Inside My Front‑End Interviews at 7 Top Tech Companies: Questions & Insights

Personal Interview Journey

Amid a wave of layoffs and a tough job market, the author describes taking a break after resigning, then actively applying for front‑end roles, receiving multiple interview invitations, and ultimately securing offers from several companies.

Companies Interviewed

The author interviewed with seven companies, including major firms such as Meituan, Tencent, SenseTime, as well as smaller companies like KuJiaLe, Sensors Analytics, Tianyancha, and the state‑owned China Life.

Key Takeaways

The interview process is extremely demanding—often more exhausting than a typical 996 schedule—requiring continuous mental effort, post‑interview reflection, and a positive mindset to succeed.

Preparation Checklist

1. Core Knowledge (八股文)

JavaScript fundamentals : prototype chain, inheritance, event loop, scope, ES6 syntax, garbage collection and memory leaks.

Network communication : browser cache, HTTP/2, HTTPS handshake, TCP/UDP, DNS resolution, CDN caching.

HTML & CSS : layout concepts, box model, positioning, responsive design.

Front‑end frameworks : deep understanding of React (diff, hooks, Fiber) and Vue (reactivity, Vue 3 features).

Build tools : Webpack loaders and plugins, tree‑shaking, code splitting, hot‑module replacement, plus a brief look at esbuild.

Additional skills : familiarity with other programming languages as a plus.

2. Algorithms

Focus on commonly asked topics such as sorting, recursion, linked lists, and dynamic programming; practice regularly on platforms like LeetCode, ideally starting two months before interviews.

3. Resume

Include useful information (personal details, education, skill hierarchy, project highlights), ensure authenticity, and keep the document concise—about two pages.

4. Self‑Introduction

Deliver a 2‑3 minute introduction without project details, rehearse it beforehand, and avoid reading directly from the resume.

Interview Questions by Company

Meituan

Describe the most challenging project you have built.

How to prevent event propagation in the DOM?

Common ES6 syntax and how var can emulate let.

Differences between React Hooks and class components.

When to use useCallback vs useMemo in React.

Explain the browser event‑loop mechanism.

Is setState synchronous or asynchronous?

Use Set to deduplicate an array.

How to use GraphQL.

Mobile adaptation strategies: differences between rem and em.

What problems does React solve?

How to handle cross‑origin requests.

Programming task: implement setInterval using setTimeout.

Tencent

Explain Vue’s two‑way binding mechanism.

Differences between ByteDance mini‑programs and WeChat mini‑programs.

Describe the React Fiber architecture.

Principles behind React Hooks.

Performance issues encountered with Node and mitigation strategies.

How to avoid blocking when Node performs heavy computations.

Runtime generation logic of low‑code platforms.

Performance optimization techniques for low‑code platforms.

Release workflow of low‑code platform components.

Responsibilities and processes of the previous employer.

Future career planning.

Preferred work direction.

Programming task: given two arrays, return the length of the longest common sub‑array.

SenseTime

Underlying principle of less-loader converting LESS to CSS.

Differences between Webpack loaders and plugins.

Common Webpack plugins.

How Webpack performs code splitting.

Webpack tree‑shaking mechanism.

Dynamic import in Webpack.

Hot‑module replacement in Webpack.

New features of Webpack 5.

Differences between ESM and CommonJS.

TypeScript type vs interface.

How to create enums in TypeScript.

Generics in TypeScript.

Canvas drawing workflow and cross‑origin image handling.

Project experience: implementation of a Babel plugin.

Coding task: implement a deep copy function.

Sensors Analytics

Comparison of CSS preprocessors.

CSS positioning values.

Prototype chain and inheritance implementation. this binding and differences between call and apply.

Differences between Vue 3 and Vue 2.

Purpose of Vue.$nextTick.

Diff algorithm differences between Vue and React.

Usage of proxy interceptors.

DNS resolution process.

Event loop explanation.

Closures and memory leaks.

Highlight project description.

HTTP idempotency and related methods.

Advantages of Redux’s unidirectional data flow and middleware implementation.

React HOC vs render props.

Browser threads vs processes.

Differences between requestAnimationFrame and requestIdleCallback.

NPM pain points and solutions.

Gitflow branching model.

WebSocket connection establishment.

Packaging formats (CommonJS, ESM, UMD) and their differences.

Differences between HTTP 301 and 302.

H5 performance optimization.

Coding task: design a flat function to flatten nested arrays without altering original data types.

Wangzhe Rongyao (Honor of Kings)

Inter‑process communication methods.

TCP/IP reliability mechanisms.

Use cases for symmetric and asymmetric encryption.

Browser frame‑rate detection.

Design philosophies of Vue and React.

Performance metrics FP, FCP, FMP and influencing factors.

Technical principles of low‑code platforms.

Comparison of other low‑code platform implementations.

NGINX reverse proxy and load balancing.

Coding task: implement an LRU cache with get(key) and put(key, value) operations.

Tianyancha

JavaScript data types.

Methods to identify data types and their drawbacks.

Prototype chain and inheritance implementation.

What happens during new execution.

Usage of Symbol type.

Execution order of defer vs async scripts.

React Router modes and dynamic route ID extraction.

Implementation principle of Redux middleware.

Differences between React PureComponent and regular components.

Generator function usage.

React diff algorithm details.

Vite bundler usage.

Differences between arrow functions and regular functions.

Concept of execution context.

Heap vs stack memory and where arrays are stored.

Improvements of HTTP/2 over HTTP/1.0.

Difference between isNaN and Number.isNaN.

Closures and memory leaks.

Whether setState is synchronous or asynchronous.

Differences between HTTP and HTTPS.

Why React Hooks useState cannot be placed inside conditional statements.

Browser same‑origin policy explanation.

KuJiaLe

Node performance monitoring techniques.

React diff node movement process.

Browser caching mechanisms.

Optimal ES5 function inheritance and static property inheritance.

Front‑end performance monitoring.

V8 garbage‑collection optimizations.

Causes of memory leaks and detection methods.

Differences between scope and execution context.

Understanding this binding.

Array methods: forEach vs map.

Differences between for…of and for…in, and how to get index in for…of.

Mobile layout solutions and root font‑size settings.

Differences among Webpack bundle, chunk, and module.

How Webpack hot‑update finds and updates specific modules.

Project experience: implementation of a Babel plugin.

China Life

Differences and drawbacks of HTTP/2 vs HTTP/1.0.

Closures and their use cases.

Design ideas for a sidebar component.

Browser caching mechanisms.

Reflow vs repaint and reduction strategies.

DOM event mechanism and non‑bubbling events.

Cookie vs session differences.

SQL CRUD operations.

Web security: XSS and CSRF characteristics and defenses.

Conclusion

The author wishes all readers success in securing their ideal offers and encourages continuous learning and practice.