Practice the coding round in the browser. Python runs locally in your browser (no server, no waiting). Ten other languages run in a secure sandbox. Pick a challenge and hit Run tests to be graded like a real interview.
Run your code to see output here.
Not algorithm golf. SDET and QA-automation coding rounds sit a level below LeetCode hard: string and list manipulation, dictionaries and sets, parsing structured text, small data transformations — log lines in, summary out. What's being judged is whether you can write a correct, readable function without an IDE holding your hand, talk through it while you do, and test your own code before declaring it done. That last one is the part specific to QA interviews: a candidate who runs their function against the edge cases without being prompted is demonstrating the job.
The challenges here are built to that level. Each one states a problem the way an interviewer would, grades against hidden assertion tests, and shows you the failing case when you're wrong — because reading a failure and fixing it is also the job.
Solve without a reference solution open. The single most common way people stall is tutorial dependency: able to follow any video, frozen on a blank editor. The lab is deliberately a blank editor. If you're stuck for more than a few minutes, that's information — it tells you which fundamentals to go back to on the roadmap rather than which snippet to copy.
Python runs entirely in your browser, so there is no setup, no account wall, and your code never leaves the page. Ten other languages run in a secure sandbox for free practice. When you can clear the graded challenges cold, the next rungs are the SDET question bank for the design and architecture rounds, and a take-home assignment done on a timer for the full rehearsal.