How to Hire a Frontend Engineer
Great frontend engineers combine technical precision with a strong sense of design and user experience. They own the layer your users interact with directly, which means bugs and performance issues are immediately visible. Hiring the right person requires evaluating both engineering depth and product sensibility.
What to Look For
- Mastery of React (or Vue/Angular) and TypeScript — not just ability to follow tutorials
- Strong eye for UI detail: pixel accuracy, responsive layouts, micro-interactions
- Deep understanding of browser rendering, performance, and Core Web Vitals
- Accessibility awareness — building for all users, not just the average case
- Ability to collaborate tightly with designers and translate mockups into polished UIs
- Understanding of the full request lifecycle, even if they don't own the backend
The Hiring Process
- 1
Portfolio and code review
Ask for links to live projects or a GitHub profile. Look at component structure, naming, and whether they write tests.
- 2
Initial technical screen
Cover JavaScript fundamentals, React patterns, and one web performance question. 30 minutes is enough.
- 3
UI challenge (take-home)
Give a realistic component-building task with a Figma mockup or spec. Evaluate accuracy, accessibility, and code quality — not just whether it works.
- 4
Live pairing session
Work through a small bug or feature together. Observe how they think out loud, ask questions, and handle uncertainty.
- 5
Product and design interview
Ask how they'd improve a UI they use every day. Look for genuine product taste and user empathy.
Interview Tips
- Ask 'How do you approach performance optimization on a slow page?' — good answers cover profiling, lazy loading, code splitting, and caching strategies
- Show them a live UI with a bug or accessibility issue — ask what they notice
- Ask about a time a designer's mockup wasn't technically feasible — look for constructive problem-solving
- Probe on state management choices: when to use local state vs. global vs. server state
- Ask how they ensure cross-browser and cross-device consistency
Red Flags
- No testing experience or dismisses it as 'not frontend's job'
- Portfolio shows only tutorials or copy-paste projects with no original thinking
- Can't explain why they made specific component architecture decisions
- No awareness of accessibility (WCAG, aria attributes, keyboard navigation)
- Thinks CSS is unimportant — typically a signal of brittle, unmaintainable UIs
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