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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
150
Companies
569
Updated
10.14.2026
150 Questions 569 Companies10.14.2026
PLTCHK testimonial
PLTCHK

"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"

_The_TaNk_ testimonial
_The_TaNk_

"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"

Chris testimonial
ChrisSenior SWE, LinkedIn

"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."

sleepy33 testimonial
sleepy33

"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."

Jake testimonial
JakeSenior ML Engineer, Lyft

"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."

nuggetlord testimonial
nuggetlord

"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."

Carlos testimonial
CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes testimonial
boba.tea.vibes

"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."

Andy testimonial
AndySWE-II, Google

"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."

couchpotato99 testimonial
couchpotato99

"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."

Shruti testimonial
ShrutiData Engineer, Salesforce

"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."

midnightramen testimonial
midnightramen

"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."

Bianca testimonial
BiancaFrontend Eng, Figma

"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."

tambrahm007 testimonial
tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa testimonial
toa

"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."

PLTCHK testimonial
PLTCHK

"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"

_The_TaNk_ testimonial
_The_TaNk_

"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"

Chris testimonial
ChrisSenior SWE, LinkedIn

"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."

sleepy33 testimonial
sleepy33

"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."

Jake testimonial
JakeSenior ML Engineer, Lyft

"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."

nuggetlord testimonial
nuggetlord

"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."

Carlos testimonial
CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes testimonial
boba.tea.vibes

"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."

Andy testimonial
AndySWE-II, Google

"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."

couchpotato99 testimonial
couchpotato99

"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."

Shruti testimonial
ShrutiData Engineer, Salesforce

"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."

midnightramen testimonial
midnightramen

"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."

Bianca testimonial
BiancaFrontend Eng, Figma

"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."

tambrahm007 testimonial
tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa testimonial
toa

"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."

Showing 50 results
Okta logo
Okta
Medium
Backend EngineerSenior+

Build and Review a Configurable Node.js Token-Bucket Rate Limiter

Build a Node.js Express application that reads a configuration file and exposes an API governed by a token-bucket rate limiter. Then explain the imple...

Software Engineering FundamentalsRate LimitingCode Quality & Maintainability
1
0
28 people solved
Oct 5, 2026
Mercor logo
Mercor
Medium
Software Engineer

Find the Production Bugs in a Dictionary Cache Around an Expensive Computation

The interviewer shows you a short piece of code that caches the results of an expensive function, and asks you to find the problems with it. The origi...

Software Engineering FundamentalsCachingConcurrency
6
0
74 people solved
Sep 17, 2026
Optiver logo
Optiver
Hard
Software EngineerNew Grad

Reviewing a Freight-Scheduler Codebase: Bugs, Data Structures, and Concurrency

You have just finished implementing process_order(...) inside a large provided codebase for a freight-scheduling system (this is the review stage of a...

Software Engineering FundamentalsConcurrencyDebugging
30
1
364 people solved
Nov 16, 2025
PayPal logo
PayPal
Medium
Software Engineer

Design a Payment Fraud Detection Service

Design a real-time fraud detection service for a payment platform. When a user submits a payment attempt, the platform calls your service before autho...

System DesignSystem Design FundamentalsPayments & Ledgers
13
0
112 people solved
Apr 14, 2026
Rippling logo
Rippling
Medium
Software Engineer Locked

Design a Rule Evaluation Engine for Spending Policy Violations

Prepare for a Rippling software engineering interview question about design a rule evaluation engine for spending policy violations. The prompt highli...

Software Engineering FundamentalsLow-Level Design (OOP)AI-Assisted Development
65
2
1008 people solved
Jul 1, 2026
Luma AI logo
Luma AI
Medium
Software Engineer

Explain Your Motivation and How You Use AI Development Tools in Your Workflow

A recruiter screen for a software engineering role on an AI product team covers four topics. Prepare an answer to each as you would give it in the cal...

