red→green

Test automation, written down properly

Manual QA → SDET

I interview SDET candidates for a living. Before that I was a manual tester trying to work out how to cross over. This is what I wish someone had written down.

WhoMayank Chaudhari
Day jobSenior SDET, testing AI agents in production
AlsoI interview SDET candidates
DegreeMechanical Engineering. Never once asked about it.

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Three things worth your time, in the order most people need them.

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Where would you land in an SDET interview?

Fifteen questions about what you have actually built and done, scored the way I score candidates when I sit on the hiring panel. You get a number, the gaps that would sink you, and what to fix first.

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The plan

Manual QA → SDET in 90 days

What to learn, what to skip, and what you should have to show at the end. Built for 30 minutes a day around a full-time job.

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AI testing

Checking the shape before the answer

The first test I write for any AI feature has nothing to do with AI. A schema assertion, and why it catches more than an eval suite.

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Terminology

"Manual testing" is the wrong term

Why the word exists, how it decays from a label into a budget line, and why development is growing its own version right now.

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Why this exists

Most advice for manual testers moving into automation is either a tool tutorial or a motivational post. Neither tells you what a hiring panel is actually looking at.

I sit on that panel. I also made this exact transition, recently enough to remember which parts hurt — a Mechanical Engineering degree, manual testing on kiosk software, and now a Senior SDET role where the thing under test is an AI agent whose output changes every run.

Everything here is written from that seat. No affiliate links, no course funnel.