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."
Rearrange array to maximize positive prefix sums
Problem You are given an integer array a of length n. You may rearrange the elements in any order. Define the prefix sums of a permutation p as: - pre...
Implement Euclidean distance and k-nearest neighbors
You are working with points in an n-dimensional Euclidean space, where each point is represented as a list (or array) of numeric coordinates. Assume: ...
Design scalable job scheduler and query dashboard
Design a scalable, fault-tolerant job scheduling system. The system should allow clients to schedule background jobs (for example, sending emails or r...
Maximize weighted sum with disjoint adjacent swaps
You are given an integer array arr of length n (0-indexed). Define the weighted sum as: S = Σ_{i=0..n-1} arr[i] * (i + 1). You may perform any number ...
Implement held transfers with accept/cancel
Implement held transfers with accept/cancel Design and implement a two-phase ("pull-style") money-transfer system in which funds are first held on the...
Design large video upload for a YouTube-like app
System Design Prompt Design the video upload subsystem for a YouTube-like product that supports large video files. Core user flow 1. User selects a la...
Find start indices of anagram substrings
You are given two strings: - s: the text string - p: the pattern string Return a list of all starting indices i such that the substring s[i : i + len(...
Scale median under memory constraints
Scale median under memory constraints Design a Scalable Streaming Median Service Under Memory Constraints Context You are building a service that cons...
Generate the next lexicographic array arrangement
Generate the next lexicographic array arrangement Given an integer array nums (which may include negative numbers and duplicates), modify nums in plac...
Answer parity-alternation range queries
You are given an integer array nums of length n and q queries. Each query is a pair [l, r] (0-indexed, inclusive). A subarray nums[l..r] is called alt...
Answer project deep-dive and Why Google questions
Scenario This round is conversational (no coding). The interviewer asks about: - One or more personal projects (deep dive) - Internship experience and...
Design an object-oriented poker game
Design the object-oriented architecture for a command-line poker game. Requirements (clarify and state assumptions) Assume a standard 52-card deck (no...
Implement an expiring counter class
Expiring Counter (sliding time window) Design and implement an expiring counter that counts events in a recent time window. Requirements - You are giv...
Implement a Parallel Image Processor
You are building a batch image-processing utility. Implement a function that receives a list of jobs. Each job contains: - input_path: the source imag...
Solve Triangle Rows and Top Frequencies
You have 1 hour to solve both coding problems. Problem 1: Build an Additive Number Triangle Given an integer numRows, return the first numRows rows of...
Design an hourly call-agent scheduler
Problem You are staffing AI calling agents for a single day in Pacific Time (PT). Each customer must place a required number of outbound calls to thei...
Design an image crawler for unlimited URLs
Design a service that crawls images starting from a set of root URLs. Requirements: - Input: one or more root URLs. - Crawl pages, discover links, and...
Compute top-N posts in a workspace
Design a feature that returns the top-N posts (e.g., Confluence pages/blog posts) in a workspace. Requirements: - Define what “top” means (e.g., views...
Design a tagging system and REST APIs
Design a tagging system (similar to tagging pages/issues) with a strong focus on REST API design. Functional requirements: - Create a tag. - Rename a ...
Reverse last two characters with space
Problem Given a non-empty string s with length at least 2, output a new string consisting of the last two characters of s in reverse order, separated ...