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Facebook Software Developer Interview Questions, Process, and Tips
Top Facebook Software Developer Interview Questions and Answers
- Q1. Saving Money Ninja likes to travel a lot, but at the same time, he wants to save as much money as possible. There are ‘N’ Stations connected by ‘M’ Trains. Each train tha ...read more
- Q2. Longest Increasing Path In A 2D Matrix You have been given a MATRIX of non-negative integers of size N x M where 'N' and 'M' denote the number of rows and columns, respec ...read more
- Q3. Construct Binary Tree From Inorder and Preorder Traversal You have been given the preorder and inorder traversal of a binary tree. Your task is to construct a binary tre ...read more
6 Facebook Software Developer Interview Experiences
30 questions found
Anonymous
I applied via LinkedIn and was interviewed in Jul 2024.
1 Interview Round
HR Round (2 Questions)
- Q1. Why you want to join facebook? View Answers (1)
- Q2. Whats the best feature you like in Facebook? View Answers (1)
1 Interview Round
Coding Test Round
DSA round was there it was good
Get interview-ready with top interview questions
CodingNinjas
I was interviewed in Jul 2021.
4 Interview Rounds
Coding Test Round (2 Questions)
Round duration - 90 minutes
Round difficulty - Hard
This was an online coding round where we had 2 questions to solve under 90 minutes . Both the questions were preety hard according to me . One has to have a fair share of knowledge in Data Structures and Algorithms to pass this round .
- Q1. Longest Increasing Path In A 2D Matrix You have been given a MATRIX of non-negative integers of size N x M where 'N' and 'M' denote the number o...read more View Answers (4)
- Q2. Saving Money Ninja likes to travel a lot, but at the same time, he wants to save as much money as possible. There are ‘N’ Stations connected by ‘M’ Trains. Each...read more View Answers (5)
Video Call Round (2 Questions)
Round duration - 60 Minutes
Round difficulty - Medium
This Round was DS and Algo round and it started with formal introduction, followed by 2 problems. We first dicussed the
approach the time complexity and proper code covering all cases.
- Q1. K - Sum Path In A Binary Tree You are given a binary tree in which each node contains an integer value and a number ‘K’. Your task is to print every path of the...read more View Answers (3)
- Q2. Combination Sum You are given an array/list ARR of N distinct positive integers. You are also given a non-negative integer B. Your task is to find all unique co...read more View Answers (3)
Video Call Round (3 Questions)
Round duration - 50 Minutes
Round difficulty - Medium
This Round was DS/Algo + Core round and it started with formal introduction, followed by 3 problems. We first dicussed
the approach the time complexity and proper code covering all cases for the 2 coding problems . The last question was
related to OS and was a bit theoretical .
- Q1. Accounts Merge You have been given an array/list 'ACCOUNTS' where each element, i.e. ACCOUNTS[i] contains a list of strings, where the first element is ...read more View Answers (4)
- Q2. Construct Binary Tree From Inorder and Preorder Traversal You have been given the preorder and inorder traversal of a binary tree. Your task is to construct a ...read more View Answers (4)
- Q3. OS Question
Explain Demand Paging .
View Answers (2)
Video Call Round (3 Questions)
Round duration - 60 minutes
Round difficulty - Medium
This was a preety intense round as I was grilled more on my System Design concepts but eventually I was able to
asnwers all the questions with some help from the interviewer.
General Tip : While preparing for Facebook Interviews , make sure you read and understand some of the most important features that Facebook incorporates like Graph Search , Adding a friend , Removing a friend , Storing Likes/Dislikes and so on.
All these features are important to learn because at their core they are nothing but Data Structures used and implemented very elegantly . So before your next Facebook interview , do read these topics and be confident about your LLD as well as HLD skills.
- Q1. System Design Question
How does Facebook store likes/dislikes ?
View Answers (2) - Q2. System Design Question
How does Facebook implement graph search ?
View Answers (2) - Q3. System Design Question
How does Facebook Chat works ?
View Answers (2)
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
I was interviewed before Dec 2020.
4 Interview Rounds
Coding Test Round (2 Questions)
Round duration - 90 minutes
Round difficulty - Hard
This was an online coding round where we were supposed to solve 2 questions under 90 minutes . Both the questions in my set were related to Graphs and were quite tricky and heavy to implement.
- Q1. Count Ways You have been given a directed graph of 'V' vertices and 'E' edges. Your task is to count the total number of ways to reach different...read more View Answers (5)
- Q2. Course Schedule II You have been given ‘N’ courses and some courses may have prerequisites. Now consider a matrix ‘PREREQUISITES’ of size 'M' x 2 which ...read more View Answers (3)
Face to Face Round (2 Questions)
Round duration - 60 Minutes
Round difficulty - Medium
This was a Data Structures and Algorithms round with some standard questions . I was expected to come up with an
efficient approach and code it as well .
- Q1. Merge Intervals You are given N number of intervals, where each interval contains two integers denoting the start time and the end time for the interval. The ta...read more View Answers (3)
- Q2. Longest Route You are given a 2-D binary matrix "Mat" of dimensions N x M consisting only of 0s and 1s. The cell consisting of 0 means that the cell i...read more View Answers (2)
Face to Face Round (2 Questions)
Round duration - 50 Minutes
Round difficulty - Medium
This was also a DSA round where I was asked to code only one of the questions but I eventually ended up coding both
as I had some spare time and explained my approches very smoothly to the interviewer . This round went preety well .