Behavioral & LeadershipMotivation & FitAI-Assisted Development
0
0
13 people solved
Sep 17, 2026
Stripe logo
Stripe
Medium
Software Engineer Locked

Prepare for Backend Parsing, API Integration, AI Coding, and Bug Fixing Rounds

Prepare for a Stripe software engineering interview question about prepare for backend parsing, api integration, ai coding, and bug fixing rounds. The...

Software Engineering FundamentalsParsing & InterpretersAPI Integration & HTTP Clients
130
1
1883 people solved
Jul 4, 2026
Ambience logo
Ambience
Hard
Machine Learning Engineer Locked

Design an ICD-10 Prediction System for Clinical Records

Design an ICD-10 prediction system for clinical records, covering labels, model choices, rare-code evaluation, long documents, and reviewer feedback.

ML System DesignModel EvaluationAnnotation & Label Quality
2
0
21 people solved
Sep 3, 2026
Rippling logo
Rippling
Medium
Software EngineerSenior+ Locked

Staff Engineer Hiring-Manager Round: Platform Ownership, AI Adoption, and Cross-Team Influence

This question evaluates a candidate's ability to narrate scope, ownership, and cross-team influence at the senior or staff engineering level, using a ...

Behavioral & LeadershipProject Deep DiveLeadership & Influence
19
0
167 people solved
Jun 13, 2026
Composio logo
Composio
Medium
Software Engineer Locked

Generate a Semantic Dependency Graph from Tool Schemas

Design a generator that turns arbitrary tool input and output schemas into an explainable dependency graph. The task covers nested JSON Schema, semant...

Software Engineering FundamentalsGraphsAI Agents
7
0
74 people solved
Aug 9, 2026
TikTok logo
TikTok
Medium
Software Engineer

Implement list, form, and API rendering with pitfalls

Take-home: Build a Small Frontend App (List + Form + API + A11y) Goal Implement a simple web app that demonstrates core frontend skills: rendering fro...

Software Engineering Fundamentals
11
0
86 people solved
Aug 12, 2025
Bridgewater logo
Bridgewater
Medium
Machine Learning Engineer Locked

Diagnose Strong Validation and Weak Production Performance

Diagnose why a model shows strong validation metrics but performs poorly in production by ranking and testing competing hypotheses. Examine leakage, s...

Machine Learning
12
0
86 people solved
Jul 8, 2026
Netflix logo
Netflix
Hard
Machine Learning Engineer

Review a Feature Pipeline PR for Production Risks, Then Serve Features by Freshness

In the practical coding half of a machine learning screen, the interviewer pastes a pull request that changes a feature pipeline: the code that turns ...

ML System DesignML Data Pipelines & Feature StoresBatch & Stream Processing
1
0
14 people solved
Sep 28, 2026
Microsoft logo
Microsoft
Medium
Software Engineer Locked

Find the Bugs in an AI-Generated URL Shortener

This question evaluates a candidate's ability to review AI-generated code for correctness, consistency, and robustness rather than write code from scr...

Software Engineering FundamentalsAI-Assisted DevelopmentDebugging
94
2
633 people solved
Jun 12, 2026
Rippling logo
Rippling
Medium
Software Engineer

Design expense rules engine and return type

Design a Rules Engine for Corporate Card Expenses Context We offer a corporate credit card that employees use for business expenses. Managers set poli...

System DesignLow-Level Design (OOP)API Design
203
0
1889 people solved
Aug 7, 2025
LinkedIn logo
LinkedIn
Medium
Machine Learning EngineerSenior+ Locked

Debug Binary Logistic Regression Training Code

Debug binary logistic-regression training by restoring complete cross-entropy, deriving the gradient as predictions minus labels, separating logits fr...

Machine Learning
9
0
93 people solved
Aug 13, 2026
Figureai logo
Figureai
Medium
Data EngineerSenior+ Locked

Explain How AI Changes Data Engineering Work

Explain how AI-assisted tools could reshape data engineering while preserving human accountability. Cover risk-based task boundaries, privacy, indepen...

