Decagon Software Engineer Interview Questions
Practice the exact questions companies are asking right now.
"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 Single-Domain Chatbot
Design a chatbot system for a single enterprise customer and a single business domain. For example, the chatbot may answer support questions for one p...
Enumerate 4x4 Tic-Tac-Toe Games
You are given an empty 4x4 board. Two players, X and O, alternate turns, with X moving first. A player wins as soon as they create three consecutive m...
Compute exclusive CPU time from nested logs
You are given logs from a single-threaded CPU that runs n functions (IDs 0 to n-1). Each log entry is a string in the format: - "functionId:start:time...
Design rolling-window conversation score tracker
Design a class that tracks conversation scores over a rolling time window. Requirements You are given a window size W (in seconds) at initialization t...
Design a Real-Time AI Voice System
Design a real-time AI voice system, such as a phone or web-based voice agent that can listen to a user, understand the conversation, generate a respon...
Design Sliding-Window Average Tracker
Design a class that tracks records in a sliding time window. Implement the following API: - init(time_window): initialize the object with a window siz...
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 ...
Design an AI gateway
Design an AI gateway that sits between internal services and multiple LLM providers such as OpenAI and Azure OpenAI. The gateway should expose a unifi...
Design an AI Gateway
Design an AI gateway service that sits between product teams and multiple third-party model providers. The gateway should expose a unified API for cap...
Walk Through One Past Project
Pick one project you personally worked on and explain it in depth. Cover the problem it solved, the users or customers, the main requirements, the arc...
Implement CSAT tracking and call timing
You were asked to solve two coding problems. Problem 1: Implement a rolling CSAT tracker Implement a class CSATTracker for customer-satisfaction score...