Software Engineer Coding & Algorithms Interview Questions
Practice 2,743 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."
Solve top-K and string rotation match
Solve top-K and string rotation match 1) Given an unsorted array of integers and an integer k, return the k largest elements in descending order. Impl...
Design order stream with state transitions
Design order stream with state transitions Implement an in-memory order stream service with operations: add(order), delete(order_id), pause(order_id),...
Solve two algorithm problems from a menu
Choose two problems from an algorithms menu (arrays, strings, hash maps, graphs). For each: 1) state clarifying assumptions, 2) implement a correct so...
Find k Smallest Pair Sums
This question evaluates skills in algorithm design, working with sorted arrays, pairing and ordering elements, and analyzing time and space complexity...
Design a no-repeat top-frequency music player
Design and implement a music player that receives song lists from new users and returns songs to play in frequency order without repeating a song in t...
Solve array duplicate flags and binary swaps
Problem 1: Flag duplicates on the left and right You are given an integer array nums of length n. For each index i, determine: 1. Left-duplicate: whet...
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...
Implement tiered shipping calculator
Implement tiered shipping calculator Implement in JavaScript a shipping-cost calculator with three progressively richer pricing models based on a conf...
Solve interval deletion and GCD subarray problems
This Amazon online assessment contains two independent algorithm problems. For each, return the requested value, describe an efficient algorithm, and ...
Design a duplicate-file removal algorithm
Design a duplicate-file removal algorithm Your filesystem contains millions of photos. Duplicates are strictly byte-identical files (no ML/CV similari...
Implement a serializable key-value store
Implement in C++ an in-memory key-value store with: - put(key: string, value: string), get(key) -> optional<string>, erase(key). - serialize() -> vect...
Compute shortest delivery route with dangerous stops
Delivery Route Planning With Dangerous Stops You are given delivery stops (nodes) and a set of routes. Each route is a list of stops, and you can trav...
Detect recurring transactions from a ledger
You are given a list of credit/debit card transactions. Each transaction has: - transaction_date (YYYY-MM-DD) - merchant (string) - amount (decimal, p...
Validate an extended tic-tac-toe state
Problem You are given a 3×3 tic-tac-toe board state as an array of 3 strings, each of length 3. Each cell is one of: - 'X' (player X) - 'O' (player O)...
Merge Two Insertion Diffs in Linear Time
A text-editing system represents changes to a document as insertion diffs. An insertion diff is a set of (position, value) pairs, where each pair mean...
Solve restaurant path and order event tasks
You are given two independent coding tasks. Task 1: Shortest paths in a restaurant grid Context: A restaurant is represented as a 2D grid. The waiter ...
Sum numbers formed by root-to-leaf paths
You are given the root of a binary tree where each node contains a single digit from 0 to 9. Each root-to-leaf path represents a number obtained by co...
Parse payroll file and answer queries
You are given a payroll "file" as a StringIO (file-like) object in Python. The underlying text represents manually-entered payroll data. Assume the fo...
Compute trigger counts in a DAG
You are given a directed acyclic graph (DAG) that represents trigger dependencies between tasks. - Each node represents a task. - There is exactly one...
Implement account scheduler with locking and LRU
Design a class AccountScheduler that manages the time-based availability of a fixed set of account IDs. Initialization You are given: - accounts: a li...