Behavioral & LeadershipAI-Assisted Development
3
0
21 people solved
May 20, 2026
Color Health logo
Color Health
Medium
Software EngineerNew Grad Locked

Build and Review an Employee Expense Reimbursement Application

Complete a staged, AI-assisted full-stack expense application exercise from requirements interview through implementation and independent review. Buil...

Software Engineering FundamentalsAI-Assisted Development
7
0
71 people solved
Aug 10, 2026
DoorDash logo
DoorDash
Medium
Software Engineer

Build an Order-Exception Microservice with Explicit Refund Policies

Design a local microservice that handles reported delivery problems for orders, including partial loss, complete loss, and delay. It should decide whe...

Software Engineering FundamentalsPayments & LedgersAI-Assisted Development
4
0
80 people solved
Sep 10, 2026
Datadog logo
Datadog
Medium
Software Engineer Locked

Design an LLM Agent System That Automatically Resolves Jira Tickets and Opens Pull Requests

This ML system design question evaluates the ability to architect an autonomous LLM-agent pipeline spanning retrieval-augmented generation, tool integ...

ML System DesignAI AgentsRetrieval-Augmented Generation
61
0
408 people solved
Jun 4, 2026
NVIDIA logo
NVIDIA
Medium
Applied ScientistIntern

How AI Agents Fit Into Your Research Workflow: Ideas, Experiments, and Paper Writing

In a research internship interview, you are asked how AI agents have changed your research. Describe your current day-to-day research workflow across ...

Behavioral & LeadershipAI-Assisted Development
0
0
13 people solved
Sep 17, 2026
Luma AI logo
Luma AI
Medium
Software Engineer

Build Collaborative Document Editing Shared by People and AI Agents

This prompt is one of five offered in a take-home for a software engineering role on an AI product team. The candidate picks one prompt; across the se...

System DesignReal-Time SystemsAI Agents
1
0
20 people solved
Sep 17, 2026
Amazon logo
Amazon
Medium
Software Engineer Locked

Implement Review Content Moderation

This question evaluates a candidate's ability to implement consistent server-side content moderation and stateful persistence handling in a backend se...

Software Engineering FundamentalsCode Quality & MaintainabilityApplication Security
13
0
147 people solved
May 24, 2026
Cisco logo
Cisco
Easy
Software Engineer

Testing a New Feature: Planning Test Cases and Handling Flaky Tests

You own quality for a team, and a new feature is about to enter testing. Explain how you test it and how you plan its test cases, then explain how you...

Software Engineering FundamentalsTesting & Quality
4
0
51 people solved
Sep 19, 2026
DoorDash logo
DoorDash
Hard
Software Engineer Locked

How to prepare for AI-assisted coding interviews?

This question evaluates proficiency in integrating AI coding assistants and developer tooling with core software engineering competencies such as debu...

Software Engineering FundamentalsAI-Assisted DevelopmentDebugging
65
0
589 people solved
Feb 12, 2026
Microsoft logo
Microsoft
Medium
Software EngineerSenior+

Use AI to Reduce Repetitive Pipeline Development Work

How would you use AI to generate or modify a development pipeline and reduce repetitive work while retaining responsibility for the resulting behavior...

Software Engineering FundamentalsAI-Assisted DevelopmentCI/CD & Deployment
2
0
22 people solved
Sep 10, 2026
Google logo
Google
Medium
Software Engineer Locked

Design an Online Coding Judge Platform

This question evaluates a candidate's competencies in large-scale system design, secure multi-tenant execution and sandboxing, capacity planning, queu...

System DesignSandboxing & IsolationSystem Design Fundamentals
140
0
966 people solved
May 2, 2026
Plaid logo
Plaid
Medium
Machine Learning Engineer

Design a Fraud Detection System

Design a machine learning system for a fintech data-connectivity platform such as Plaid that detects fraudulent activity across the user lifecycle — b...

