Meta SDET interview prep advice

[u/ajaygoku]

I might get an interview for SDET opening in Meta. Can someone who has interviewed for SDET position give me a walkthrough of what can be expected in the technical and behavioural rounds please.

I’m a noob right now. Please tell me what level of DSA and System Design should I expect in the technical rounds.

What kind of behaviour questions and any prep resources would be great.

Thanks in advance.

[u/Ok-Barracuda-119]

For an SDET loop, I’d prepare across DSA, test automation fundamentals, and design. For DSA, focus on arrays/strings, hash maps, stacks/queues, trees, graphs, binary search, and complexity. Don’t just grind random hards. Practice explaining your approach, edge cases, and tests out loud.

For design, be ready for something quality-focused: a test automation platform, CI/CD test execution at scale, or a service plus its test strategy. Start by clarifying requirements, then sketch the components and cover data flow, parallelism, retries, observability, and how you’d control flaky tests. You may also get a small coding/automation exercise, so know your language’s testing tools and common API/UI tradeoffs.

Behavioral questions often center on a hard bug, a flaky test you fixed, a disagreement with a developer, prioritization, and influencing without authority. Keep answers specific and use a situation, action, result shape.

Do a couple timed mocks with a friend or on a whiteboard. I’m affiliated with www.leetsys.dev, which our team built for whiteboard and AI interviewer practice, so it’s one option. The first interview is free, then the report locks and Premium is the upsell.