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."
Implement string-based big integer multiplication
Question Implement multiplyStrings(a, b) to multiply two non-negative integers given as decimal strings and return their product as a decimal string. ...
Design receipt system with combo discounts
Question You are building a point-of-sale ordering UI for a food-ordering workflow. You are given class stubs and a callback you must wire up: - Item(...
Design video platform and catalog system
System Design: Two Independent Systems You are asked to design two large-scale systems. For each system, provide: - Scope and key requirements - Exter...
Reconstruct itinerary with lexicographic ties
You are given m airline tickets as directed pairs [from, to]. Build an itinerary that starts at a specified airport start (e.g., "JFK") and uses every...
Search target in unknown-length sorted array
You have read-only access to a sorted, increasing array-like interface of unknown length that supports get(i), which returns a valid integer for in-bo...
Assess behavioral competencies across scenarios
Behavioral Competency Prompts (Software Engineer, HR Screen) Provide specific work situations that demonstrate each competency below. Use concise STAR...
Design circular sliding-window ratio tracker
You are given a circular binary array A of length n (A[i] ∈ {0,1}) and a fixed window size w (1 ≤ w ≤ n). Define r (i) as the fraction of 1s within th...
Design autonomous cloud monitoring and remediation
Design an AI-Assisted Monitoring and Auto-Remediation Service Context Design a service that monitors cloud applications across multiple providers, col...
Build User Journey Path Summary
Implement a function build_summary(logs) -> str that summarizes user journeys as a trie-like path tree. You are given a list of action logs. Each log ...
Parse a protobuf-like schema and answer queries
You are given a single string schema describing message types in a simplified, protobuf-like language. Your task is to parse the schema and support tw...
Solve jump maximization and palindromic path queries
You are given two independent algorithmic problems. --- Problem 1 — Jump game with special destinations (maximize score) You are given an integer arra...
Design Food Delivery Cart
Design the backend for a shopping cart in a large food-delivery application. Users should be able to: - create or resume a cart for a restaurant, - ad...
Design a Versioned Key-Value Store
Implement a data structure for storing values by key over time. The structure should support these operations: - put(key, value, timestamp): Store the...
Design an OOD restaurant management system
Object-oriented design: Restaurant management system Design an object-oriented system for a dine-in restaurant that supports the following: Functional...
Flatten nested JSON into a string map
Problem You are given an input JSON object that may contain nested objects and arrays. Your task is to flatten it into a single-level key/value mappin...
Print directory tree with indentation
You are given a root directory of a filesystem represented as a tree. Each node is either a directory (can have children) or a file (no children). Pri...
Explain HTTP methods and your usage
Explain HTTP methods and your usage HTTP Methods, Idempotency, Safety, and Practical Use Context You design and consume RESTful APIs for high-throughp...
Implement 3x3 matrix transforms and rotation
Implement 3x3 matrix transforms and rotation For a 3x3 matrix, write Python code to: (a) transpose it in-place; (b) swap any two rows and any two colu...
Determine validity after digit-constrained deletions
Determine validity after digit-constrained deletions You're given a string S of length n consisting only of '(' , ')' , and digits '0'–'9'. For every ...
Design a basic banking system
Design a Basic Online Banking System with Safe Money Movements Problem Design a minimal but production-minded online banking service. The service must...