Software Engineer Interview Questions
Practice 4,360 real Software Engineer interview questions for 2026 — real questions from actual interviews with detailed solutions to speed your interview preparation. This collection reflects what top tech firms like Meta, Amazon, Google, DoorDash, and TikTok typically evaluate: rigorous coding and algorithmic problem solving, increasing expectations for end-to-end system design (including GenAI/LLM design at some teams), clear complexity analysis, and reliable engineering judgment under constraints. Expect a multi-stage pipeline: recruiter screen, timed or asynchronous coding assessments, one-to-more live coding rounds focused on data structures and correctness, system-design conversations for mid and senior levels, and behavioral/hiring-manager interviews that probe ownership and collaboration. To prepare, prioritize patterned practice (timed mock interviews and implementation + optimization), learn scalable design frameworks, rehearse concise trade-off communication, and tailor examples to company signals like Amazon’s leadership lens or product/latency focus at delivery and media-driven teams. Consistent, feedback-driven practice that combines problem-solving speed, clean code, and measured design reasoning is the quickest path to offers.
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"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 Scalable Notification System
Design a Scalable Notification System Design a notification service that other internal teams call to deliver messages to users across multiple channe...
Inventory Allocation by Bid Priority
Inventory Allocation by Bid Priority You run a fulfillment system that distributes a limited pool of identical items among competing customer requests...
Reconstruct the Alphabet Order of an Alien Language
Reconstruct the Alphabet Order of an Alien Language A research team has intercepted a list of words written in an alien language. The words use lowerc...
Solve friend recommendations and time-versioned maps
Solve the following two coding problems. Problem 1: Friend recommendation from weighted likes You are given a directed weighted graph of users. Each r...
Implement an In-Memory Query Engine
Implement a small in-memory query engine for tabular data. You are given one or more tables. Each table has: - A table name - A list of column names -...
Find Shortest Covering Substring
Given two strings source and target, find the shortest contiguous substring of source that contains every character from target, including duplicate o...
Solve Tree Columns And Maze Variants
Answer the following coding tasks from the interview. 1. Binary-tree column grouping: Given the root of a binary tree, group node values by vertical c...
Implement Store Autocomplete
You are given a list of store names, for example: `text ["McDonald's", "KFC", "Burger king", "Bites", "Biscuit shop"] ` Implement an autoComplete(s) m...
Evaluate an Arithmetic Expression
Implement an expression evaluator for a simplified calculator. Given a string s, return the integer value of the expression. The expression may contai...
Solve Array Merge and Parentheses Cleanup
You are asked to solve two coding problems. Problem 1: Merge Three Sorted Arrays Given three integer arrays, each sorted in nondecreasing order, merge...
Implement Cache, Undo, and DFS
Answer the following independent coding prompts. 1. Timed cache: Implement a generic in-memory cache. Each inserted item has a fixed expiration time k...
Solve Tree View and Triplet Sum
You are asked to solve two coding problems. Problem 1: Return the nodes visible from the right Given the root of a binary tree, return the values of t...
Find the First Unique IP
You are processing a chronological stream of server hit records. Each record contains an IP address as a string. Design and implement a component that...
Maximize Chef Assignment Profit
You are given three integer arrays: - chefSkill[i]: the skill level of the i-th chef. - dishDifficulty[j]: the difficulty level required to cook the j...
Compute Courier Delivery Pay
A delivery platform has a service that can return all orders delivered by a courier. You are given: - courierId: the courier's identifier. - ratePerMi...
Implement obstacle-course run statistics
You are given a TypeScript codebase for tracking race results on an obstacle course. - A Course has a fixed number of obstacles. - A Run stores the ti...
Implement an LRU Cache
Design and implement a fixed-capacity key-value cache that evicts the least recently used item when it becomes full. Support the following operations:...
Build a File-Backed Key-Value Store
Implement a persistent key-value store that supports the following operations for string keys and string values: - put(key, value) - get(key) - delete...
Implement Interval Insert and Dedup
This interview round contained two coding problems: 1. Insert and merge intervals. You are given a list of non-overlapping intervals sorted by start t...
Find Dictionary Matches for a Jammed String
You are given: - a dictionary of lowercase words - an input string jammed_string A keyboard may be stuck, so when typing an original word, any charact...