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Interview Process   |   Interview Puzzles / Aptitude
Organization : Yelp
Position : Software Engineer

Yelp Interview Process

I applied at Yelp for the post of Software Engineer through an online application. My interview process at Yelp had six rounds in total - one telephonic screening, one telephonic interview and four face to face interviews. The entire process took more than four weeks.

Round 1 - Telephonic Screening
After applying, I was called by the HR for the basic screening. All questions were pretty basic and for most of the time, I was simply telling her about myself and my education. After this screening, she informed me about a telephonic interview with an engineer.

Round 2 - Telephonic Interview
After the initial screening, it was now time for an interview over phone with an engineer. Many questions were asked. Though most of them were basics, some very really good questions. My interviewer was quite friendly and I never felt any pressure over my shoulders during that interview. Some of the questions that were asked:
Q1. If in Java, two objects reference each other, will they be garbage collected?
Q2. How will you improve the performance of a website?
Q3. Questions of Pascal triangle.
Q4. Anagram sort for a huge list of words that don't fit in memory.

Round 3 - First On-Site Interview
After I got through the Telephonic Interview, I was called for my first on-site interview. This first round began with questions about myself and then picked up a bit asking java based basic questions.
Q1. If we add more indexes to a database, will it improve the performance?
Q2. Given a string, find the longest string with unique characters.

Round 4 - Second On-Site Interview
This technical interview was pretty much similar to the previous one except for the fact that some other official was sitting in front of me.
Q1. Why do you want to join Yelp?
Q2. If you are given a list of urls, how will you find the top five most visited urls?

Round 5 - Third On-Site Interview
This technical round was a bit difficult than all the previous rounds. The technical questions now became complex as the interview progressed. This round will very much decide your fate as only the serious candidates who have prepared well will be able to get through with it.
Q1. Implement the 'cd' command i.e. given a function cd('a/b','c/../d/e/../f'), where 1st param is current directory and 2nd param is the sequence of operations, find the final directory that the user will be in when the cd command is executed
Q2. Questions on anagram sort.
Q3. Database structures related questions.

Round 6 - Fourth On-Site Interview
This interview was more focused on behavior related questions and HR based questions. However still there were some technical questions asked to me.
Q1. Why do you chose Yelp over other companies?
Q2. How will you help in the growth of Yelp?
Q3. Implement Regex.

How to crack (get into) Yelp Interview

The interview process at Yelp is comparatively longer and difficult than other competing companies. This is what I felt during my interview. After the initial screening, the level of difficulty started increasing and the on-site interviews were something that you can't crack without giving hard efforts. Even the telephonic interview was pretty good.

I have explained and even given out the topics or questions that were asked to me in my interviews which you can consider as pointers towards what you should expect from your interview at Yelp.

They require smart and professional people and they will judge you on the same terms. Knowledge can be possessed by many but not all people are quite smart to impress them. The key is your confidence level and the approach that pushes you towards your goal. Just try to solve any code or any problem given by them and give your best shot. If they feel that you don't give up easily, they will admire you for sure. But of course, you should work really hard to make your first impression as someone who is thoroughly clear with all the basic terms and fundamentals.

With that, I would say that my best wishes are with you all. The company is great and you w ill love working here.

Thanks Anmol for sharing the details of your interview.
Send more details and your personal experiences info@gpuzzles.com
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Hard Logic Puzzle

A great meeting is held by a great logician where all the other logicians are called upon. The master logician takes them in a room and makes them sit in circle. A hat is placed on each of their heads. Now all of them can see the color of hats others are wearing but can’t see his own. They are told that there different colors of hats.

The master logician explains that a bell will be rung at regular intervals and the moment when a logician knows the color of his hat, he will leave on the next bell. If anyone leaves at the wrong bell, he will be disqualified and sent home.

All of them are assured of one thing that the puzzle will not be impossible for anyone of them. How will they manage the situation?

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Weight Balance Riddle

You can place weights on both side of weighing balance and you need to measure all weights between 1 and 1000. For example if you have weights 1 and 3,now you can measure 1,3 and 4 like earlier case, and also you can measure 2,by placing 3 on one side and 1 on the side which contain the substance to be weighed. So question again is how many minimum weights and of what denominations you need to measure all weights from 1kg to 1000kg.

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Interview Marble Logic Puzzle

You are given a set of scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables you to conclude either that the contents of the dishes weigh the same or that the dish that falls lower has heavier contents than the other.
The 12 marbles appear to be identical. In fact, 11 of them are identical, and one is of a different weight. Your task is to identify the unusual marble and discard it. You are allowed to use the scales three times if you wish, but no more.

Note that the unusual marble may be heavier or lighter than the others. You are asked to both identify it and determine whether it is heavy or light.

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Riddle 1 - 1 !=3

Can you move four matchsticks to make the equation true?

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Be Detective And Find The Thief Puzzle

You need to be a detective and need to find the thief in the puzzle below?

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Hard Logic Statement Riddle

There are a hundred statements.
1st person says: At least one of the statements is incorrect.
2nd person says: At least two of the statements is incorrect.
3rd person says: At least three of the statements are incorrect.
4th person says: At least four of the statements are incorrect.
100th person says: At least a hundred of the statements are incorrect.

Now analyze all the statements and find out how many of them are incorrect and how many are true?

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Logic Fruits Riddle

There is a box full of fruits,
all but two are grapes,
all but two are apples,
and all but two are oranges.

How many fruits are in the box ?

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Inspector Montalbano Mystery Puzzle

Before going to work, Inspector Montalbano got into the fight with his wife. After coming back from the work he found out that the police was in the home and his wife had just killed a burglar.
The police told that she killed the burglar in self-defense. She told her husband the story that she heard a doorbell and thought that it was me and as soon as she opened the door, the burglar jumped into her and she was so scared that she killed burglar immediately with the knife. Inspector Montalbano asked the police to arrest her wife for murder conspiracy. Why?

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No Death Penalty For Kill Riddle

Ramsay was killed by Sansa in front of everyone but the judge was not sure how to punish Sansa. Why is the judge confused?

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Tricky Math Race Riddle

Rooney, Hernandez, and Robin race each other in a 100 meters race. All of them run at a constant speed throughout the race.

Rooney beats Hernandez by 20 meters.
Hernandez beats Robin by 20 meters.

How many meters does Rooney beat Robin by ?

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