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.
"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 a prompt processing backend
Design a prompt processing backend System Design: Background Processing Backend for LLM Prompts Context Design a multi-tenant backend that processes l...
Explain arrays and memory layout
What is an array? How is an array represented in memory (contiguous layout, element size and alignment, indexing arithmetic). Analyze time complexitie...
Describe a project you are proud of
Prompt Spend ~30 minutes walking the interviewer through a software project you are proud of. What to cover - Problem & context: What was the user/bus...
Schedule batched register operations optimally
Problem You are given a text file that describes batches of register operations (reads and writes) on integer-indexed registers. Your task is to sched...
Debug missing output in Python async HTTP flow
You are given a Python program intended to call two HTTP APIs in order, process the returned JSON, and finally print the computed result. However, whe...
Convert binary tree traversals to forest count
A binary tree has the following traversals: - Inorder: A, B, C, D, E, F, G - Postorder: B, D, C, A, F, G, E This binary tree is converted to an equiva...
Implement a balance tracker and interval merger
This screening contained two coding exercises. Part 1: Driver balance tracker You are building an in-memory ledger for a delivery platform. Each updat...
Implement encode/decode for list of strings
You are given a list of strings (may include digits and symbols). Implement two methods: - encode(List<String> input) -> String: converts the list int...
Design an in-memory cloud file system
In-Memory Cloud File System (OOD) Design an in-memory cloud file system that supports files owned by users with storage quotas. Data model / rules - E...
Implement a search autocomplete suggestion service
Design an autocomplete component that suggests the most relevant search phrases as a user types. You are given historical sentences with their usage c...
Determine escape path with blockers and spreading fire
You are given a 2D grid representing a grassland. - Each cell is one of: - S: start - T: target - .: free cell - #: blocked cell (cannot enter...
Delete nodes in linked list and binary tree
You are asked to solve two short coding tasks. You may assume standard node definitions: - Singly linked list node: val, next - Binary tree node: val,...
Implement task queue with insert, delete, execute
Problem: Task manager with insert/delete/execute-next Design a data structure to manage executable tasks. Each task has: - taskId (unique) - priority ...
Solve string grouping and tree right-view problems
Problem 1: Group words that are anagrams You are given an array of strings words. Two strings are anagrams if they contain the same characters with th...
Explain iOS ARC and avoid retain cycles
iOS Memory Management (ARC) You have 10 minutes to explain iOS memory management under ARC. Cover the following: 1. How ARC manages object lifetime (w...
Implement a single-thread task scheduler API
Design and implement a simple task scheduler for a single CPU, single thread environment. You need to support scheduling callbacks (tasks) using the f...
Implement LRU/LFU cache with custom eviction
You are asked to implement an in-memory key-value cache with a fixed capacity. When the cache is full and a new item must be inserted, an eviction pol...
Solve Matrix, Tree, Nested, LCA, Maze Tasks
Answer the following independent coding tasks. For each task, implement a clean API, handle edge cases, and analyze time and space complexity. 1. Trav...
Design a URL shortening service
Design a URL shortening service similar to TinyURL. Requirements Functional - Create a short URL for a given long URL. - Redirect: given a short code,...
Find cheapest flight with at most K stops
Problem You are given a directed weighted graph representing flights between cities. Inputs - An integer n: number of cities, labeled 0..n-1. - A list...