Commonly Asked Facebook Interview Questions for Job Applicants - IQCode

Facebook Interview Questions

There are 64 interview questions that have been found for Facebook.

// This code is not actual code, just an example /** * This class represents a user's profile on Facebook */ class FacebookProfile { // variables representing the user's information private String name; private int age; private String city;

// constructor to create a new profile with given user information public FacebookProfile(String name, int age, String city) { this.name = name; this.age = age; this.city = city; }

/** * Getter methods for name, age, and city variables */ public String getName() { return this.name; }

public int getAge() { return this.age; }

public String getCity() { return this.city; }

/** * Setter methods for age and city variables */ public void setAge(int age) { this.age = age; }

public void setCity(String city) { this.city = city; }

/** * This method is used to post a new status update */ public void postStatusUpdate(String status) { System.out.println(this.name + " posted a new status: " + status); } }

// example usage of the FacebookProfile class public static void main(String[] args) { FacebookProfile user = new FacebookProfile("John Doe", 25, "New York City");

// print the user's name, age, and city System.out.println("Name: " + user.getName()); System.out.println("Age: " + user.getAge()); System.out.println("City: " + user.getCity());

// update the user's age and city user.setAge(26); user.setCity("Los Angeles");

// post a new status update user.postStatusUpdate("Feeling great today!"); } Facebook: A Brief Overview

-------------------------

Facebook has had an incredible journey from its origins as a student directory to becoming one of the largest social networking sites in the world. Created by Mark Zuckerberg with the aim of connecting college students, the platform has now expanded to over a billion users, illustrating the company's remarkable stature. As a result, the Facebook interview process is not to be taken lightly. While it provides an opportunity to learn, it is far from an easy interview process.

Facebook's mission is to give people the power to build communities and bring the world closer together. As the largest social media platform in the world, they understand the need to keep their users safe and content while also providing value every day.

Their impressive statistics demonstrate their commitment to creating change and fostering a positive community. For instance, they have raised $5 billion+ for the community and have over 200 million active businesses connecting and growing with Facebook.

Furthermore, the platform has 1 billion+ stories shared every day by the people and 100 billion+ messages shared daily, ensuring that everyone stays connected.

Facebook values change, growth, and community building, making it an excellent place to develop your career as a software engineer. To Facebook, employment benefits and perks are just a small part of their approach to creating a comprehensive positive work environment for their employees, who they consider to be their most valuable assets.

[Facebook Headquarters]

Facebook Interview Process and Tips

For candidates looking to join Facebook, it is important to know what to expect from the interview process. This article will discuss the interview process at Facebook, provide tips for interviewing, offer a sample coding question, and answer some frequently asked questions about Facebook interviews.

Interview Process at Facebook

Facebook's interview process varies depending on the position. Typically, candidates will go through several rounds of interviews, starting with a phone screen. If the phone screen goes well, the candidate will be invited to an on-site interview at a Facebook office. The on-site interview will consist of multiple rounds, including technical and behavioral interviews. Candidates can expect to meet with different members of the team, including the hiring manager and future colleagues.

Facebook Coding Question

Here's a sample coding question that you might encounter during your Facebook interview:

Given a string of lowercase English letters and a positive integer k, return the minimum number of changes needed to create a string where no two adjacent letters are the same. 

This question tests the ability to manipulate strings and solve problems with algorithms. Remember to explain your thought process and ask any clarifying questions before starting to code.

Tips for Interviewing at Facebook

Here are a few tips to help you prepare for your interview at Facebook:

  • Review Facebook's core values and mission statement.
  • Practice your coding skills and problem-solving abilities.
  • Prepare for behavioral interview questions.
  • Be prepared to discuss past projects and experiences.
  • Research the team and position you are interviewing for.
  • Be yourself and show your passion for the industry and the company.

FAQ for Facebook

Here are some frequently asked questions about Facebook interviews:

  • How long does the interview process take?
  • It depends on the position, but the process can range from a few weeks to a few months.

  • What should I wear to the interview?
  • Dress code at Facebook is casual, but it's always best to err on the side of professionalism.

  • When will I hear back after the interview?
  • It can take a few days to a few weeks to hear back after your interview.

  • Is it okay to ask for feedback after the interview?
  • Absolutely! It shows that you are interested in improving and learning from the experience.

Facebook's Software Engineering Interview Process: A Comprehensive Guide

Overview of the Interview Process

The Facebook interview process consists of several rounds of interviews:

- Recruiter Connect: The candidate should have a good job profile to catch the attention of an HR recruiter from Facebook. After passing the initial screening, the candidate will receive further resources to prepare for upcoming interviews. - Interview Rounds: Facebook conducts a total of 7 interviews. First two are phone screenings to assess the candidate's behavior followed by coding, design, and behavioral interviews at the onsite location. The candidate will also have an opportunity to learn about the company culture during lunch with a current employee. - Post-Interviews: The candidate's interview performance and resume is evaluated during the candidate review meeting, which the hiring panel makes recommendations based on. - Hired: Once the team gives the green light and the candidate accepts the job offer, the recruiters prepare and deliver the official job offer letter.

