Test case management, bug trackers | Selenium, REST Assured, Postman, Git, CI pipelines |
| Works with | QA team | Development team, often inside it |
| Typical pay | Entry level for QA | Higher — closer to a developer's band |
Moving from manual QA to SDET is a common and realistic step — the testing judgement already transfers, and what you add is the coding layer.
Six layers, each building on the one before. CDPL teaches these as separate courses you can take together or in sequence.
Java or Python — the language you write every test in. Variables through to OOP, because frameworks are built with classes and inheritance.
Java courseTest design, defect reporting, and knowing what is worth automating. Automation without this only produces failures faster.
Manual testing courseSelenium and modern alternatives — locating elements, handling waits, and structuring suites so they do not turn flaky.
Automation testing coursePostman and REST Assured. Most defects surface at the service layer, and API tests run faster and break less often than UI ones.
API testing courseQuerying data to verify what the application actually stored, rather than trusting the screen.
DBMS courseGit, and running the suite automatically on every change so failures are caught at the commit that caused them.
Master programmeTalk to a CDPL counsellor about the current fee, the next batch date, and whether the full SDET track or a single course fits where you are now.
