Software Engineer Interview Questions
Practice 4,229 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."
Compute longest common subsequence length
Problem You are given two strings s and t. A subsequence of a string is obtained by deleting zero or more characters without changing the order of the...
Solve small string and API tasks
You are given three small programming tasks (typical “easy” difficulty). Implement each as a function. Task 1: Validate parentheses Given a string s c...
How would you scale batch image pipelines?
Design a system to process m input images with n pipelines, producing m×n outputs. - Pipelines are sequences of image operations (resize/rotate/filter...
Design a Code Review Agent
Design an AI-powered code review agent that assists developers by reviewing pull requests and producing actionable feedback. The agent should be able ...
Design Global Nearby Restaurant Search
Design a simplified global food-delivery platform similar to a restaurant marketplace. Requirements: - Merchants can register and manage restaurants. ...
Design a Secure Medical Audio Pipeline
You are reviewing a backend service for a healthcare application. The service accepts a medical audio recording, converts it to text, sends the transc...
Implement File Tail and Sensor Health
This interview included two coding tasks. 1. Print the last N lines of a file You are given a very large newline-delimited text file and a limited ...
Handle payment-service outages
You own a service that computes courier payouts and then submits payout requests to a downstream payment processor. What should your system do if the ...
Explain your biggest project with trade-offs
Behavioral interview (Amazon-style). 1) Pick the biggest/most impactful project you worked on. Explain the problem, your role, the technical design, a...
Design a distributed crossword fill solver
Scenario You are building a service that fills a crossword-like grid with words. - The board size is not specified; assume a medium board around 50×50...
Describe conflict resolution and initiative
The behavioral round reportedly consisted of 7-8 standard questions. A polished version of the expected prompts would be: - Tell me about a time you h...
Implement a multi-level digital recipe manager
Implement a RecipeManager class for a digital recipe manager. The task is progressive (Levels 1–4). You can assume a single-process in-memory implemen...
Compute minimal operations and optimal server pairing
You are given two independent coding problems. Problem 1: Minimum range-increments to make an array nondecreasing Given an integer array power of leng...
Design concurrent range-aware file caching client
Design concurrent range-aware file caching client System Design: High-throughput Client-side Ranged-read File Cache You are asked to design and specif...
Merge two sorted arrays in-place
Given two arrays arr1 and arr2, both sorted in ascending order. - Modify arr1 in-place to contain all elements from arr1 and arr2 in ascending order. ...
Solve Three Coding Problems
The interview included three coding problems: 1. Streaming top-k class. Design a class for an integer stream with a fixed parameter k. It should suppo...
How do you learn new knowledge quickly?
Behavioral questions 1. How do you learn new knowledge/technology quickly? Provide a concrete example. 2. What was the most challenging project you wo...
Describe failures, self-reflection, and conflict resolution
Answer the following behavioral prompts with recent examples: 1. Self-reflection / improvement - “In a recent project, where could you have done be...
Find missing rank in a straight
You are given a list of 4 distinct characters representing card ranks from a 5-card straight (5 consecutive ranks) with exactly one rank missing. Rank...
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...