ML System Design
25
0
243 people solved
Apr 30, 2026
Capital One logo
Capital One
Medium
Software EngineerSenior+

Explain How AI Supports Your Engineering Work

Describe how you use AI in day-to-day engineering work and how it can improve your output. Give a concrete example involving coding or design, and exp...

Behavioral & LeadershipAI-Assisted Development
4
0
69 people solved
Aug 23, 2026
Luma AI logo
Luma AI
Medium
Software Engineer

Build an App That Helps Friends Decide Where and When to Eat

This prompt is one of five offered in a take-home for a software engineering role on an AI product team. The candidate picks one prompt; across the se...

Product Design & StrategySystem Design FundamentalsAI-Assisted Development
1
0
10 people solved
Sep 17, 2026
Capital One logo
Capital One
Medium
Data Scientist

Validate Unit-Test Coverage and Identify Missing Scenarios

Validate Unit-Test Coverage and Identify Missing Scenarios Scenario Tech round: reviewing an existing unit-test that exercises the class from Part 2 Q...

Coding & AlgorithmsTesting & Quality
12
0
146 people solved
Aug 4, 2025
PayPal logo
PayPal
Hard
Data Scientist

Detect credit-card transaction fraud

Credit-Card Fraud Detection: Real-Time Decisioning and System Design You are designing a real-time decisioning system for card-payment authorizations ...

ML System DesignModel EvaluationUnsupervised Learning
20
0
228 people solved
Aug 4, 2025
Luma AI logo
Luma AI
Medium
Software Engineer

Reverse-Engineer an App's Undocumented API and Rebuild It With Better UX

This prompt is one of five offered in a take-home for a software engineering role on an AI product team. The candidate picks one prompt; across the se...

Software Engineering FundamentalsAPI Integration & HTTP ClientsProduct Design & Improvement
0
0
12 people solved
Sep 17, 2026
Stripe logo
Stripe
Hard
Software EngineerSenior+

Build a Transaction Rule Engine with AND/OR Chains and Nested Parentheses

Build a rule engine that decides whether each payment transaction is accepted or denied. - Transactions: a list of records, each a set of named attrib...

Software Engineering FundamentalsParsing & InterpretersAI-Assisted Development
14
0
230 people solved
Aug 30, 2026
Luma AI logo
Luma AI
Medium
Software Engineer

Build a Scalable Text-to-Speech Service Prototype, Then Defend and Extend It

This prompt is one of five offered in a take-home for a software engineering role on an AI product team. The candidate picks one prompt; across the se...

System DesignSystem Design FundamentalsAI-Assisted Development
1
0
13 people solved
Sep 17, 2026
DoorDash logo
DoorDash
Medium
Software EngineerSenior+

Build Two Interacting Services That Carry Out a Realistic Refund Flow

Implement a refund flow as two services that interact with each other to complete a refund. This is an AI-assisted coding round: an AI coding assistan...

Software Engineering FundamentalsPayments & LedgersDistributed Transactions & Idempotency
5
0
56 people solved
Sep 10, 2026
DoorDash logo
DoorDash
Medium
Software Engineer

Review Constant-Time Random Courier Selection and Removal

Review a delivery-assignment service that stores couriers in dasher_map under contiguous integer keys starting at 0. add_dasher inserts a courier. pic...

Software Engineering FundamentalsData Structure DesignCode Quality & Maintainability
4
0
40 people solved
Sep 5, 2026
DoorDash logo
DoorDash
Medium
Software Engineer

Debug and refactor a legacy module

Given a legacy module named DasherPicker and a failing test suite, systematically debug and refactor the code while following a provided review checkl...

Coding & AlgorithmsCode Quality & MaintainabilityConcurrency
51
0
392 people solved
Jul 15, 2025
Amazon logo
Amazon
Hard
Software Engineer

Design a fraud detection system

Design a Real-Time Payment Fraud Detection System Design an ML-powered system that scores each online card-not-present (CNP) payment during authorizat...

