Graviton Research Capital interview experience Real time questions & tips from candidates to crack your interview
Quantitative Analyst
Graviton Research Capital
1 rounds | 3 Coding
problems
Rejected
Interview preparation journey
Journey
The recruiter reached out to me and asked whether I would be interested in this role. So, I applied, and later received an interview call.
I prepared Brainstellar and puzzles from QuantProf, PuzzledQuant, etc.
Application story
The recruiter reached out to me and asked whether I would be interested. I said yes, and 2–3 days later, I received a link for Round 1 of the interview. It did not go well, so I could not progress to Round 2.
Why selected/rejected for the role?
Rejected. It did not go well, so I could not progress to Round 2. My preparation was not up to the mark.
Preparation
Duration: 1 months
Topics: Puzzles, Probability, Games, Data Structures
Tip 1: Complete all puzzles from Brainstellar.
Tip 2: Cover all fundamentals of probability.
Application process
Where: Other
Eligibility: No criteria, (Salary Package - 55 LPA)
Tip 1: Do not include false information on your resume.
Tip 2: Have some projects on your resume.
Interview rounds
01
Round
Easy
Video Call
Duration60 minutes
Interview date9 Oct 2025
Coding problem3
1. Tiling Problem
Hard
45m average time
0/120
Asked in companies
You have been given a board where there are '2' rows and 'N' columns. You have an infinite supply of 2x1 tiles, and you can place a tile in the following ways:
1. Horizontally as 1x2 tile
2. Vertically as 2x1 tile
Count the number of ways to tile the given board using the available tiles.
Note :
The number of ways might be large so output your answer modulo 10^9 + 7.
Here an example of tile and board for 'N' = 4 :
Problem approach
Answer -> 1 will always remain empty 4^n not divisible by 3 can create grid with only one remaining Induction
1) Base case -> single gird
2) Assuming induction hypothesis , break the grid into 4 parts , fill all parts with 1 missing and put the L shaped tile to get perfect 3/4 of the grid .
Now put the smaller set in the top right to get 1 missing again
2. Prisoner Puzzle
There are 100 prisoners, all isolated. There is a single room with a light bulb (initially OFF).
Prisoners are brought into the room one at a time, in random order.
They can toggle the light (ON/OFF).
They cannot communicate otherwise.
At any time, one prisoner can declare:
“All prisoners have visited the room at least once.”
If correct → all are freed
If wrong → all are executed
How can they guarantee success?
Problem approach
You need a way to count visits indirectly.
Only one prisoner should be responsible for counting.
Others should contribute in a controlled way.
Avoid double-counting!
3. Envelope Paradox
You are given two envelopes. One contains twice as much money as the other.
You pick one envelope at random.
You open it and see ₹X inside.
Now you are given a choice:
Keep it or switch to the other envelope.
Problem approach
Conditional probability
Bayesian reasoning
Hidden assumptions
Here's your problem of the day 
Solving this problem will increase your chance to get selected in this company
Skill covered: Programming
Which SQL keyword removes duplicate records from a result set?
Choose another skill to practice
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