Software Engineer Interview Questions
Practice 4,429 real software engineer interview questions for 2026. Covers top employers like Google, Amazon, OpenAI, and Uber — real questions from actual onsites with detailed solutions — and is built for focused interview preparation. This collection emphasizes coding and algorithms first, then system design, performance, and role-specific domains so you can train the exact skills interviewers test. What’s distinctive: coding rounds still dominate at every company, Google often emphasizes algorithms and distributed-systems thinking, Amazon commonly probes scalable-services design and operational tradeoffs, OpenAI leans toward ML systems, model deployment and inference-scaling problems, and Uber typically asks real-time routing, geospatial and consistency challenges. Expect live coding, pair-programming, and whiteboard/system-design sketches. To prepare efficiently, drill medium-to-hard algorithm problems with time limits, practice end-to-end system design sketches focused on capacity and reliability, and rehearse concise behavioral stories that show ownership and impact.
"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."
Build a validated add-sub calculator
Given a string expression, write a function that validates and evaluates it. The expression represents arithmetic using only non-negative integers and...
Design cache with least-recently-used eviction
You are asked to design an in-memory key–value cache that supports a least-recently-used (LRU) eviction policy. The cache must support the following o...
Refactor a chat message processing function
Task You are given a poorly written JavaScript function that processes an incoming chat message and updates an in-memory store. The code is hard to re...
Implement a dictionary without built-in Dictionary
Implement a key-value map type (a “dictionary” / hash map) from scratch, without using the language’s built-in dictionary/map as the underlying storag...
Implement a size-bounded LRU cache
Design and implement an LRU (Least Recently Used) cache where the cache capacity is measured by total size, not by item count. Each cached item has a ...
Implement String Encryption and Decryption
Implement an encryption service for lowercase words. You are given: - keys: a list of distinct lowercase characters. - codes: a list of strings where ...
Find the k-th largest element in an array
Given an integer array nums and an integer k, return the k-th largest element in the array. Notes: - The k-th largest element is the element that woul...
Describe background and motivations
Describe background and motivations Behavioral Interview Prompts — Technical/Phone Screen (Software Engineer) Context You are preparing for a technica...
Design notification and project architecture
Design notification and project architecture System Design: Multi-Channel Notification Platform Design a scalable Notification System that supports re...
Solve non-repeating show substring
Question LeetCode 3. Longest Substring Without Repeating Characters – variant where the elements are show names instead of numbers. https://leetcode.c...
Implement custom iterator classes
Implement custom iterator classes In a blank coding environment (no IDE assistance, no autocomplete), implement an iterator abstraction entirely from ...
Discuss complex project choices
Discuss complex project choices Behavioral Interview Prompts — Software Engineer (Onsite) Prompt 1: Most Complex Project Describe the most complex pro...
Solve string match and DashMart BFS
Question Implement a string-matching function that returns the first index of a pattern in a text (akin to LeetCode 28 Implement strStr()). 2) “Dash M...
Design cloud & k8s architecture
Design cloud & k8s architecture Technical Screen: Kubernetes, Cloud Services, and Secure CI/CD Context You are designing and operating services on Kub...
Find largest filename from ls -l output
You are given a multi-line string (via stdin) that represents the output of ls -l, with one entry per line. Each file line follows the typical ls -l f...
Build the Largest Available Sequence
You are given an integer array values, a binary string state of the same length, and an integer m such that 0 <= m <= values.length. Build a sequence ...
Compute Plant Infection Stabilization
You are given an m x n grid of plants. Cell types: - X: infected plant - .: healthy plant - I: immune plant (used only in some variants) Two cells are...
Compute longest increasing subsequence length
Coding Question You are given an integer array nums. Return the length of the longest strictly increasing subsequence (not necessarily contiguous). A ...
Maximum Profit from Multi-Stock Trading Records
Maximum Profit from Multi-Stock Trading Records You are given a list of stock price records collected from a trading feed. Each record is a triple: - ...
Implement an in-memory order book API
Problem Implement an in-memory limit order book for a single trading symbol. You do not need to implement order matching/execution—only store and main...