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.
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"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."
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"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."
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"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."
Diagnose overloaded Kubernetes cluster
Kubernetes Overload: End-to-End Debug + Mitigation Plan You are given a Kubernetes-based microservices system that is currently overloaded, exhibiting...
Design a video streaming platform like Netflix/YouTube
System Design Design a large-scale video streaming platform similar to Netflix/YouTube. Core user stories 1. Upload (creator) / ingest (studio) videos...
Find kth smallest and count stair-climbing ways
You are given two separate algorithm questions. A) Find the k-th smallest element in an array (no sorting) Given an integer array nums of length n and...
Coordinate workers across two exclusive targets
You are given two exclusive resources (targets) labeled "A" and "B". You need to start N = 10 parallel workers (e.g., processes or threads), each of w...
Maximize sum with no adjacent tree nodes
Given the root of a binary tree where each node contains an integer value (can be 0 or positive), choose a subset of nodes such that no selected node ...
Compute reachable cells for a cleaning robot
You are given a 2D grid representing a floor plan: - 0 = free cell (the robot may stand on it) - 1 = blocked cell (obstacle) The robot can move from a...
Determine whether a word exists in a letter grid
Given an m x n grid of characters board and a string word, determine whether word can be constructed from sequentially adjacent cells. Rules: - Adjace...
Compute balances with transaction fees and rejections
You are building a simple ledger. Inputs - A list of account names. - An initial balance for each account. - A list of transfer transactions, each wit...
Maximize minimum value after k decrements
You are given an integer array vulnerabilities of length n, where vulnerabilities[i] is the initial security score of server i. You must perform exact...
Explain owning and debugging infra modules
Describe a time you were responsible for a storage/distributed-systems/infra component (or a similarly low-level, reliability-critical module). The in...
Merge overlapping intervals
Given an array of closed intervals intervals, where each interval is [start, end] and start <= end, merge all overlapping intervals and return an arra...
Troubleshoot a single-node web outage
You own a single-machine web server (one host running the web service). Suddenly users report that a specific page (or the whole website) is down. 1. ...
Design a distributed key-value store
Scenario Design a distributed key-value (KV) store. Requirements Functional - API: - Get(key) -> value | not_found - Put(key, value) (optionally w...
Minimize total distance to a store
Question 1: Choose a CVS location to minimize total distance You are given an M x N grid grid containing only 0 and 1. - grid[r][c] = 1 means there is...
Group strings that are anagrams
Problem: Group anagrams Given an array of strings strs, group the strings that are anagrams of each other. Two strings are anagrams if they contain th...
Answer behavioral screen questions
Answer behavioral screen questions HR Screen — Behavioral Questions (Software Engineer) Context: You are interviewing for a Software Engineer role in ...
Design an e-commerce category page
Design an e-commerce category page System Design: Category Page with Facets, Sorting, Pagination, SEO, Caching, Personalization, and Real-Time Updates...
Debug and refactor a legacy module
Given a legacy module named DasherPicker and a failing test suite, systematically debug and refactor the code while following a provided review checkl...
Decide string transform with directional tokens and walls
Decide string transform with directional tokens and walls You are given two equal-length strings start and target of length n, each consisting only of...
Implement three interview-style coding tasks
You are given three separate coding tasks, all focused on algorithm and data-structure design. --- Task 1: Longest Bounded-Difference Subarray You are...