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Meta Frontend Engineer Interview Guide

Interview Guide Dec 09

Detailed, specific guidance on the Meta Frontend Engineer interview process - with a breakdown of different stages and interview questions asked at each stage

The role of a Meta Frontend Engineer

A Meta Frontend engineer’s primary responsibility is to ensure the visual elements and user interface of Meta's products are appealing and provide an enjoyable user experience. The role requires expertise in HTML, CSS, and JavaScript, which are used to build dynamic and interactive web applications.

The Frontend engineer works closely with product managers, product designers, and software engineers to understand the requirements and design attractive user-facing products. They offer technical guidance to their peers and help create effective Frontend systems to resolve complex web applications.

One critical aspect of the role is recognizing and solving issues related to scalability. Meta is a large platform, and the Frontend engineer must ensure the product they are working on can handle millions of users simultaneously. They are responsible for testing the application under different scenarios to ensure it can handle the load.

Meta offers several Frontend Engineer positions across different teams. Some of the common positions include Product Engineering Frontend Engineer, Ads Frontend Engineer, Business Integrity Frontend Engineer, and Portal Frontend Engineer. These positions are responsible for building the Frontend for various Meta products and services.

How to Apply for a Frontend Engineer Job at Meta?

Check out Meta’s career page and browse through the Frontend Engineer job listings. When you find a role that interests you, be sure to read through the job requirements and qualifications carefully to ensure you meet the criteria. If you have any connections within the company, consider reaching out to them for a referral as it highly increases your chance. When you apply, make sure to tailor your resume to align with the qualifications listed in the job posting. This will help you stand out from other applicants. And if you need help with customizing your resume specifically for Meta (or for that matter, any other company), Prepfully provides resume review services by experienced recruiters in your target company that can give you feedback on your resume. It's worth noting that the application process may vary depending on the position and location, and the company may conduct additional assessments or interviews as part of the selection process.

Meta Frontend Engineer Interview Guide

As a part of the Meta Frontend Engineer interview, you will need to go through multiple interview rounds. The interview process and questions may differ for different positions and roles.

1. Phone screening - The phone screening is designed to evaluate your technical skills and experience in developing and maintaining Frontend applications.

2. Technical Interview - The second round is a technical screening that focuses on your problem-solving abilities, core computer science skills, and ability to build practical applications.

3. Onsite Interview Rounds - The final round at Meta for the Frontend Engineer role consists of multiple onsite rounds, including coding rounds, design/architecture round, and career and coding conversation round.

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Meta Frontend Engineer: Phone Screening

Overview

The phone screening is designed to evaluate your technical skills and experience in developing and maintaining Frontend applications. The interviewer will briefly go over your resume and ask if you have any questions. The interviewer will ask you technical questions related to Frontend development mostly emphasizing on your experience in Javascript.

Interview Questions

  • Imagine it’s your first day here at Meta. What do you want to work on? What 
  • features would you improve on?
  • Why are you interested in Meta? Know about our technical environment, projects, challenges, etc. Your excitement about Meta will go a long way.
  • What are the most interesting projects you’ve worked on? How are they relevant to the Meta environment?
  • What are some of the biggest professional challenges you’ve faced, and how have you overcome them?
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Meta Frontend Engineer: Technical Interview

Overview

The second primary interview is a technical screening that focuses on your problem-solving abilities, core computer science skills, and ability to build practical applications. You will be interviewed by a senior Frontend Engineer at Meta, who will ask you a series of technical questions related to JavaScript, HTML, and CSS.

You will be expected to write code in JavaScript, and focus primarily on getting to a working solution. It is also important to provide a narrative as you work so that the interviewer can gain insight into your thought process.

Some of the topics that may be covered during the interview include algorithms, data structures, design patterns, recursion, graph/tree traversal, and relative performance of JavaScript object and array operations. The interviewer will also expect you to be proficient in JavaScript language and its primitives, including iteration, closures, scope, and writing asynchronous code. Additionally, it will be helpful to recap data structures common in UI engineering like arrays, maps, sets, and DOM trees and understand computer science topics like Big O notation and tree traversal.

