Blackrock Interview Experience for Data-Scientist Intern FMG Role - On Campus
Question Details
Blackrock visited our campus for a recruitment drive, providing an exciting opportunity for students to showcase their skills and secure positions in their esteemed organi...
Full Details
Blackrock visited our campus for a recruitment drive, providing an exciting opportunity for students to showcase their skills and secure positions in their esteemed organization. Round 1(110 minutes): The first round comprised of 5 sections where most of the sections were related to aptitude and technical. In technical MCQs, DSA and algorithms were mainly focused. The duration of the test was 110minutes. Round 2(Technical 40-50minutes): What is the const keyword in c++? How do you implement a const member function? Implement a const member function to change the data of a variable? Some questions in depth related to const and static keyword? Find pairs in an array such that their sum is equal to k? (constraints were not to use hashmap to solve the problem). I gave a solution by sorting an array and solved the problem using two pointer approach. Difference between abstract and interface? Real-life examples of abstract class and interface? Some questions related to object-oriented programming Round 3(Technical 40-50minutes): What is the linear regression? How to reduce errors in linear regression and some discussion on it? What is the difference between list and vector in c++? Can you explain how vector works internally? What is the smart pointer in c++? Write a code to find is array A is a subset of array B? I used hashmaps to solve the solution in o(n) time. Write a code to insert an element in the data structure, such that on insertion it deletes all the elements/numbers greater than it? I gave a stack-based solution Solve the Ant and triangle puzzle. Round 4(HR 20minutes): Discussion about projects in my resume for about 10minutes. He was focused on team-based projects and how did I tackle the problems to come up with the best solution. Why Blackrock? Flexible to different locations?
Verdict selected
About This Question
This is a reported interview question from a blackrock interview for a swe role (intern level) during the phone screen round reported in 2025.
It covers the following topics: Two Pointers, Oop, Arrays, Stack Queue, Sorting, Hash Table, Stack .
More BlackRock Interview Questions
About BlackRock Interview Reports
This question was reported by a candidate who interviewed at BlackRock. LeakCode aggregates interview reports from 10+ sources, including 1Point3Acres, Glassdoor, LeetCode Discuss, Blind, Reddit, Indeed, and Nowcoder. Each report is translated where necessary, deduplicated against existing entries, and tagged by company, role, round type, and reporting date.
Use this question as one calibration data point, not a memorization target. Companies typically rotate their question pools every 2-4 months; the exact wording of a 2024 question may differ from what you encounter today. The underlying pattern, difficulty level, and follow-up depth at BlackRock are the higher-signal extractions to take from this report.
For broader preparation context, the BlackRock interview process typically includes a recruiter screen, one or two technical phone screens, and a 4-5 round on-site loop covering coding, system design (at L4+ levels), and behavioral. Reports tagged on LeakCode show the round-by-round distribution and typical difficulty calibration. To browse questions filtered by round type and seniority, use the company hub linked above.
How To Practice This Type of Question
Solve similar problems on LeetCode under timed conditions (25-35 minutes per medium difficulty). The goal is pattern recognition: recognize the underlying technique (sliding window, two-pointer, BFS, memoized recursion, etc.) within 60-90 seconds of reading. Strong candidates verbalize their hypothesis out loud before coding, then iterate based on feedback. Weak candidates dive into implementation immediately, lose time on the wrong approach, and run out of time for follow-ups.
Companies update their question pools every 2-4 months. The exact wording of any given question may have been retired by the time you interview. Focus your prep on the pattern, not the specific problem. The patterns that appear in BlackRock reports consistently are the ones worth investing in; one-off niche problems are not.
During Your BlackRock Round
Apply the standard interview round template: clarify requirements (2-3 minutes), state your approach out loud and confirm direction with the interviewer (3-5 minutes), code with narration (15-25 minutes), test with concrete examples including edge cases (5 minutes), discuss optimization or trade-offs if time permits (5 minutes). This template is universally accepted across FAANG and adjacent companies; deviating from it produces weaker interviewer feedback signal.
The single most predictive failure mode in BlackRock reports tagged "no hire": not asking clarifying questions. Interviewers are explicitly trained to weight this. Strong candidates ask 3-5 clarifying questions even on problems that look obvious; weak candidates dive into code immediately. The clarifying-question check is often the first signal recorded in the interviewer's written notes.