Whatnot 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."
Design a Direct Messaging System for an E-commerce Marketplace
This question evaluates a candidate's ability to design a real-time messaging system, covering distributed systems concepts like durability, ordering ...
Design a Charity Donation Website
This question evaluates system architecture and reliability engineering skills, focusing on payment integration, asynchronous processing, idempotency,...
Design A WhatsApp-Style Messaging System
Design a messaging system similar to WhatsApp. Users should send one-to-one and group messages, receive messages in near real time, and recover messag...
Design an Online Coding Judge
Design a large-scale online coding practice and contest platform. Users should be able to browse programming problems, submit code in multiple languag...
Design an Online Coding Contest Platform
This question evaluates a candidate's ability to design a scalable, secure System Design for an online coding contest platform with emphasis on safely...
Content Safety Filter
This coding question tests string parsing, tokenization logic, and pattern-matching algorithm design in a practical content moderation context. It eva...
Propose and Validate a Mobile App Improvement
Assume you are working on a consumer mobile app. Propose one product improvement that could improve user engagement, retention, or conversion. Your an...
Synchronize Shared Data Across Two Lists
Build a small mobile app with two list screens that fetch and display data. Some items may appear in both lists. Each item has at least: - id - title ...
Solve Adjacent-Deletion and Sorted-Square Problems
Solve the following coding problems. Discuss the approach and complexity before implementation. Problem 1: Remove adjacent duplicate pairs Given a str...
Merge Two Sorted Arrays
Merge Two Sorted Arrays Given two integer arrays sorted in nondecreasing order, return a new array containing every value from both inputs in nondecre...
Remove All Adjacent Duplicate Pairs
Remove All Adjacent Duplicate Pairs Given a string s, repeatedly remove pairs of equal adjacent characters. A removal can make a new equal pair adjace...
Knight Dialer: Count Dialable Digit Sequences
This question evaluates a candidate's ability to model constrained state transitions with dynamic programming, using a knight's legal moves on a phone...
Dot Product of Two Vectors (Dense, then Sparse)
This question assesses proficiency in array manipulation and algorithmic efficiency by asking for a vector dot product, first over dense arrays and th...
Count User Journey Prefixes
This question evaluates the ability to reconstruct per-user action sequences from timestamped logs, aggregate and count path prefixes, and apply data-...
Build a Tic-Tac-Toe App
Implement a simple Tic-Tac-Toe mobile app that can be completed in a 45-minute coding interview. Requirements: - Display a 3x3 board. - Support two lo...
Build User Journey Path Summary
Implement a function build_summary(logs) -> str that summarizes user journeys as a trie-like path tree. You are given a list of action logs. Each log ...