If you’re preparing for a Frontend Software Engineer (SWE) interview at Verily (an Alphabet/Google company), you need to be well-versed in JavaScript, React, system design, algorithms, and behavioral questions.
Verily focuses on health-tech and data-driven solutions, so expect questions that test your problem-solving skills, frontend architecture, and ability to build scalable applications.
In this 3000+ word guide, we’ll cover:
– Verily’s interview process
– Top Frontend SWE technical questions (JavaScript, React, CSS)
– System design & coding challenges
– Behavioral interview tips
– How to prepare effectively
🔍 Verily Frontend SWE Interview Process
Verily’s interview process is similar to Google’s but with a stronger focus on health-tech applications. Here’s what to expect:
1. Recruiter Screening (30-45 mins)
– Discuss your resume and experience.
– Why Verily? Why Frontend SWE?
– High-level technical questions.
2. Technical Phone Screen (45-60 mins)
– Coding round (JavaScript + Algorithms)
– Frontend concepts (React, state management, performance)
3. Onsite/Virtual Interviews (4-5 rounds)
– Coding (Data Structures & Algorithms)
– Frontend Deep Dive (React, Redux, Web Performance)
– System Design (Scalable Frontend Architecture)
– Behavioral (Leadership, Collaboration, Problem-Solving)
💻 Top Verily Frontend SWE Technical Questions
Here are some commonly asked Frontend SWE questions at Verily:
🟢 JavaScript Questions
1. Explain Event Delegation in JavaScript. Provide an example.
(Tests DOM manipulation knowledge.)
Answer: Event delegation leverages event bubbling to handle events at a higher level in the DOM rather than directly on child elements.
document.getElementById(‘parent’).addEventListener(‘click’, function(e) {
if(e.target.matches(‘button.className’)) {
console.log(‘Button clicked!’);
}
});
2. What’s the difference between `==` and `===` in JS?
Answer: `==` performs type coercion, while `===` checks value and type.
“5” == 5 // true (coercion)
“5” === 5 // false (strict equality)
3. How does `this` work in JavaScript?
Answer: `this` refers to the execution context (global, function, object, or explicit binding via `call`, `apply`, `bind`).
4. Explain Promises vs. Async/Await.
Answer: Both handle async operations, but `async/await` provides cleaner syntax.
// Promise
fetch(url).then(res => res.json()).then(data => console.log(data));
// Async/Await
async function getData() {
const res = await fetch(url);
const data = await res.json();
console.log(data);
}
⚛️ React Questions
5. Explain React’s Virtual DOM and how it improves performance.
Answer: The Virtual DOM is a lightweight copy of the real DOM.
React compares (`diffing`) the Virtual DOM with the previous state and updates only the changed parts (`reconciliation`), reducing direct DOM manipulations.
6. What are React Hooks? Explain `useEffect` vs `useMemo`.
Answer:
– `useEffect`: Runs side effects (API calls, subscriptions) after render.
– `useMemo`: Memoizes expensive calculations to avoid recomputation.
useEffect(() => {
fetchData();
}, [dependency]);
const memoizedValue = useMemo(() => computeExpensiveValue(a, b), [a, b]);
7. How would you optimize a slow React component Answer:
– Use `React.memo` for memoization.
– Avoid inline functions & objects in props.
– Implement code-splitting with `React.lazy`.
– Use `useMemo`/`useCallback` to prevent unnecessary re-renders.
🎨 CSS & Web Performance
8. Explain CSS Box Model.
Answer: Every HTML element is a box with `content`, `padding`, `border`, and `margin`.
9. How would you improve page load performance?
Answer:
– Lazy-load images & components.
– Code-splitting (Webpack, React.lazy).
– Optimize Critical Rendering Path (inline critical CSS, async/defer JS).
– Use CDN for assets.
10. Difference between `flexbox` and `grid`?
Answer:
– Flexbox: 1D layout (row or column).
– Grid: 2D layout (rows + columns simultaneously).
📊 System Design Questions
Verily expects frontend system design knowledge for scalable applications:
11. Design a Real-Time Health Dashboard (Like Verily’s Products)
Approach:
– Data Fetching: WebSockets for real-time updates.
– State Management: Redux/Context API for global state.
– Caching: Use `localStorage` or Service Workers for offline access.
– Scalability: Component-based architecture with lazy loading.
– Security: JWT for API auth, HTTPS for data encryption.
12. How would you design a responsive medical data visualization tool?
Answer:
– Use D3.js or Chart.js for interactive charts.
– Implement responsive CSS (media queries, relative units).
– Optimize rendering with React Virtualized for large datasets.
🗣️ Behavioral Interview Questions
Verily values collaboration, problem-solving, and mission alignment:
13. Tell me about a time you improved frontend performance.
(Use STAR method: Situation, Task, Action, Result.)
14. Describe a conflict with a teammate and how you resolved it.
Example: “Disagreed on tech stack → Discussed pros/cons → Agreed on React for consistency.”
15. Why do you want to work at Verily?
Tip: Mention interest in health-tech, data-driven solutions, and Alphabet’s mission.
🎯 How to Prepare for Verily Frontend SWE Interview
1. Master JavaScript & React (Practice on [LeetCode](https://leetcode.com/), [FrontendMasters](https://frontendmasters.com/)).
2. Study System Design (Read [Designing Data-Intensive Applications](https://dataintensive.net/)).
3. Mock Interviews (Use [Pramp](https://www.pramp.com/) or [topinterviewquestions.in]
4. Review Verily’s Projects (Check [Verily’s GitHub](https://github.com/verily)).
🔚 Final Thoughts
Verily’s Frontend SWE interview is challenging but rewarding. Focus on:
✅ Deep JavaScript/React knowledge
✅ Performance optimization techniques
✅ System design for scalable apps
✅ Strong behavioral responses
Need more help? Check out [TopInterviewQuestions.in](https://topinterviewquestions.in) for detailed guides and mock interviews!
Good luck with your Verily interview! 🚀