Interview Questions

  • For a recursive description of DOM elements i.e. var dom = { type:'div', props:{id:'hello', children:[{type:'h1', children:'HELLO'}]}}. Define a function that prepares actual DOM elements.
  • Can you walk me through your thought process when approaching a coding problem?
  • Explain the difference between null and undefined in JavaScript.
  • How would you implement a function that determines if a given word is a palindrome in JavaScript?
  • Can you explain the concept of closures in JavaScript?
  • How would you implement a function that removes duplicates from an array in JavaScript?
  • Explain the difference between synchronous and asynchronous JavaScript.
  • Can you explain the concept of Big O notation and how it relates to algorithmic complexity?
  • How would you implement a function that flattens a nested array in JavaScript?
  • Can you explain the purpose of the box-sizing CSS property?
  • How would you implement a CSS grid layout?
  • Describe the difference between the float and position CSS properties.
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Meta Frontend Engineer: Onsite Interview Rounds

Overview

The final round at Meta for the Frontend Engineer role consists of multiple onsite rounds, including coding rounds, design/architecture round, and career and coding conversation round.

  1. Coding Rounds: You will have two 45-minute interviews that focus heavily on coding. The engineers will be looking for accurate, bug-free, efficient, and well-thought-out code via whiteboard coding questions. The questions will involve data structures and algorithms, with a practical focus on what you might encounter building user interfaces at Meta. You should provide a narrative as you go through the code to demonstrate your thought process.
  2. Frontend Design/Architecture Round: The design interview is 45 minutes and doesn’t include coding. Instead, you’ll spend the interview talking and using the whiteboard as a visual aid. The interviewer will ask you a very broad design problem and evaluate your solution. The purpose of the interview is to assess your ability to solve a non-trivial engineering design problem. The interviewer will be trying to determine if you can architect a solution to a higher-level problem that requires connecting multiple concepts. Typically, the interviewer is looking to see that you have a good understanding of some of the concepts like browsers, the DOM, performance, API design, etc. Keep in mind - this is not like a typical System Design interview; think of this as “Frontend System Design” which weighs much more heavily on frontend components.
  3. Career and Coding Conversation: You’ll meet with Meta’s engineers to talk about two subjects: you and coding. They’ll ask about you, your history, your résumé, and your motivation. The “you” part is behavioral in the sense that it helps the team assess whether you’ll thrive in Meta’s peer-to-peer, minimal-process, collaborative engineering organization. The coding part is a shorter version of the coding interviews earlier in the day. They include a coding question in this interview to supplement and get additional coding signals. Typically, this part of the interview will be HTML and CSS focused.

Interview Questions

  • Implement a function to reverse a linked list.
  • Given an array of integers, write a function to find the two numbers that add up to a specific target value.
  • Given two strings, write a function to determine if they are anagrams of each other.
  • Implement a function to find the kth smallest element in a binary search tree.
  • Implement a function to check if a binary tree is balanced.
  • How would you design a social media platform feed?
  • Design an online shopping cart system.
  • Can you walk me through your experience working with CSS?
  • Can you tell me about a time when you had to debug a particularly challenging issue on the Frontend?
  • How would you architect the Frontend for a messaging system?

