Pressure-test your Go, Kubernetes & AWS before the interview

Built for Senior and Principal backend roles: verified questions, runnable Go exercises, and a study plan that tells you where you are weak.

Every answer links to the official documentation — so you can check the reasoning instead of memorising someone's answer key.

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A real question from the free demo

A mutating admission webhook with `failurePolicy: Ignore` times out while the API server is creating a Pod. What is the outcome, and what is the risk that configuration accepts?

Answer: The Pod is created without the webhook's mutation, because Ignore means a failure to reach the webhook is not treated as a rejection; the risk is that a webhook injecting a required sidecar or setting silently stops doing so under load

Read it in the official docs →

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A real coding exercise

The config that panics on write

LoadDefaults is supposed to return a config map with defaults applied, and callers then add their own keys. It compiles, it reads fine, and it panics the moment anyone writes to it. Fix it so the returned map is usable.

func LoadDefaults(overrides map[string]string) map[string]string

Write it, run the tests, see which cases fail — in your browser. The Go interpreter runs on your machine and your code is never uploaded.

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Every answer cited, so you can check it

983 questions across 8 categories — AWS, Go, Kubernetes, AI Agents, System Design, Algorithmic Foundations, Behavioral, Design Patterns. Every explanation links back to official documentation, not exam dumps.

Practise, don't just read

24 Go exercises with real bugs, run in your browser against real tests. Nothing you type is uploaded.

Rehearse under pressure

Timed quizzes and 49 fixed packs you can repeat, so you can tell improvement from a lucky run.

Stop forgetting it

Spaced repetition brings back what you keep getting wrong sooner, and what you know later.

Know where you stand

Accuracy per category and the topics you are worst at — so revision goes where it is needed, not where it is comfortable.

Follow a plan, or don't

A 161-item curriculum if you have weeks, and straight-to-the-quiz if you have days.

Aimed at your level

Senior and Principal scenarios — trade-offs and failure modes, not definitions.

Where do you want to start?

Interview in a couple of weeks

Start with the demo, then drill the categories you are shakiest on. No account needed to begin.

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Preparing over the next few months

Work the study plan, let spaced repetition hold it, and watch the weak areas shrink.

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