Software Engineer Interview Questions
Practice 4,429 real software engineer interview questions for 2026. Covers top employers like Google, Amazon, OpenAI, and Uber — real questions from actual onsites with detailed solutions — and is built for focused interview preparation. This collection emphasizes coding and algorithms first, then system design, performance, and role-specific domains so you can train the exact skills interviewers test. What’s distinctive: coding rounds still dominate at every company, Google often emphasizes algorithms and distributed-systems thinking, Amazon commonly probes scalable-services design and operational tradeoffs, OpenAI leans toward ML systems, model deployment and inference-scaling problems, and Uber typically asks real-time routing, geospatial and consistency challenges. Expect live coding, pair-programming, and whiteboard/system-design sketches. To prepare efficiently, drill medium-to-hard algorithm problems with time limits, practice end-to-end system design sketches focused on capacity and reliability, and rehearse concise behavioral stories that show ownership and impact.
"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 smallest permutation under constraints
Given a non-negative integer n, consider its decimal digits as a multiset (digits can repeat). 1) Return the smallest possible integer that can be for...
Implement Plurality and Runoff Voting
You are given a list of ballots for an election. Each ballot is an ordered list of distinct candidate names, from highest preference to lowest prefere...
Compute minimum servers for cyclic tasks
You are given a list of tasks running on servers. Each task is represented as a pair (start, duration): - start is the start time in minutes from the ...
Find shortest relationship path using BFS
Problem You are given a set of pairwise relationships between entities (people/services/etc.). Treat each relationship as an undirected edge in a grap...
Compute decayed power levels in a graph
You are given an unweighted graph representing a network of wires. - The graph has N nodes labeled 0..N-1 and M edges (each edge is a bidirectional wi...
Implement a debounce function
Problem: Implement debounce(fn, wait) Implement a debounce utility function. Behavior Given a function fn and a delay wait (milliseconds), debounce(fn...
Implement bitmap font render/compress/invert
Bitmap Character to Image Conversion (3 phases) You are given a bitmap lookup table (a dictionary/map) that represents a tiny “font”. - Key: a charact...
Compute interval mode, BST range sum, exclusive time
You are given several independent coding tasks. A) Most frequent integer covered by intervals You are given an integer range [-M, M] and a list of inc...
Explain Java follow-ups after solving coding problem
After you implement an algorithmic solution in Java, the interviewers ask follow-up questions and request modifications. Answer/discuss (and, where re...
Simulate pouring water onto terrain
Problem You are given an integer array heights representing a 1D terrain (each index is a column height), an integer V (units of water), and an index ...
Solve string and hashmap coding tasks
You will solve the following coding tasks (independent of each other). Provide clear input/output behavior and handle edge cases. 1) Longest non-repea...
Produce valid student lineup from parent array
You are given a hierarchy of n students represented by a parent array par of length n. - Students are labeled 1..n. - par[i] is the parent (mentor/man...
Decompress encoded string with nested repeats
Given an encoded string, decompress it into its expanded form. Encoding rules: - Parentheses (...) denote a group. - A repetition count is written in ...
Decode a JWT string without libraries
Implement a function that decodes (but does not necessarily verify) a JWT token. A JWT is a string of the form: ` <base64url(header)>.<base64url(paylo...
Find most frequent call path in logs
You are given a sequence of trace log lines for a single-threaded program. Each line is either a function entry or exit: - Entry: "-> funcName" - Exit...
Answer suffix maximum-frequency queries
You are given: - An integer array nums of length n. - An integer array queries of length m, where each queries[k] is an index i (0-based) into nums. F...
Explain learning paradigms, loss, and embeddings
ML fundamentals (oral) Answer the following conceptual questions clearly and with examples: 1. What is supervised learning? What are typical inputs/la...
Compute iterative sliding-window sum reduction
Problem Given an integer array nums and an integer window size k, repeatedly apply the following reduction: - If len(nums) > k: replace nums with a ne...
Can you visit all rooms and score parentheses?
Problem 1: Visit all locked rooms with keys There are n rooms labeled 0..n-1. All rooms are locked except room 0. - When you enter room i, you find a ...
Choose fastest transportation mode on city grid
You live in a city modeled as a 2D grid. Each cell is either: - A transportation mode 1..4 where: - 1 = Walk, 2 = Bike, 3 = Car, 4 = Train - S = sou...