Software Engineer Coding & Algorithms Interview Questions
Practice 2,306 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."
Maintain top N payers
Implement topNPayers(n) that returns the n accounts with the highest cumulative outgoing payment amounts as strings formatted "{accountId}:{totalOutgo...
Implement a GPU credit manager
Implement a GPU credit manager for a compute cluster. Each user has a nonnegative credit balance that can be increased (grantCredits(user, amount)), c...
Find users with access to all cameras
Given entities and relationships (user, owns, camera), (user, belongs_to, group), (group, owns, camera), and (group, belongs_to, group) where groups c...
Determine reachability and minimum jumps
Given an array of non-negative integers nums of length n, where nums[i] is the maximum number of steps you can move forward from index i: ( 1) Determi...
Recommend movies by shared ratings
Write a function recommendations(user, ratings) that returns a list of movies to recommend to the given user based on shared preferences. Each rating ...
Design a rolling event tracker with ranges
Design a rolling event tracker that supports time-based queries. Implement a data structure with: ( 1) record(timestamp): record one event at integer ...
Explain HashMap internals and collisions
In Java, describe the underlying data structures used by HashMap (e.g., array of buckets, linked lists vs tree bins) and how they evolved across Java ...
Track simulations and report timeouts
You are implementing a monitoring component for many concurrent simulations. Each simulation produces a stream of event objects of the form: - sim_id ...
Validate complete binary tree
You are given the root of a binary tree. A complete binary tree is defined as a binary tree in which: 1. Every level, except possibly the last, is com...
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...
Compute max-ons and deletion indices
Question Given a circular array of n computers represented by 0 (off) and 1 (on), determine the maximum possible number of on computers within any con...
Solve linked-list and top-K algorithm tasks
Question Given a singly linked list, return the k-th node counted from the end. Given an integer array, return the top k most frequent numbers. Given ...
Solve Open the Lock BFS
Question LeetCode 752. Open the Lock – Given an initial lock state "0000", a target combination, and a list of deadend combinations that cannot be use...
Maximize vacation streak with PTO
Question Given an array of characters containing 'w' (workday) and 'h' (holiday) and an integer n representing the number of PTO days you can convert ...
Solve budget queries and shortest path
1) Budgeted purchases with sorted array: You are given an array prices of n positive integers and q budget queries. For each budget B, you may buy ite...
Compute longest palindromic subsequence
Given a string s (1 ≤ |s| ≤ 2000), implement a function that returns the length of the longest subsequence of s that reads the same forward and backwa...
Parse Markdown Links Without Regex
Implement a function that converts simplified link syntax text into an HTML anchor tag <a href="url">text</a> across an entire input string. Constrain...
Describe Java 8 features
What are the key new features introduced in Java 8? Explain when and how you would use lambda expressions, the Stream API, Optional, default methods o...
Design an IP filter using CIDR rules
Explain CIDR notation with a couple of concrete examples. Show how to convert a prefix like 192.168.0.0/16 into an inclusive 32-bit integer range and ...
Implement file word count
Write a function that reads a large text file and returns the frequency count of each word. Define how you will normalize tokens (case, Unicode, punct...