Software Engineer Interview Questions
Practice 4,397 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."
Find most frequent log user
Question You are given a list of log entries in string format, where each entry contains a username and an access timestamp separated by a delimiter (...
Parse strings and find meeting slots
Question Given a text file where each line contains raw information, extract the user identifier and the numeric quantity on that line and store the r...
Review Python geodata code
Question You are given a Python codebase that performs geolocation data processing. Conduct a thorough code review: identify readability, correctness,...
Compute minimum passes over permutation
Question You are given an array shelf representing a permutation of the integers 1..n. Starting with target = 1, you repeatedly scan the array left-to...
Randomly partition array into k segments
Question Given a list of integers and an integer k representing the number of segments, write a function that randomly partitions the list into k non-...
Find names similar by one swap
Question LeetCode 859. Buddy Strings – Given a target string and a list of strings, return all list entries that can match the target by swapping at m...
Convert bitmap into ASCII characters
Question Given an array/string of 0-1 bits representing a bitmap font, write code to render each character as a grid using '.' for 0 and '#' for 1, an...
Design Connect-N winner detector
Question Design a data structure for the Connect-N game: pieces are dropped into a column (occupying the lowest empty cell). Implement move(column, pl...
Validate a Binary Tree Built from Directed Edges
Validate a Binary Tree Built from Directed Edges You are given a list of directed edges. Each edge is a pair (parent, child) of positive-integer node ...
Maximum Group of Pairwise Strangers in an Acquaintance Tree
You are given a social network of n people, labeled 0 through n - 1. For some pairs of people, it is known that the two people in the pair know each o...
Count the Days Between Two Dates
Count the Days Between Two Dates You are given two calendar dates as strings in YYYY-MM-DD format. Return the number of days between them as a non-neg...
Optiver SWE Intern HR Screen: Project Deep Dive — Hardest Parts, What You'd Do Differently, and Questions to Ask
You are on a 20–30 minute recruiter (HR) phone screen for a Software Engineering Intern position at Optiver, a high-frequency trading firm. The call s...
Identify OS component causing process starvation
A system with 2 CPU cores runs 5 identical processes continuously. Four processes get equal CPU time, but the fifth appears to get none. Which part of...
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...
In-Memory Key-Value Database with Nested Transactions
In-Memory Key-Value Database with Nested Transactions Implement an in-memory key-value database that processes a sequence of commands and supports nes...
Design a Fixed-Capacity Least-Recently-Used Cache
Design a Fixed-Capacity Least-Recently-Used Cache Design and implement a cache with a fixed maximum capacity that evicts the least recently used entry...
Phone Keypad Predictive Text Suggestions
Phone Keypad Predictive Text Suggestions You are building the predictive-text feature for a classic 9-key phone keypad. Each digit from 2 to 9 maps to...