ML System DesignAnnotation & Label QualityML Data Pipelines & Feature Stores
21
0
178 people solved
Aug 10, 2025
Valon logo
Valon
Medium
Software Engineer

Build a staged banking service: ATM cash, statements, transfers, fees, slow transfers

Build a banking service in five parts, adding one capability per part. Each part comes with a sample input file of actions and the expected output, an...

Software Engineering FundamentalsLow-Level Design (OOP)Payments & Ledgers
1
0
25 people solved
Jan 16, 2026
Amazon logo
Amazon
Medium
Software Engineer

Behavioral: Verifying AI Output, Team-Wide AI Wins, and Investigating AI Errors

The behavioral part of a software engineering phone screen focuses entirely on how you use AI tools in your work. Answer each of the three questions w...

Behavioral & LeadershipAI-Assisted Development
1
0
14 people solved
Oct 1, 2026
Parafin logo
Parafin
Hard
Software Engineer

Design loan application system

Design an End-to-End Loan Application Platform You are a software engineer at a small lending startup. Design a scalable, compliant loan origination s...

System DesignSystem Design FundamentalsDistributed Transactions & Idempotency
76
0
546 people solved
Aug 4, 2025
Adyen logo
Adyen
Easy
Machine Learning Engineer AI Locked

Build a Payment Fraud Detection Model

This question evaluates a candidate's competency in applied machine learning for payment fraud detection, covering data preprocessing, temporal train/...

Machine LearningML System DesignModel Evaluation
36
0
692 people solved
May 9, 2026
Anthropic logo
Anthropic
Medium
Software Engineer

Describe a Python design-and-coding approach in Colab

Python Coding-and-Design Exercise in Google Colab You are given an open-ended coding-and-design exercise to complete in Python, and the interviewer re...

System DesignCode Quality & MaintainabilityTesting & Quality
42
0
473 people solved
Sep 6, 2025
LinkedIn logo
LinkedIn
Hard
Machine Learning EngineerSenior+

Debug a From-Scratch Logistic Regression: Sigmoid Derivative and Gradients

You are given a small NumPy implementation of binary logistic regression trained with full-batch gradient descent. It should learn a weight vector w a...

Machine LearningML CodingDebugging
10
0
66 people solved
Oct 1, 2026
Atlassian logo
Atlassian
Medium
Software Engineer Locked

Design a rating aggregator that returns totals and averages

This question evaluates a candidate's competency in designing and implementing data structures and algorithms for maintaining dynamic aggregates (tota...

Coding & Algorithms
8
0
108 people solved
Jan 22, 2026
Confluent logo
Confluent
Medium
Software EngineerSenior+

Design a Reliable URL Shortening Service

Design a Reliable URL Shortening Service Design a service that accepts a long URL and returns a short URL, then redirects short-code requests to the s...

System Design
5
1
76 people solved
Jan 1, 2026
Google logo
Google
Medium
Software EngineerSenior+

Answer Staff-level leadership scenarios using STAR

Behavioral prompts (Staff/L6) Provide structured answers (e.g., STAR) for scenarios like: 1. Most important technical decision you drove: how you deci...

Behavioral & LeadershipLeadership & InfluenceCommunication & Stakeholders
9
0
104 people solved
Jan 12, 2026
Meta logo
Meta
Medium
Machine Learning Engineer Locked

Design weapon-selling ad detection from posts

This question evaluates a candidate's ability to design a production-scale multimodal ML system for detecting weapon-selling ads, testing competencies...

ML System DesignModel EvaluationSupervised Learning
15
0
115 people solved
Dec 15, 2025
NVIDIA logo
NVIDIA
Medium
Software Engineer

Implement matrix transpose and KV store

The phone screen for a Linux-oriented software engineering role included multiple coding tasks: 1. Transpose an n x n matrix Given a square matrix ...

Coding & Algorithms
6
0
92 people solved
Feb 9, 2026
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