C3 Energy

www.c3energy.com
Engaged Employer

# C3 Energy Interview Questions

16 Interview Reviews

71%
21%
7%

53%
30%
15%

3.6
Average

Hard

Average

Easy

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## Candidate Interview Reviews

Sort: Popular Date Difficulty

## Data Scientist Interview

No Offer
Neutral Experience
Difficult Interview

Application

I applied online. I interviewed at C3 Energy in March 2015.

Interview

I applied online, and got an invite the very next day, I had to solve three programming assignment in 1 hours.You can choose the programming language that you are comfortable with.

Interview Questions

2.

## Software Engineer In Test Interview

No Offer
Positive Experience
Easy Interview

Application

I applied online. The process took 3 weeks. I interviewed at C3 Energy (Mountain View, CA) in August 2014.

Interview

After a conversation with HR, A fairly simple technical interview, which will again be followed by an on-site or a round of Skype interviews if the candidate is not local. All questions were simple.Very friendly interviewers.

Interview Questions

• Write a function to decode roman numerals. Give test cases to test your code. M=1000 D=500 C=100 L=50 X=10 V=5 I=1 III=3 VI=6 VIII=8 III X = 7 VVVX = -5 MCMLXXII = 1972 MCMXXXCII = 1972 CCCXLV = 345 MDCLXVI = 1666   1 Answer
• // Merge 2 2-dimensional arrays into one 2-dimensional array. // example input: // { 1, 2, 3; // 4, 5, 6} // { 7, 8, 9; // 10, 11, 12; // 13, 14, 15} // example output: // { 1, 2, 3; // 4, 5, 6; // 7, 8, 9; // 10, 11, 12; // 13, 14, 15}   1 Answer
3.

## Software Engineer Interview

No Offer
Positive Experience
Difficult Interview

Application

I applied online. The process took 1 day. I interviewed at C3 Energy (Santa Clara, CA) in June 2014.

Interview

I applied online and it took one day! Then I took a online test. I was too naive to think the online test is a really easy one. It turned out that it was quite hard. They didn't provide me with the signature of the function and I need to figure it out by myself. What's more, it was a one-hour test, which I thought was quite a hurry.

Interview Questions

• change the pointer of the nodes so that all of them can be good nodes.   1 Answer
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5.

## Software Engineer Interview

No Offer
Neutral Experience
Difficult Interview

Application

I applied online. The process took 3 days. I interviewed at C3 Energy in June 2014.

Interview

the first step is the online test, and there are three problems, one is difficult, one is middle, and the last is easy, but time is limited and few people would pass that, I guess. And I failed to pass this online test.The platform uses 3 party website, and the oj system would not check whether your algorithm is good in time complexity.

Interview Questions

• one difficult graph questions, and two other easier problems, but time is limited   Answer Question
6.

## Software Engineer Interview

No Offer

Interview

Applied online, receive a coding challenge. 3 questions in one hour, a little hurry. Did not good, and receive rejection in the night. Good company if you want an interview quickly. And feels like they are really hiring talented people.

Interview Questions

7.

## Executive Assistant Interview

Accepted Offer
Positive Experience
Average Interview

Application

I applied through a recruiter. The process took a week. I interviewed at C3 Energy (Redwood City, CA) in April 2014.

Interview

Everyone was friendly and transparent about the job expectations. I enjoyed meeting a wide range of employees during the process. Some of the interviews were conducted in open, common office areas within ear-shot of other employees - not for the shy! Onboarding went very quickly. You are expected to jump into the work and do more than 100%.

8.

## Software Engineer Interview

No Offer
Neutral Experience

Application

I applied online. I interviewed at C3 Energy.

Interview

Applied through career site and after few weeks got a reply from them for a coding exam. There are 3 questions: search element in tree, find a sum in array by adding two number in array. After that I was scheduled for skype interview. Skype was another technical interview. find different keys in a n*n array from each position and key should be of length 5.

## Data Engineer Interview

No Offer
Positive Experience
Difficult Interview

Application

I applied through a recruiter. The process took 3 weeks. I interviewed at C3 Energy (Redwood City, CA).

Interview

Overall, a good experience. Started with an interviewstreet.com programming test (rather hard for one hour if problems are unfamiliar), then interactive coding over Skype, then an on-site with four people who all asked different types of whiteboard puzzles. Final interview is with managers and eventually the CEO.

Interview Questions

• Be ready for mathematical formulation questions. Whiteboard coding is a must. The culture is more buttoned-down than the typical jeans-and-tshirt tech startup.   Answer Question
10.

## Software Engineer New Grad Interview

No Offer
Positive Experience
Difficult Interview

Application

I applied online. The process took 2 days. I interviewed at C3 Energy in February 2014.

Interview

The first round was an online test ( a hour and a half ) There was an online compiler with test cases. the second round was a phone interview where I was asked to solve a problem

Interview Questions

• Generate all possible lock combinations on an android lock screen of length 5 such that each numbers are adjacent to each other and no repetitions within a combination.   1 Answer

## Data Scientist Interview

No Offer

Interview

On-campus recruiting interview. Had to meet up with them in a room on campus. Mainly technical (about an hour in length), some basic questions involving system/model estimation and some machine learning techniques. I was mainly writing on the white board and at one point ended up deriving the general form for solving a linear least squares problem. Interviewer seemed interested in seeing how deep my knowledge of the material went.

Interview Questions

• What is PCA/Singular Value Decomposition and can you derive why it works?   Answer Question
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