Core UI patterns
Most prompts map to a small catalog of patterns. Learn the catalog deeply instead of memorizing one-off solutions.
- Overlays: modal, tooltip
- Navigation: tabs, accordion, tree
- Input: forms, autocomplete
UI coding rounds
UI coding interview questions
UI coding interviews measure whether you can turn a prompt into a working interface. Practice the component patterns companies reuse constantly — then harden them for accessibility and edge cases.
If a job description mentions a “UI round”, “frontend coding round”, or “machine coding round”, prepare the same way: build small products fast, narrate decisions, and leave time for polish.
HelloFrontend focuses on interactive practice in the browser so your prep matches the interview environment.
What “good” looks like
A passing solution is correct, readable, and resilient. Bonus points for keyboard support and clear component boundaries.
- Happy path works quickly
- Empty and error states exist
- Code is easy to extend
Pair with JS utilities
UI rounds often need debounce, throttle, or async helpers. Practice those utilities separately so they do not slow you down mid-round.
- Debounce search input
- Throttle scroll handlers
- Abort stale requests
UI coding practice set
Modal SystemOverlay UX and focus management.Accessible TabsKeyboard-friendly tabbed UI.AccordionExpandable sections with a11y basics.Multi-step FormMulti-page form state and validation.TooltipHover/focus content without breaking layout.Image SliderCarousel controls and transitions.Tic-Tac-ToeInteractive board with game rules.Kanban BoardDrag-and-drop task board UI.File ExplorerRecursive tree navigation UI.Throttle (JS)Utility used heavily in scroll/resize UI.
Recommended next pages
FAQ
What are UI coding interview questions?
UI coding interviews ask you to implement interactive interfaces — components, forms, lists, overlays — with correct behavior, clean structure, and thoughtful edge cases.
Are UI coding rounds the same as machine coding?
Mostly yes in product companies. “UI coding”, “machine coding”, and “frontend coding” usually mean the same practical build-a-component round; naming varies by company and region.
Do I need CSS perfection?
Pixel-perfect design is rarely the bar. Interviewers want readable layout, responsive basics, and interaction correctness more than visual polish.
How should I prepare?
Practice a core set of components until you can implement them calmly in 30–45 minutes, then vary constraints like keyboard support, debouncing, or API failures.