- Q1. Longest Increasing Subsequence For a given array with N elements, you need to find the length of the longest subsequence from the array such that all the elemen...read more View Answers (5)
- Q2. Search In Rotated Sorted Array You have been given a sorted array/list ARR consisting of ‘N’ elements. You are also given an integer ‘K’. Now the array is rotat...read more View Answers (3)
Face to Face Round (2 Questions)
Round duration - 50 Minutes
Round difficulty - Medium
This was also a DSA round with 2 questions of Medium to Hard difficulty . I was expected to follow some clean code and OOPS principles to write the code in this round .
- Q1. Rank from Stream You are given an array of ‘N’ integers say ‘ARR’ and provided with other integer say ‘K’. Now you have to find the Rank of ‘ARR[K]’. Note: The ...read more View Answers (2)
- Q2. LRU Cache Implementation Design and implement a data structure for Least Recently Used (LRU) cache to support the following operations: 1. get(key) - Return the...read more View Answers (3)
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
Facebook interview questions for designations
I was interviewed before Dec 2020.
5 Interview Rounds
Face to Face Round (2 Questions)
Round duration - 60 Minutes
Round difficulty - Medium
This was a Data Structures and Algorithms round with preety good questions . I was expected to come up with an efficient approach and code it as well .
- Q1. K Closest Points To Origin Your house is located at the origin of a 2-D plane. You have 'N' neighbours who live at 'N' different points on the p...read more View Answers (3)
- Q2. Power Set You are given a sorted array of 'N' integers. You have to generate the power set for this array where each subset of this power set is individ...read more View Answers (4)
Face to Face Round (2 Questions)
Round duration - 50 Minutes
Round difficulty - Hard
This was also a DSA round where I was asked to code only one of the questions but I eventually ended up coding both as I had some spare time and explained my approches very smoothly to the interviewer . This round went preety well .
- Q1. Roman Numeral To Integer Given a string that represents a roman number. Convert the roman number to an integer and return it. Roman numerals are represented by...read more View Answers (3)
- Q2. Pair Sum You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to return the list of all pairs of elements s...read more View Answers (4)
Face to Face Round (2 Questions)
Round duration - 50 Minutes
Round difficulty - Medium
This was also a DSA round with 2 questions . One was implementation heavy and the other was related to recursion and so I handled it carefully so that my code does not run into TLE or Segmentation Fault.
- Q1. Arithmetic Expression Evaluation You are given a string ‘expression’ consists of characters ‘+’, ‘-’, ‘*’, ‘/’, ‘(‘, ‘)’ and ‘0’ to ‘9’, that represents an Arit...read more View Answers (2)
- Q2. Remove Duplicates from Sorted Array You are given a sorted integer array' ARR' of size 'N'. You need to remove the duplicates from the array suc...read more View Answers (2)
Face to Face Round (2 Questions)
Round duration - 50 Minutes
Round difficulty - Medium
This was a typical System Design round where I was asked about the various features of Facebook and what sort of data structures and algorithms are used in implementing them .
- Q1. System Design Question
How does Facebook store likes/dislikes ?
View Answers (1) - Q2. System Design Question
How does Facebook implement graph search ?
View Answers (1)
Face to Face Round (2 Questions)
Round duration - 50 Minutes
Round difficulty - Medium
This was a preety intense round as I was grilled more on my System Design concepts but eventually I was able to asnwers all the questions with some help from the interviewer.
- Q1. Technical Question
What is Hadoop and why is it used ?
View Answers (1) - Q2. System Design Question
How does Facebook Chat works ?
View Answers (1)
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
Nick White
Top trending discussions
Interview questions from similar companies
I applied via Company Website and was interviewed in Jun 2024.
6 Interview Rounds
Coding Test Round
It was a coding test on Hackerrank with 3 Leetcode easy to medium-level questions.
Technical Round (1 Question)
- Q1. Phone Interview Round - LP-based discussion followed by an easy DSA question. Add Answer
Technical Round (1 Question)
- Q1. Loop Round 1 (Hiring Manager Round) - LP-based discussion followed by a system design question (HLD) which was basically around what the hiring team is working ...read more Add Answer
Technical Round (1 Question)
- Q1. Loop Round 2 (Coding Round) - LP-based discussion followed by a Leetcode medium coding question. Add Answer
Technical Round (1 Question)
- Q1. Loop Round 3 (Coding Round) - LP-based discussion followed by an OOD question which was fairly simple but the requirements were not clarified very well even on ...read more Add Answer
Technical Round (1 Question)
- Q1. Loop Round 4 (Coding Round) (Bar Raiser) - LP-based discussion followed by a Leetcode medium coding question. Add Answer
Interview Preparation Tips
- Data Structures
- Algorithms
- System Design
- Object Oriented Design
- Amazon Leadership Principles
Stay confident.
For System Design and OOD, always clarify the requirements since it's very open-ended and subjective. And do keep an eye on the clock.
2 Interview Rounds
Coding Test Round
BFS Implementation of a jug question.
One-on-one Round (2 Questions)
- Q1. Few hashmap questions Add Answer
- Q2. Object Oriented Programming questions Add Answer
5 Interview Rounds
Coding Test Round
It was a medium-level DSA round
Coding Test Round
This was also a DSA round
Coding Test Round
This again a DSA round
Technical Round (1 Question)
- Q1. Can't disclose the question because of NDA signed but it was a design round Add Answer
One-on-one Round (1 Question)
- Q1. This was a project discussion round Add Answer
PGNVS pranav
1 Interview Round
Coding Test Round
Asked about the dsa questions and about trees
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