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."
Compute task order and layered execution
You have N tasks labeled 0..N-1 and prerequisite pairs (a, b) meaning task a must complete before task b can start. Return any valid execution order o...
Debug using logs and allocate tasks
You inherit a service where unit tests pass locally, but production logs show intermittent errors. Without a debugger, outline a step-by-step debuggin...
Implement a Log Rate Limiter
You are building a backend logging service. Implement a class that decides whether an incoming log message should be emitted. Each request provides: -...
Debug round-robin request router
Debug round-robin request router Round-Robin Request Router with Health and Dynamic Membership You are given a list of backend servers and an incoming...
Design a Netflix-like streaming platform
Design a Netflix-like streaming platform System Design: Netflix‑Like Video Streaming Platform Context Design a large-scale video streaming platform th...
Design appointment scheduling data model and APIs
Scenario You are extending an existing healthcare system that already has User and Patient management APIs. - Doctors and Staff are Users. - Patients ...
How do you deliver when time is tight?
Scenario You are assigned a project with an aggressive deadline and limited time/resources. Question How would you ensure the project gets delivered o...
Design a content moderation platform
Design a large-scale content moderation system for a short-video platform. Users can upload videos, captions, comments, audio, and other metadata. The...
Design a Group Chat / Messaging System
Design a Group Chat / Messaging System Design the backend for a real-time group chat feature embedded in a large consumer product (think of the in-app...
Design a content moderation system
Design a content moderation system for a large-scale product where users can submit content (e.g., text posts, images, videos, comments, or messages)....
Design a multi-tenant course purchase and delivery system
Design a multi-tenant online course purchasing and delivery system with the following requirements. Domain model / requirements - There are multiple C...
Handle conflict, priorities, and ownership scenarios
Behavioral interview prompts Answer the following behavioral questions. Use concrete examples from your experience. 1) Disagreement / conflict - Descr...
Count islands by requested sizes
You are given a 2D grid of characters '0' and '1', where '1' represents land and '0' represents water. An island is a maximal group of horizontally/ve...
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 object-oriented parking lot system
Design an object-oriented model for a parking lot management system. Requirements: - The parking lot has multiple levels; each level has multiple park...
Solve three OA coding questions
You are given a 90-minute online assessment containing three coding questions. Implement solutions for all questions. --- Question 1: Group strings th...
Design a crash-resilient file system
Prompt Design a resilient file system that can recover file contents correctly after a system crash (e.g., power loss / kernel panic). The interviewer...
Remove minimum invalid mixed brackets
Given a string s containing letters and bracket characters from the set (), [], {}, remove the minimum number of bracket characters so that the result...
Return the k-th row of Pascal-like triangle
Problem Given an integer rowIndex (0-indexed), return the rowIndex-th row of Pascal’s triangle. Pascal’s triangle is defined as: - Row 0 is [1] - Each...
Implement a timestamped map
Implement an in-memory timestamped map. Support these operations: - put(key, value, timestamp): store value for key at the given integer timestamp - g...