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Quick skill assessment

No right or wrong — just helps us calibrate your learning path.

01 / 07 — Fundamentals

When you encounter a failing test, what's your first move?

Read the error message and Google the exact text Add logging to trace the execution path before searching Reproduce the failure in isolation, form a hypothesis, then test it

02 / 07 — Architecture

A colleague's PR adds a 500-line service class. Your review comment is:

LGTM — it works and the tests pass Can we split this into smaller functions for readability? This violates SRP — here are the specific domain boundaries I'd draw and why

03 / 07 — Performance

Users report the search page is slow. First thing you check:

Reload the page a few times to see if it's consistent Open DevTools network tab and look at response times Profile server-side query plans, check for N+1 patterns, then measure before optimizing

04 / 07 — Security

A new endpoint accepts user input and inserts it into a DB query. You:

Ship it — the frontend validates the input Sanitize the input string before inserting Use parameterized queries only — sanitization doesn't prevent SQL injection reliably

05 / 07 — Testing

How do you decide what to test?

I test when QA finds bugs I should've caught I write tests for the happy path of important features I test behavior at boundaries, edge cases, and failure modes — the pyramid guides coverage decisions

06 / 07 — Architecture

How do you handle a growing codebase that's getting hard to navigate?

Add more comments so future developers understand it Rename variables and functions to be more descriptive Identify seams, enforce domain boundaries, and iteratively extract cohesive modules

07 / 07 — Fundamentals

What does "a function should do one thing" actually mean in practice?

It should be short — under 20 lines It should have a single clear name that describes what it does It should have one reason to change — one actor, one responsibility level, no hidden side effects

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