ReactSenior level.
Tests them on performance and memoisation, error and suspense boundaries, context design, and keeping a large component tree predictable.
What's included
- Only reviewed, approved questions
- Every question editable before it’s sent
- Timed at 60 minutes
- Camera, screen and microphone recording
- Leaving the tab is logged
- Copy and paste blocked
- Scored automatically, with reasons for written answers
What the 439 questions ask.
Multiple choice
One right answer or several. Marked the moment they submit.
Debugging
Code with a bug in it. They find what is wrong and say how to fix it.
Drawn from 56 topics
How many approved Senior questions the bank holds on each.
- Concurrent rendering & Suspense22
- Lists & virtualization21
- Navigation18
- Data fetching16
- Performance16
- Styling & layout16
- Tooling, release & security16
- Expo & EAS15
- Animations & gestures14
- Performance & memoization14
- Core components13
- State & hooks12
- Testing12
- Architecture & composition11
- Architecture & native modules11
- Components & JSX11
- External stores11
- Accessibility10
- Effects & lifecycle10
- Storage & offline9
- Platform & device APIs8
- Testing components8
- Accessibility in React7
- Context7
- Forms & actions7
- Hooks rules7
- Profiling7
- Rendering & reconciliation7
- Data fetching6
- Error boundaries6
- Forms & input6
- Keyboard & safe areas6
- Migrations6
- React Compiler6
- TypeScript with React6
- Forms & controlled inputs5
- Refs & DOM5
- Security5
- Server Components5
- Virtualization5
- Keys & lists4
- Refs4
- Styling4
- Built-in hooks3
- Server rendering & React 193
- State & updates3
- Custom hooks2
- Data fetching patterns2
- Portals2
- State & useState2
- Suspense & lazy2
- Data fetching advanced1
- Lists & keys1
- Props & children1
- Refs & useRef1
- State architecture1
From test to shortlist in three steps.
- 01
Pick a test
Choose the skill and the level. Every question can be edited or swapped before anything is sent.
- 02
Send one link
Candidates take it in the browser from one link, against the clock.
- 03
Read the scores
Multiple choice marks itself. Written answers get a score with the reasoning behind it, so a surprising number can be checked.
About the React test.
What employers ask before sending the Senior React test, answered with its real figures.
How long does the Senior React test take?
20 questions in about 60 minutes. The clock is set to 60 minutes by default. Switch timing off in the test’s settings and the duration becomes a suggestion instead of a limit.
What kinds of questions are in it?
It mixes multiple choice and debugging questions. Coding questions are answered in a code editor in the browser. Its questions run from intro to expert difficulty.
How is it scored?
Automatically. Multiple choice marks itself the moment the candidate submits. Written answers are scored against a model answer, with partial credit for an answer that is partly right, and every written score comes with the reasoning behind it so a surprising one can be checked.
Which React level should I send?
React comes at 4 levels: Junior (20 questions, 35 min), Mid (20 questions, 35 min), Senior (20 questions, 60 min) and Staff (20 questions, 60 min). Junior draws on introductory questions, Mid draws on intermediate questions, Senior draws on advanced questions and Staff draws on expert questions. Pick the level the role needs, not the one on the candidate’s CV.
Can I change the questions?
Yes. Using a test puts a draft in your account, and you can edit, remove or swap any question before it goes to anyone.
How do you keep every result fair and honest?
New tests start with camera, screen and microphone recording on, every time the candidate leaves the test tab logged, copy and paste blocked outside the code editor and questions hidden while the window isn’t in front, and printing blocked. Each is a switch in the test’s settings. You can also set how many times a candidate may leave the tab before the test submits itself, and shuffle the question order and answer options for each candidate.
Why can’t I see the questions on this page?
A public page with the questions on it is an answer key for every candidate who finds it. Sign up free and using the test puts every question in front of you to review before anything is sent.
What does it cost?
Nothing to start: sign up free, with no card. The plans and their limits are on the pricing page.
Send it today.
Sign up, and this test is waiting in your library, one click from a link you can send.