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."
Find Duplicate Files by Content
You are given a list of directory descriptions. Each description has the following format: root_directory file_name_1(content_1) file_name_2(content_2...
Solve Cache, Window, and Heap Problems
You may be asked to solve multiple algorithmic problems in coding rounds: 1. Frequency-based cache: Implement a cache with get(key) and put(key, value...
Implement Snapshot Iterator Without Order Guarantees
Design and implement a mutable collection that supports snapshot iteration. The collection stores unique values and supports the following operations:...
Compute conflicts and minimum meeting rooms
You are given a list of meeting room booking requests. Each request is a half-open time interval [start, end), meaning it uses the room starting at st...
Multi-Level Warehouse Storage with Weighted Retrieval
Multi-Level Warehouse Storage with Weighted Retrieval You are building the in-memory engine for an automated warehouse. The warehouse is a stack of ho...
Implement matrix transpose and KV store
The phone screen for a Linux-oriented software engineering role included multiple coding tasks: 1. Transpose an n x n matrix Given a square matri...
Validate KYC CSV Records
Implement a function that validates business-verification records from a CSV-formatted string. - The first line is a header with exactly 6 comma-separ...
Solve Search Speed and String Product
You are asked to solve two coding problems. Problem 1: Find the Minimum Constant Processing Speed You are given an array piles, where piles[i] is the ...
Implement a Word Guessing Game
Implement a four-letter word guessing game. You are given: - A dictionary containing valid four-letter English words. - A target word selected from th...
Design and Implement a Mini SQL Query Engine
You're given a set of in-memory tables — each table is a collection of rows over a known, typed schema (e.g., a table is a list of row objects, and ea...
Design a Cloud Call-Center Platform for Programmatic Outbound Calls
A SaaS company offers a programmatic calling platform. Business customers (enterprises) integrate through an API: they submit a request to place an ou...
Validate Password Against Multiple Rules
Implement a password validation function for an account security system. You are given: - a string password - an integer min_length - a set of forbidd...
Detect n-length consecutive sequences
Given an unsorted collection of integers and a parameter n > 0, determine whether there exists a set of n distinct integers that form a run of consecu...
Manipulate time-series with Pandas groupby
Given a DataFrame events(user_id, event_type, ts_utc, revenue): 1) Parse ts_utc as timezone-aware, convert to America/Los_Angeles, and handle DST tran...
Calculate minutes between two time strings
Given two times t1 and t2 in "HH:MM" 24-hour format on the same day with t2 > t1, compute the difference in minutes. Show how you parse the strings, c...
Parse logs and query by time
Implement a parser that converts raw log lines into structured records with fields {timestamp, level, message}. Build an API to support: (a) insert(lo...
Solve sliding-window and heap problems
Question Design an algorithm using a sliding window to compute the maximum sum of any contiguous subarray of length k; explain time- and space-complex...
Count changed nodes in N-ary trees
Question Given two N-ary trees (old and new versions) where each node has a key (string), value (int), and list of children, compute how many nodes ar...
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...
Solve island connectivity and string multiplication
Question Given N distinct islands (e.g., a, b, c…) and a list of existing undirected paths between them, compute the minimum number of additional path...