Interview Rounds

- Phone Screenings: The first phone screening checks the candidate's behavior, while the second assesses technical skills. - Algo DS Interviews: The candidate will typically undergo several coding interviews, one design interview, and one behavioral interview. Each interview takes approximately 45 minutes. Experienced candidates will have more design interviews than junior candidates.

Cracking the Facebook Software Engineering Interview

To succeed in the Facebook interviews, here are some tips:

- Strengthen problem-solving skills and become proficient in data structures and algorithms. - Be prepared for a mix of coding, design, and behavioral questions to test technical and soft skills. - Brush up on knowledge of databases, distributed systems, and web technology. - Learn about Facebook's vision, values, and products to demonstrate alignment with the company culture and values.

In conclusion, the interview process at Facebook may appear daunting, but with preparation and practice, candidates will be able to present their best selves and showcase their technical and soft skills.Facebook Coding Questions

--- ### Longest Increasing Subsequence Given an array of integers, find the longest increasing subsequence. In other words, find a subsequence of the array in which the subsequence's elements are in strictly increasing order, and the subsequence is as long as possible.

Code:

python
def longest_increasing_subsequence(nums: List[int]) -> int:
    n = len(nums)
    if n == 0:
        return 0
    dp = [1] * n
    for i in range(1, n):
        for j in range(i):
            if nums[i] > nums[j]:
                dp[i] = max(dp[i], dp[j] + 1)
    return max(dp)

### Unique Paths in a Grid Given a grid of size m x n, where you are starting at the top-left corner and your goal is to reach the bottom-right corner. You can move either down or right at any point in time.

Code:

python
def unique_paths_in_grid(m: int, n: int) -> int:
    if m == 0 or n == 0:
        return 0
    dp = [[1 for _ in range(n)] for _ in range(m)]
    for i in range(1, m):
        for j in range(1, n):
            dp[i][j] = dp[i-1][j] + dp[i][j-1]
    return dp[-1][-1]

### Ways to Decode

A message containing letters from A - Z can be encoded into numbers using the following mapping: 'A' -> 1, 'B' -> 2, ... 'Z' -> 26. Given a string s containing only digits, return the number of ways to decode it.

Code:

python
def num_ways_to_decode(s: str) -> int:
    if not s:
        return 0
    n = len(s)
    dp = [0] * (n + 1)
    dp[0] = 1
    dp[1] = 1 if s[0] != '0' else 0
    for i in range(2, n + 1):
        if s[i-1] != '0':
            dp[i] += dp[i-1]
        if s[i-2] == '1' or (s[i-2] == '2' and s[i-1] <= '6'):
            dp[i] += dp[i-2]
    return dp[-1]

### Best Time to Buy and Sell Stocks II Say you have an array `prices` for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit with the ability to complete as many transactions as you like.

Code:

python
def max_profit(prices: List[int]) -> int:
    n = len(prices)
    if n == 0:
        return 0
    dp = [0] * n
    for i in range(1, n):
        if prices[i] > prices[i-1]:
            dp[i] = dp[i-1] + prices[i] - prices[i-1]
        else:
            dp[i] = dp[i-1]
    return dp[-1]

### Best Time to Buy and Sell Stocks III

Say you have an array `prices` for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete at most two transactions.

Code:

python
def max_profit_2_transactions(prices: List[int]) -> int:
    n = len(prices)
    if n == 0:
        return 0
    dp_left = [0] * n
    dp_right = [0] * n
    min_price = prices[0]
    for i in range(1, n):
        min_price = min(min_price, prices[i])
        dp_left[i] = max(dp_left[i-1], prices[i] - min_price)
    max_price = prices[-1]
    for i in reversed(range(n-1)):
        max_price = max(max_price, prices[i])
        dp_right[i] = max(dp_right[i+1], max_price - prices[i])
    res = 0
    for i in range(n):
        res = max(res, dp_left[i] + dp_right[i])
    return res

### Best Time to Buy and Sell Stocks

Say you have an array `prices` for which the ith element is the price of a given stock on day i. If you were only permitted to complete a single transaction (i.e., buy one and sell one share of the stock), design an algorithm to find the maximum profit.

Code:

python
def max_profit_single_transaction(prices: List[int]) -> int:
   n = len(prices)
   if n == 0:
        return 0
   dp = [0] * n
   min_price = prices[0]
   for i in range(1, n):
        min_price = min(min_price, prices[i])
        dp[i] = max(dp[i-1], prices[i] - min_price)
   return dp[-1]

### Regular Expression Match

Implement wildcard pattern matching with support for '?' and '*'. '?' Matches any single character. '*' Matches any sequence of characters (including the empty sequence).

