Software Engineer Coding & Algorithms Interview Questions
Practice 2,712 real Coding & Algorithms interview questions for Software Engineer roles. From companies including Meta, Amazon, Google, Uber, Microsoft.
"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 crypto trading order control API
You are implementing part of a simple crypto trading system that manages client orders. Each order can be in one of several states: NEW, ACTIVE, PAUSE...
Find LCA in a N-ary tree via DFS
You are given the root of a rooted N-ary tree (each node can have zero or more children) and two distinct nodes p and q that belong to the tree. Desig...
Maximize Unique Characters from Words
You are given a list of lowercase English words. Select a subset of the words such that no character appears more than once across all selected words....
Parse API JSON and print org chart
You will solve two practical coding tasks. Task 1: Call an HTTP API and parse JSON You are given an HTTP endpoint that returns JSON describing transit...
Solve pair-counting and account-merging problems
Problem A — Count qualifying products You are given two integer arrays A and B, and an integer T. For each element a in A, count how many elements b i...
Design body camera checkout system
This question evaluates competency in in-memory data structure design, algorithmic complexity (achieving O(1) average operations), and randomized reso...
Determine Straight Flush
This question evaluates competency in algorithmic pattern detection and data-structure manipulation applied to domain-specific representations, focusi...
Simulate Threshold Grid Infection
This question evaluates understanding of discrete grid-based simulations and local state-transition rules, focusing on modeling infection spread, neig...
Implement a Snapshot Set Iterator
Implement a data structure SnapshotSet<T> with the following interface: `java interface SnapshotSet<T> { void add(T e); void remove(T e); ...
Implement Order Modification Feature
You are given an existing C++ trading system with a client/server architecture. The current system already supports two request types: - AddOrder(orde...
Implement map serialization and deserialization
You are given an in-memory map (dictionary) from strings to strings. Implement two functions: - string serialize(map<string, string> m) - map<string, ...
Debug and Fix Failing Unit Tests in Java
You receive a small Java project for a credit-card rewards service with three failing unit tests: calculatesTriplePointsForRestaurants, returnsUnknown...
Design a nested-list iterator
You are given a nested structure that can contain integers or further lists. Design an iterator over this structure that returns integers in left-to-r...
Implement an expiring GPU-credit manager
Implement an expiring GPU-credit manager for a cloud provider. Each user receives credit grants with an amount and an expiration timestamp. Support: (...
Detect words formed by multiple dictionary parts
Given an array words of up to 100,000 non-empty lowercase strings (total characters ≤ 1,000, 000), return all strings that can be formed by concatenat...
Maintain real-time top-K products from events
Design a data structure/class that ingests a stream of product events and returns the current top‑K products at any time. Events include {timestamp, p...
Compute pipeline order from dependencies
You are given a set of pipelines and a list of directed dependency pairs (A, B) meaning pipeline A depends on pipeline B and therefore B must run befo...
Compute shared free time intervals
You are given schedules for multiple employees. schedules[i] is a list of busy intervals for employee i, where each interval is half-open [start, end)...
Implement a Simulated Memory Allocator
Implement a simulated memory allocator that supports allocate(size) and free(ptr) operations analogous to malloc and free. Treat memory as a contiguou...
Simulate views on an n-ary tree
Given a rooted, ordered n-ary tree (each node has a value and an ordered list of children), simulate an observer who starts at the bottom-left, moves ...