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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"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."
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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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"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
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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."
"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."
Minimize Branch Merge Conflicts
You are given several feature branches that must all be merged into the main branch. Each branch contains a sequence of commits, and each commit modif...
Design a production file storage service
System Design: Production-Grade File Storage Service Problem Design a production-grade file storage service with the following APIs, semantics, and co...
Design Food Ratings and Driver Payouts
Design the backend for a food-delivery product (think DoorDash-style marketplace). The system has two distinct surfaces that you must address together...
Implement Timeout Refund Workflow
You are given a skeleton workflow engine for order processing. A workflow is a directed graph of nodes. Each node receives an OrderContext and returns...
Answer conflict, tight deadline, and mentorship prompts
Behavioral Interview Prompts Answer the following with specific examples from your experience: 1. Conflict: Tell me about a time you had a conflict wi...
Implement a Credit API Workflow
You are given documentation for a sandbox credit-management API. The documentation describes API operations for creating an account, adding credits, c...
Design a Tic-Tac-Toe Engine
Implement an n x n Tic-Tac-Toe game engine for two players. Support a method move(row, col, player) that records a move and returns whether that move ...
Describe Leading a Technical Project
In a hiring manager behavioral interview, use a real past engineering project to answer the following questions: 1. What project did you lead, and why...
Optimize least-k revenue queries for read/write load
Follow-up Scenario Now assume revenue is not provided as a flat list of events, but may be nested, for example: - Each customer has many orders, and e...
Minimize Travel Assignment Cost
You are given n people who each need to travel to exactly one of two cities: San Francisco or New York. The input is an array costs, where costs[i] = ...
Implement a thread-safe money transfer
Problem: Implement a concurrent-safe transfer function You are given an in-memory store of bank accounts: - Each account has an accountId and a balanc...
Design camera-footage upload with custody chain
System design prompt You’re building a backend service for uploading recorded body-camera / dashcam footage from client devices (often on unreliable n...
Design a KV store with QPS API
Design a key-value (KV) store that supports basic read/write operations and also exposes an API to report QPS (queries per second). Functional require...
Design a scalable logging system
Design a centralized logging system for a large organization — an internal observability platform (think a self-hosted Splunk / Datadog Logs / ELK) th...
Design a banking system with payments and merging
Design a banking system (progressive requirements) Design the backend for a simplified banking system that supports accounts, money movement, schedule...
Design Publisher Configuration Rules
Design a supply-side advertising configuration system that manages publisher-specific rules. A publisher may own many websites, mobile apps, channels,...
Design pipeline using classification and embedding services
You are given two black-box ML services: 1. Classification Service - Input: One or more text documents. - Output: A label for each document (e.g...
Count subarrays with sum equals k
Given an integer array nums (may contain negative numbers and zeros) and an integer k, return the number of contiguous subarrays whose sum is exactly ...
Design a Resilient Document Aggregation Service
Design a Resilient Document Aggregation Service Your team owns a backend service that assembles a "document bundle" for clients. To build one bundle, ...
Highest Salary Using Java Streams
Highest Salary Using Java Streams You are given a list of Employee objects. Each Employee is a plain Java object (POJO) with the following fields: `ja...