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."
Maximize Boundary-Difference Subarray Sum
Given an integer array nums and an integer k, find the maximum possible sum of a non-empty contiguous subarray whose first and last elements differ by...
Solve Two Array Optimization Problems
You are given two coding problems from the same interview round. Problem 1: Split a gold chain fairly An array weights represents the weights of conse...
Design a least-recently-used cache
Design a least-recently-used cache Design and implement a least-recently-used (LRU) cache with a fixed capacity. Support get(key) -> value and put(key...
Design a metrics monitoring system
Design a metrics monitoring system System Design: Metrics Monitoring Platform Context Design a cloud‑native, multi‑tenant metrics monitoring system fo...
Implement a thread-safe periodic job scheduler
Implement a thread-safe periodic job scheduler Problem: Periodic Job Scheduler (Concurrency) Implement a small in-process job scheduler that can run p...
Scale Digit-Square Convergence Requests
Design a service that receives very high request volume for the digit-square convergence operation. For each request, the input is a positive integer ...
Describe failure impact and resolve cross-functional conflict
You are in a behavioral interview. Answer the following prompts using a structured method (e.g., STAR or CARL). Provide specific details, metrics wher...
Design Stock Price Alerts
Design a stock price alert system that allows users to create alerts for securities and receive notifications when the market price crosses a specifie...
Convert stack samples to trace events
Question Implement convertToTrace(samples) that, given a chronologically ordered vector of stack samples (each sample contains a timestamp and a call-...
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...
Simulate a Turn-Based Two-Player Game
Design and implement a simulator for a two-player turn-based board game similar to tic-tac-toe. Requirements: - The game is played on an n x n board. ...
Implement a match-3 board resolver
Question Implement a match-3 board resolver (the core loop of a "candy crush"-style game). You are given an m×n grid of cells. Each cell holds a value...
Implement stateful connection router simulator
You are implementing a simplified connection router / load balancer for a Jupyter-like multi-tenant server system. There are N target servers, indexed...
Find minimal time to serve customers
Find minimal time to serve customers You manage a bank with k tellers; teller i takes serviceTimes[i] minutes to serve one customer and works continuo...
Find Optimal Piecewise Constant Regression Parameters
Given a dataset of one-dimensional training examples \((x_i, y_i)\) for \(i = 1, \dots, n\), fit a one-split piecewise constant regression model: \[ \...
Find Shortest Queue with Few Calls
You are given a list of queues of integers. For each queue, the only available operations are isEmpty() and poll(), where poll() removes and returns t...
Print a Centered Pascal Triangle
Given a positive integer height, generate the first height rows of Pascal's triangle and print them as a centered text triangle. Formatting requiremen...
Find shortest path on infinite grid
You are given an infinite 2D grid with integer coordinates. From a cell (x, y) you may move in 4 directions (North/South/East/West) by 1 cell per move...
Check if all substrings are anagrams of words
You are given a string s (letters only) and access to an English dictionary dict (a set of valid words). Return true if every contiguous substring of ...
Compress editor keystrokes into insert/delete/skip
You are implementing a simplified collaborative editor sync format. You are given: - An initial document string doc. - A list of user input operations...