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.
"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."
Design a Real-Time Logging System
Design a logging/telemetry system for a large application platform. Requirements: - Many services send log or metric events to the system - Event subm...
Design an At-Most-Once Job Scheduler
Design a distributed job scheduler that supports both one-time and recurring jobs. Requirements: - Clients can create jobs with a schedule, payload, r...
Solve Shortest Paths and Rental Allocation
You are given two independent coding problems. Problem 1: Shortest path in a weighted graph You are given a weighted graph where each edge has a non-n...
Design a distributed job scheduler service
Design a distributed job scheduler service Design a horizontally scalable, multi-tenant job scheduler service that supports both one-off / ad-hoc jobs...
Design an Event Recommendation Engine
You are building an email marketing recommendation engine for a ticketing marketplace. The marketplace has many users and many events. The engine shou...
Implement a Timestamped Counter
Implement a data structure that records calls to an increment method. Requirements: - Each call to increment(timestamp) receives an integer timestamp....
Implement follow graph with snapshots
Problem You are building an in-memory social network relationship store that supports time-travel queries. Users are identified by integers. A directe...
Implement a Shape interface using OOP
Problem You are given the following interface (language-agnostic): `text interface Shape { double area(); double perimeter(); } ` Design and imple...
Design a restaurant waitlist system
You are implementing the waitlist system for a restaurant. Parties arrive over time, can cancel, and get seated when a table becomes available. Rules ...
Synchronize Shared Data Across Two Lists
Build a small mobile app with two list screens that fetch and display data. Some items may appear in both lists. Each item has at least: - id - title ...
Design a 3-day online donation system
System Design: 3-day donation campaign Design an online donation system for a 3-day fundraising campaign. Requirements - Users can donate money to a c...
Compute dasher pay with peak-hour query
Problem: Dasher pay calculation + peak-hour earnings You are given historical delivery records for a driver (“dasher”). Each record contains: - start_...
Implement a leaky-bucket rate limiter
Implement a leaky-bucket rate limiter Implement a Leaky-Bucket Rate Limiter with Tests and Distributed Design Context and Assumptions - Implement in a...
Design sliding-window rate limiter with multi-keys
Design sliding-window rate limiter with multi-keys Design a Precise Sliding-Window Rate Limiter Context You are designing a rate limiter for an API th...
Walk through your background and proud project
Interview prompts (behavioral) 1. Walk me through your background and experience. - Focus on roles, scope, impact, and how your experience relates ...
Resolve routing-number to bank mapping
You are given bank-routing data coming from one or more JSON sources. Each source provides a list of records like: `json { "routing": "026009593", "ba...
Design an ad frequency capping system
Design a frequency capping system for an ads platform. An ad server must decide, for each ad impression opportunity, whether showing an ad would viola...
Demonstrate project impact and teach something
In a hiring-manager or behavioral interview: 1. Pick one recent project and explain: - the problem and why it mattered, - your role and scope, ...
Implement stream line reader and settle balances
Part 1: Streaming line reader from chunked source You are given an existing class ChunkSource with a method nextChunk() that returns the next piece of...
Solve tree and DP problems
This coding round contained two algorithm questions: 1. Deepest shared ancestor in a binary tree You are given the root of a binary tree and two ...