Hudson River Trading Software Engineer Interview Questions
Practice the exact questions companies are asking right now.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Explain Large Memory Allocation, Swap, and C++ Inline Trade-offs
In a low-level C++ interview, explain what happens when a program requests 8 GB of memory on a machine with 4 GB of RAM, and discuss the purpose and d...
Design an Indexable Deque with O(1) Access
Design a data structure backed by a deque that supports push front, push back, pop front, pop back, and O(1) access by logical index. Explain how an o...
Choose Mean or Median for Trading Profit Metrics
A trading firm observes daily profit values X_1 through X_n and wants a metric for average performance. In an interview, you must choose between mean ...
Find a Local Minimum in One and Two Dimensions
Given an array of unique numbers, return any element that is smaller than its neighbors. Then discuss the two-dimensional follow-up where you need to ...
Count Matrix Cells Whose Row and Column Neighbors Match
Given a matrix, count how many cells have the property that every other value in the same row and every other value in the same column are all equal t...
Explain C++ Inline, Segfaults, Virtual Memory, and std::string Internals
Answer a C++ systems interview covering inline functions and inline variables, segmentation faults, MMU address translation, TLB and page tables, page...
Wrap a Fixed-Chunk Stream Reader with Arbitrary-Length Reads
You are given a low-level stream API that reads exactly 4096 bytes at a time. Design a wrapper API read(n) that returns any requested number of bytes,...
Find the Longest Common Digit Prefix Across Two Arrays
Given two arrays of positive integers, convert each integer to its decimal string representation and find the maximum length of a common prefix betwee...
Minimize Array Amplitude After Removing a Contiguous Block
Given an array of integers and an integer K, remove exactly K contiguous elements so that the amplitude of the remaining array, defined as max(remaini...
Design Insert/Delete/GetRandom with Weighted Sampling
Design a data structure that supports inserting values, deleting values, and returning a random value. Then extend it so each inserted value has a wei...
Split a Message into Length-Limited Parts with Numbered Suffixes
Given a message string and a length limit, split the message into ordered parts. Each part must end with a suffix like <X/Y>, where X is the 1-based p...
Calculate Completion Time for a Single-Server Reactor Queue
A laboratory has one molecular reactor. Each accepted sample takes exactly 5 minutes to process. Samples arrive throughout the day at integer timestam...
Count Digit-Reversal Equivalent Pairs
Define flipdigits(x) as the integer produced by reversing the decimal digits of non-negative integer x and removing leading zeroes from the reversed r...
Simulate Alternating Stick Collection for a Nest
A bird is building a nest in a forest represented by an array forest. Positive integers are sticks, where the integer value is the stick length. Zeroe...
Design comprehensive OA test cases
Designing Your Own Test Cases in an Online Assessment Context You are taking a timed technical online assessment (OA) for a software engineering role....
Test easy–medium array/string tasks
For typical easy–medium array and string problems, list the most important edge cases you would test (e.g., empty input, single element, duplicates, a...
Implement Wordle-style word guessing solver
Implement Wordle-style word guessing solver Implement a program to solve a Wordle-style word guessing game. The game has a hidden target word of fixed...
Approach verbose data-structure design
For a data-structure design problem whose behavior is easy to understand but whose implementation is lengthy, describe your step-by-step approach: cla...
Count Length-3 Chat Substrings with a Vowel
You are developing an automatic moderation system for a chat application that detects simple linguistic patterns. Given a string chatMessage, count ho...