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"
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"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."
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"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."
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"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."
Implement deposit, withdraw, and transfer in a class
Problem Implement a class AccountService that supports basic money operations on accounts. Operations - deposit(accountId, amount) - withdraw(accountI...
Compute exclusive execution time from logs
Problem You are given execution logs from a single-threaded CPU that runs n functions labeled 0..n-1. The CPU can run only one function at a time. A f...
Implement a CSAT Sliding Window Tracker
Design and implement a class that tracks customer satisfaction scores over a sliding time window. A customer support conversation has: - conversation_...
Group GPUs by node and partition by links
Problem: GPU graph grouping and link-maximizing partition You are given a cluster of GPUs represented as a graph: - Each GPU has a unique gpuId and be...
Scale Game of Life to huge matrices
You are given starter code for computing one step of a Game of Life–style cellular automaton on a binary grid, but the naive implementation loads the ...
Find Minimum Rooms Needed
You are given a list of meeting intervals, where each interval is represented as [start, end) and start < end. Two meetings conflict if their time ran...
Make a Parentheses String Valid
Given a string s containing lowercase English letters and the characters '(' and ')', remove the minimum number of parentheses so that the resulting s...
Debug and Explain Fixes
Given a small codebase with failing unit tests, identify the root causes of the failures, fix the bugs, and explain the defects you found. Add minimal...
Merge intervals and design rating APIs
Problem 1: Merge overlapping intervals You are given a list of closed intervals intervals, where intervals[i] = [start_i, end_i] and start_i <= end_i....
Find minimum moves to solve the 15-puzzle
Problem Given a 4×4 sliding puzzle (the classic 15-puzzle), compute the minimum number of moves required to reach the solved state, or return -1 if it...
Compute sums and max path in N-ary tree
You are given the root of an N-ary tree (each node can have 0..k children). Implement the Node class yourself. Assume each node stores an integer valu...
Implement an in-memory key-field-value DB with TTL
In-Memory DB with TTL + Scan + Backup/Restore Implement an in-memory database storing records by (key, field) -> value with optional TTL. Data model /...
Implement Task Management and Duplicate Detection
You are given two independent coding tasks from a software engineering interview. Task 1: Build an in-memory task management system Implement an in-me...
Implement a Coin-Constrained Jump Strategy
You are implementing an autopilot strategy for a simple side-scrolling jump game. A character moves forward automatically. On each game tick, your str...
Find longest substring with ≥k repeats
Problem You are given: - a string s (consisting of lowercase English letters), and - an integer k. Return the length of the longest contiguous substri...
Remove Repeated Character Groups
You are given a string s and an integer k. Repeatedly remove any contiguous group of k identical characters. After a removal, the remaining parts of t...
Implement a multi-level digital recipe manager
Implement a RecipeManager class for a digital recipe manager. The task is progressive (Levels 1–4). You can assume a single-process in-memory implemen...
Calculate trapped water between elevation bars
Given an array of non-negative integers representing the heights of unit-width vertical bars, compute the total water retained after rainfall. Start b...
Implement a ring buffer
Implement a fixed-capacity circular buffer (ring buffer) supporting push, pop, peek, isEmpty, isFull, and size in O( 1) time using an array. Define an...
Merge Weekly Time Intervals
You are given a list of time intervals within a single week. Each time is written as a day-of-week plus a 24-hour clock, for example Sat 13:00 or Mon ...