Tips to stand out in the Meta FE Interview

When you are preparing for a Meta Frontend Engineer Interview - we’d recommend keeping these things in mind:

  • Research about Meta's company culture, values, and goals to align them with your career aspirations. You can check out Meta Life to know more about the company culture.
  • Make sure you bring up competing solutions and speak to all their major tradeoffs. Demonstrate that you can make good decisions about how to balance the various tradeoffs.
  • If you only worked with UI libraries before, spend some time learning the raw DOM APIs. If you only used a utility library like Lodash, try to implement some of its methods from scratch. Check how well your solutions work with large inputs, and think about memory consumption and the edge cases you need to handle.
  • Go over data structures, algorithms, and complexity. Be able to discuss the Big O complexity of your approaches. Don’t forget to brush up on your data structures like lists, arrays, hash tables, hash maps, stacks, queues, graphs, trees, and heaps. Also sorts, searches, and traversals (BFS, DFS). And review recursion and iterative approaches.
  • Avoid solutions with lots of edge cases or huge if-else blocks. Deciding between iteration and recursion is always an important step.
  • The interviewer looks for familiarity and experience, it’s not imperative that you’ve memorized tons of DOM, JavaScript and browser APIs.
  • Get comfortable with JavaScript. You need to have a clear understanding of variables, functions, objects, arrays, asynchronous control flow, and closures.
  • Use the SOAR method to mentally organize your thoughts. This will provoke a well thought-out and chronological order of events. Easy to describe, easy to follow.

Responsibilities of a Front End Engineer at Meta

The responsibilities of a Frontend Engineer at Meta across roles can broadly be seen as-

  • Serve millions of Meta users by developing and improving the Frontend of Meta's products and services. For instance, a Frontend Engineer could work on improving the user experience of the Meta News Feed by optimizing the loading time of posts and implementing features to enhance user engagement.
  • Utilize coding, static resource handling, and measuring performance metrics to ensure optimal user experience.
  • Use server coding with Hack, JS Files with Flow, and Jest test to build scalable and efficient applications. A Frontend Engineer could use the Hack programming language to write server-side code for a new Meta feature, ensuring that it is scalable and efficient.
  • Work on projects that require skills such as React, Immutable, Relay, etc. to meet the demands of the project.
  • Collaborate with other teams such as product managers, designers, and software engineers to create and maintain Meta's products and services.
  • Build internal tools, panels, and dashboards for engineers to optimize their workflow and enhance productivity. For example,  build an internal tool that allows other engineers to easily search and debug code, thereby optimizing their workflow and productivity.
  • Be well-versed in programming languages such as HTML, CSS, JavaScript, React, Immutable, Relay, etc.

Skills and Qualifications needed for Front End Engineers at Meta

Here are some skills and qualifications that will help you excel in your Data Science interviews at Meta.

  • It's beneficial to have at least 5+ years of experience in JavaScript, ES6, asynchronous programming, closure, types, etc. which can help you stand out from other candidates.
  • Build experience with browser APIs to improve the performance and functionality of your web applications. This includes understanding concepts such as the DOM, the event loop, and HTTP requests.
  • Optimize Frontend performance by using techniques such as code splitting, lazy loading, and caching. This will help your web applications load faster and improve user experience.
  • Experience using HTML/CSS, layouts, cross-browser accessibility, and specificity. This experience will allow you to write efficient and maintainable code that works across different browsers and devices.
  • Focus on improving your skills with React, as it is a popular and widely-used Frontend framework. This includes mastering concepts such as componentization, state management, and lifecycle methods. Additionally, stay up-to-date with the latest developments in the React ecosystem, such as the use of hooks and functional components.

Salary Ranges

The average salary for a Frontend Engineer at Meta is around $160,000 per year, with a range of $120,000 to $210,000 per year depending on experience and other factors. It's important to note that salaries can vary based on a number of factors such as location, specific job responsibilities, and level of experience.

Conclusion

The interview process for a Frontend Engineer role at Meta typically includes 3 primary rounds - a phone screening, followed by a technical interview round, and the final onsite interview rounds to conclude. The phone screening is designed to evaluate your technical skills and experience in developing and maintaining Frontend applications. The second primary round is a technical screening that focuses on your problem-solving abilities, core computer science skills, and ability to build practical applications. The final primary round at Meta for the Frontend Engineer role consists of multiple onsite rounds, including coding rounds, design/architecture round, and career and coding conversation round.

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