Code:

python
def is_match(s: str, p: str) -> bool:
        m, n = len(s), len(p)
        dp = [[False] * (n + 1) for _ in range(m + 1)]
        dp[0][0] = True
        for i in range(1, n + 1):
            if p[i - 1] == '*':
                dp[0][i] = dp[0][i - 1]
        for i in range(1, m + 1):
            for j in range(1, n + 1):
                if p[j - 1] in {s[i - 1], '?'}:
                    dp[i][j] = dp[i - 1][j - 1]
                elif p[j - 1] == '*':
                    dp[i][j] = dp[i][j - 1] or dp[i - 1][j]
        return dp[-1][-1]

### Regular Expression II

Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element.

Code:

python
def is_match(s: str, p: str) -> bool:
    m, n = len(s), len(p)
    dp = [[False] * (n + 1) for _ in range(m + 1)]
    dp[0][0] = True
    for i in range(1, n + 1):
        if p[i - 1] == '*':
            dp[0][i] = dp[0][i - 2]
    for i in range(1, m + 1):
        for j in range(1, n + 1):
            if s[i - 1] == p[j - 1] or p[j - 1] == '.':
                dp[i][j] = dp[i - 1][j - 1]
            elif p[j - 1] == '*':
                dp[i][j] = dp[i][j - 2] or (s[i - 1] == p[j - 2] or p[j - 2] == '.') and dp[i - 1][j]
    return dp[-1][-1]

### Add Two Numbers as Lists

You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order, and each of their nodes contains a single digit. Add the two numbers and return the sum as a linked list.

Code:

python
class ListNode:
    def __init__(self, val=0, next=None):
        self.val = val
        self.next = next

def add_two_numbers(l1: ListNode, l2: ListNode) -> ListNode:
    dummy = ListNode()
    cur = dummy
    carry = 0
    while l1 or l2 or carry:
        val = (l1.val if l1 else 0) + (l2.val if l2 else 0) + carry
        carry = val // 10
        val %= 10
        cur.next = ListNode(val)
        cur = cur.next
        l1 = l1.next if l1 else None
        l2 = l2.next if l2 else None
    return dummy.next

### Reverse Link List II

Reverse a linked list from position m to n. Do it in-place and in one-pass.

Code:

python
class ListNode:
    def __init__(self, x):
        self.val = x
        self.next = None

def reverse_between(head: ListNode, m: int, n: int) -> ListNode:
    dummy = ListNode(-1)
    dummy.next = head
    pre = dummy
    for i in range(m - 1):
        pre = pre.next
    cur = pre.next
    for i in range(n - m):
        temp = pre.next
        pre.next = cur.next
        cur.next = cur.next.next
        pre.next.next = temp
    return dummy.next

Tips for Facebook Interview Preparation

Preparing for a Facebook Interview? The following tips will help you make the most out of your preparation:

  • Familiarize Yourself with Core Values: Facebook has five core values: move quickly, be bold, focus on impact, be open, and build social value. It is important to understand and keep in mind these values, especially during the behavioral interview, and to be honest about both successes and failures.
  • Keep it Simple: During the design interviews, break down the problem and then simplify it for the interviewer. This saves time and helps to focus on the most important aspects of the problem. Thinking about how you would design solutions at Facebook can be a good starting point.
  • Be Efficient: During coding interviews, plan accordingly to prevent running out of time. Use the programming language that you are most comfortable with, and take a few minutes to think before beginning to code and choose the most optimal solution. Efficiency is key.

Good Luck!

Facebook Job Interview FAQs

Here are the answers to some frequently asked questions about job interviews at Facebook:

How many rounds of interviews does Facebook have?

Facebook conducts around 6-7 rounds of interviews that typically include phone screenings (2 rounds) and algorithm and data structure interviews (4-5 rounds).

What are the different levels of software engineers at Facebook?

There are six levels of software engineer titles at Facebook:

  • Software Engineer Level I (E3)
  • Software Engineer Level II (E4)
  • Software Engineer Level III (E5)
  • Software Engineer Level IV (E6)
  • Software Engineer Level V (E7)
  • Software Engineer Level VI (E8)

However, all engineers regardless of level are called "software engineers" at Facebook.

Why do you want to work at Facebook?

When answering this common interview question, be specific about your interests and what kinds of work you want to do at the company. Talk about Facebook's specific products that interest you.

Is Python allowed in coding interviews? Which programming language is used in a Facebook interview?

Yes, you are free to use any programming language, including Python, in a Facebook coding interview.

How can I get a job at Facebook?

You can check out the Facebook careers page for job openings in any of the company's locations. Filter by category, role, and location to find positions that match your skillset and interests. The screening and interview process can take up to approximately 90 days. You can apply for up to three job positions after a gap of 90 days each. Start preparing for interviews after resume shortlisting.

What are the benefits of working at Facebook?

Facebook offers competitive salaries and the opportunity to work on building a product that millions of people use every day. Working at Facebook is an enriching experience for many.

What mistakes should I avoid during a Facebook interview?

Make sure to avoid appearing underconfident and follow the tips given above while preparing for your Facebook interview.

Technical Interview Guides

Here are guides for technical interviews, categorized from introductory to advanced levels.

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Best MCQ

As part of their written examination, numerous tech companies necessitate candidates to complete multiple-choice questions (MCQs) assessing their technical aptitude.

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