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."
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"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."
"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 coffee ordering system
System Design: Coffee Ordering System Design a system for a coffee shop (or chain) that supports ordering drinks. Core use cases - Customer browses me...
Design a sandboxed cloud IDE
System design: Sandboxed cloud IDE (Colab-like) Design a multi-tenant, browser-based cloud IDE/notebook that lets users run code in an isolated sandbo...
Design a single-node persistent in-memory cache
Scenario Design a single-machine cache used by a web service to handle read/write requests. The cache should: - Store key/value pairs in memory (fast ...
Implement an in-memory database with TTL and backup
In-Memory Database (Levels 1–4: TTL and Backup/Restore) Implement an in-memory database that stores records identified by a string key. Each record co...
Improve classifier with noisy multi-annotator labels
Problem You are given a text dataset for a binary classification task (label in \{0,1\}). Each example has been labeled by multiple human annotators, ...
Design an ads audience targeting system
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Explain KV cache in Transformer inference
Question In Transformer-based language model inference, what is a key-value (KV) cache? Explain: - What gets cached (tensors, shapes at a high level) ...
Implement an in-memory SQL-like table
Problem Implement a simple in-memory database for one table. All values are strings. Each row is identified by a rowKey (string). Each row contains co...
Implement frequency + distance top‑K queries
You will implement solutions for two coding interview questions. Question 1: Return the top‑K points by frequency (with distance tie‑break) You are gi...
Implement credit ledger with out-of-order timestamps
Problem You are implementing a GPU credit ledger that supports adding credits, charging credits, and querying balances. Requests can arrive in any tim...
Implement topological sort and tree boundary traversal
You are given two separate coding tasks. Problem A — Order courses with prerequisites You have n courses labeled 0..n-1 and a list of prerequisite pai...
Design stack with O(1) minimum query
Design a stack-like data structure that supports the following operations, each in O(1) time: - push(x): push integer x onto the stack - pop(): remove...
Design a RAG system with evaluation
Scenario You are asked to design a Retrieval-Augmented Generation (RAG) system that answers user questions using a private corpus (e.g., internal docs...
Implement an in-memory DB with TTL backup/restore
Problem Design an in-memory database that stores values in a nested structure: - key (string) → field (string) → value (string) - Each (key, field) en...
Design a distributed crossword fill solver
Scenario You are building a service that fills a crossword-like grid with words. - The board size is not specified; assume a medium board around 50×50...
4.2 Design a Collaborative Document Editor
Real-time collaborative editing is one of those features that feels magical when it works — and absolutely nightmarish to build from scratch. Google D...
Compute ads revenue by geography in SQL
You have ad delivery logs for a shop-ads system. Tables ad_impressions - impression_id STRING (PK) - ts TIMESTAMP (UTC) - user_id STRING - shop_id STR...
How to evaluate similar-listing notifications feature
Case study (Marketplace product analytics) Context: Circle is a US marketplace app for buying and selling second‑hand products. On a product listing p...
Implement toy-language types and generic substitution
Problem: Toy Language Type System (Printing + Generic Resolution) You are implementing a small type system for a custom “Toy Language”. Types can be: ...
Design a fraud detection system
Scenario You are designing an end-to-end fraud detection system for an online platform (e.g., e-commerce marketplace, payments, account signup, or ad ...