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.
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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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"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."
Design globally consistent metadata service
System Design Prompt Design a global-scale metadata service used by many internal products. Goals / Requirements - Writes must be strictly consistent ...
Maximize sum without choosing adjacent elements
Problem You are given an integer array nums where nums[i] is the value in position i. Select a subset of indices such that no two selected indices are...
Minimize reduction cost and validate equal-sum pairs
You are given two independent coding tasks. Task 1: Minimum total cost to reduce an array You are given an integer array arr of length n. You may repe...
Find linked merchants by shared fields
You are given a list of merchants. Each merchant is a dictionary/object with the following fields: - id (unique identifier) - name - email - phone Ass...
Maximize Unique Characters from Words
You are given a list of lowercase English words. Select a subset of the words such that no character appears more than once across all selected words....
Describe a failure and what you learned
Behavioral Describe a time you failed. - What was the situation and your goal? - What went wrong (your role/responsibility)? - What actions did you ta...
Solve string transform and min-move sorting
Problem 1: "Goat Latin"-style string transformation You are given a sentence s consisting of words separated by single spaces. Transform it into a new...
Implement multi-level task manager APIs
You are implementing an in-memory task management system with a set of APIs that evolve over 4 levels. All APIs receive a timestamp: int parameter. Un...
Design a food delivery system
Design a food delivery platform (similar to common restaurant delivery apps). Core user stories 1. Customers can browse restaurants/menus, place an or...
Design a rating aggregator that returns totals and averages
Design and implement a simple rating system (like movie/book reviews) that supports adding ratings and querying summary statistics. Requirements Imple...
How to prepare for a hiring manager round
You have an upcoming hiring manager (HM) / behavioral interview round (plus a separate HR round) for a quantitative/tech role. Question 1. What does a...
Explain how Kafka works
Prompt Explain how Apache Kafka works at a high level and then in more detail. Cover at least: - Core entities: broker, topic, partition, producer, co...
Implement a debounced function (with leading option)
Problem Implement a debounce utility in JavaScript/TypeScript. Write a function: `ts function debounce<T extends (...args: any[]) => any>( func: T, ...
Answer core teamwork and conflict stories
You are in a behavioral interview. Prepare to answer the following prompts using concrete examples from your experience. Prompts 1. Describe a challen...
Explain inheritance, polymorphism, constructors, destructors
OOP fundamentals Answer the following concept questions and provide a small example where requested: 1. Inheritance vs. polymorphism - Explain what...
Explain AWS access control and frontend typing
You are interviewing for a full-stack role. Answer the following conceptual questions. Part A — Cloud / AWS 1. VPS vs EC2 - What is a VPS conceptua...
Design a file sync and sharing service
Scenario Design a cloud file storage, sync, and sharing service similar to a consumer/team drive product. Core requirements - Upload/download files fr...
Compute urn-draw probabilities and expectations
Urn Drawing Probabilities (Without Replacement) You have an urn with 12 balls: 5 red (R) and 7 blue (B). You draw two balls uniformly at random withou...
Design an in-memory key-value store using maps
Design a low-level key-value store library (like an embedded storage engine) under an interview constraint: you may use only map/dictionary-like data ...
Design a large-scale web crawler
Design a web crawler that continuously discovers and downloads web pages. Requirements: - Start from seed URLs and crawl at scale. - Avoid duplicate c...