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."
Find top-K frequent elements in a stream
You receive a large stream of items (e.g., integers or strings) that may not fit in memory. Design an algorithm that can return the top K most frequen...
Design autocomplete and merchant bulk edits
System Design Prompts 1) Design search engine input suggestions (autocomplete) Design a system that provides real-time query suggestions as a user typ...
Walk through project scope, ownership, and decisions
Walk through project scope, ownership, and decisions Behavioral: Walk Through a Significant Project (Technical Screen — Software Engineer) Provide a d...
Implement string-based candlestick classifier
Implement a function that takes a single input string encoding N daily OHLC price records in the format "o1,h1,l1,c1;o2,h2,l2,c2;...;oN,hN,lN,cN" (sem...
Determine Whether Queries Can Zero Array
You are given an integer array nums of length n and a list of range queries queries, where each query is of the form [l, r, val]. For a query [l, r, v...
Implement an In-Memory File Storage System
Implement an in-memory file storage service. You need to support files identified by a unique full path string, such as "/docs/a.txt". Each file has a...
Design receipt system with combo discounts
Question You are building a point-of-sale ordering UI for a food-ordering workflow. You are given class stubs and a callback you must wire up: - Item(...
Explain median vs mean for L1/L2
Median vs. Mean Under L1 and L2 Loss, and the 2D Extension Explain, with intuition and a brief derivation, the relationship between the choice of loss...
Explain AI coding assistant usage strategy
Responsible Use of AI Coding Assistants in a Live Coding Interview Context In a live technical screen where AI coding assistants are allowed, you are ...
Set up a Python LLM dev environment
Task: Reproducible Local Python Environment for a Mistral Agent You are to set up a clean, fully reproducible local Python environment to develop a sm...
Design resilient auth with flaky third-party tokens
System Design: Resilient, Secure Request Flow with Unreliable Third‑Party Authorization Context You are designing a multi‑region, HTTP/JSON API where ...
Explain project scope, timeline, and delegation
10–15 Minute Project Deep Dive (Behavioral and Leadership in a Technical Screen) Context You are asked to present a concise, slide-driven deep dive on...
Explain conflict resolution and growth
Behavioral & Leadership: Conflict, Mistake, and Project Deep Dive To assess collaboration, ownership, and technical leadership, answer the following t...
Design a ride-sharing system (Uber)
Design a large-scale ride-sharing platform similar to Uber. Cover: - Rider and driver apps (account, availability, requesting rides). - Real-time driv...
Design a swipeable video feed backend
Design the backend service for a short-video product similar to a “Spotlight”-style feed. Scope: only the backend “feed vending” functionality that po...
Answer Staff-level leadership scenarios using STAR
Behavioral prompts (Staff/L6) Provide structured answers (e.g., STAR) for scenarios like: 1. Most important technical decision you drove: how you deci...
Diagnose Return Eligibility Scoring Bugs
You are working on an e-commerce return-eligibility service. For each return request, the service computes a risk score using signals such as: - how m...
Answer Leadership and GenAI Behavioral Questions
Prepare structured behavioral interview answers for the following prompts. Use specific real experiences, quantify impact when possible, and be ready ...
Count same-color squares in a character grid
You are given a 2D grid (matrix) of characters. Each character represents a color: cells with the same character are considered the same color. Formal...
Explain SystemVerilog verification concepts and write constraints
Answer the following SystemVerilog / DV questions. Use short explanations and, where appropriate, show small SV code snippets. 1) Concurrency: Explain...