How to interview frontend engineers
Interview frontend engineers on real UI work: build a component with their own AI tools, design a live dashboard, then explain the code they shipped.
- 1✓AI screening interviewInterfaces they shipped and ownedARIARunningStrong · 86
- 2✓Vibe codingAn accessible select, built with AI toolsNIXRunningScreen reader ready
- 3✓System designA live dashboard with 10,000 rowsMAXRunningHire · 85
- 4✓Follow-upThe decisions inside their own componentNIXRunning1 edge case missed
The frontend engineer interview loop
Four rounds, each run by an AI interviewer with its own report. Candidates take every round on their own schedule.
Tell me about an interface you shipped and owned. What did you change after real users tried it?
Round 1 · AI screening interview
Interfaces they have shipped and owned
A real two-way conversation that follows up on the answers the candidate actually gives.
- 1✓Data inOne WebSocket, updates batched every secondStreamRunningSolid
- 2✓StateRows kept by ID, only changed rows re-renderStoreRunningEfficient
- 3✓TableVirtualised, about 40 rows in the DOMRenderRunningFast
- 4✓Connection dropsShows the last update time, reconnectsResilienceRunningHandled
How does a screen reader user hear about new rows?
Round 3 · System design
The frontend architecture of a live dashboard
The candidate designs on a shared whiteboard while the AI probes trade-offs and failure modes.
Build a searchable select that works with a keyboard and a screen reader
| Check | What the AI found | Result |
|---|---|---|
| Arrow keys | Move the active option | CheckingPass |
| Screen reader | Announces the active option | CheckingPass |
| Escape | Closes and returns focus | CheckingPass |
Round 2 · Vibe coding
An accessible UI component, built with AI tools
The candidate builds with their own AI tools; the AI scores how they prompt, review and fix the output.
Your AI tool wrote the keyboard handling. What happens when the filter matches nothing?
Round 4 · Follow-up interview
The decisions inside their own component
The AI questions the candidate on their own earlier work, so you see whether they understand it.
What to assess in a frontend engineer interview
Score every candidate on the same 6 skills, rated against evidence from the rounds, so two reviewers reach the same call.
- UI engineering
- Accessibility
- Web performance
- Frontend architecture
- Working with AI tools
- Code review judgment
Frontend engineer interview questions
Use them in your own loop, or let ARIA, NIX and MAX ask them, follow up on the answers and score them.
Tell me about an interface you shipped and owned. What did you change after real users tried it?
Build a searchable select component with your own AI tools. It has to work with a keyboard and a screen reader.
Design the frontend for a dashboard that updates every few seconds. How do you keep it fast with 10,000 rows?
Your AI tool wrote the keyboard handling. Walk me through what it does and what you changed.
What would you check first if this page felt slow on a cheap phone?
Integrity in every round
A second voice or screen, pasted work and claims that contradict earlier rounds are flagged with timestamps.
No scheduling between rounds
Frontend engineers take each round when they are ready, in any time zone.
Your team makes the call
Hello Recruiter evaluates and organises the evidence. People decide who moves forward.
Frequently asked questions
How do you interview frontend engineers?
Interview frontend engineers on real UI work: build a component with their own AI tools, design a live dashboard, then explain the code they shipped. A strong loop has four rounds: AI screening interview (interfaces they have shipped and owned), vibe coding (an accessible UI component, built with AI tools), system design (the frontend architecture of a live dashboard) and follow-up interview (the decisions inside their own component).
What skills should you assess in a frontend engineer interview?
UI engineering, Accessibility, Web performance, Frontend architecture, Working with AI tools and Code review judgment. Rate each one Very strong, Strong, Weak or Very weak against evidence from the rounds, not impressions.
How does Hello Recruiter detect cheating in frontend engineer interviews?
Every round is monitored for integrity signals such as a second voice or screen, work pasted in from outside the workspace, and claims that contradict earlier rounds. Each signal is timestamped in the candidate's report.
What does the hiring team get after each round?
A report with an AI score out of 100, criteria marked Met, Not met or Not yet evaluated, skills rated Very strong to Very weak, a risk level and timestamped integrity signals. Hello Recruiter evaluates; your team decides.
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Run this loop on your next frontend engineer hire
Start from this loop or generate one from your job description. Your team makes the call.
