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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
12.0k
Companies
570
Updated
10.05.2026
12.0k Questions 570 Companies10.05.2026
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 20 results
UiPath logo
UiPath
Medium
Machine Learning Engineer

Reliable LLM tool calling: format control, failure recovery, and runaway loops

You are building an LLM agent that uses tools: functions or APIs the model can invoke while working on a task. Answer the following questions about to...

Machine LearningAI AgentsLLM Applications
0
0
11 people solved
Sep 9, 2026
Scale AI logo
Scale AI
Easy
Backend Engineer Locked

Design a Durable Task Scheduling Service

Design a durable distributed scheduler for one-time and recurring tasks while keeping scheduling separate from execution. Define lifecycle and time se...

System DesignJob Scheduling & WorkflowsDistributed Coordination
29
1
237 people solved
Jul 27, 2026
Snapchat logo
Snapchat
Medium
Software Engineer

Design a Metrics System

Design a metrics system. Begin by clarifying what kinds of metrics it serves, who queries them, and the required freshness, retention, scale, and tole...

System DesignObservabilityData Ingestion & CDC
1
0
33 people solved
Aug 22, 2026
Plaid logo
Plaid
Medium
Software Engineer Locked

Reason About Rate Limiting Under Memory and Throughput Pressure

Design an in-memory rate limiter that remains useful when request volume makes per-request queues too costly. Compare exact and approximate policies w...

Software Engineering FundamentalsRate LimitingData Structure Design
19
0
159 people solved
Aug 1, 2026
Amazon logo
Amazon
Medium
Software Engineer

Explain Decoder-Only LLM Architecture and How vLLM Serves It Efficiently

This question comes from an AI-infrastructure-focused software engineering loop in which both the machine learning round and the system design round c...

Machine LearningLLM Inference & ServingTransformers & Attention
2
0
16 people solved
Sep 5, 2026
Perplexity logo
Perplexity
Medium
Software Engineer

Implement time-versioned KV store with restore

Design and implement an in-memory key–value store where every operation is associated with a timestamp (monotonically increasing integer). The store m...

Coding & AlgorithmsKey-Value StoresData Structure Design
36
0
298 people solved
Feb 6, 2026
Airbnb logo
Airbnb
Medium
Machine Learning EngineerSenior+

Explain ML Project Milestones, Scope, and Conflict

Describe an ML project you worked on, focusing on how you defined its scope, chose milestones, and handled a disagreement that affected delivery. Expl...

Behavioral & LeadershipProject Deep DiveConflict & Collaboration
2
0
15 people solved
Sep 4, 2026
Snowflake logo
Snowflake
Medium
Software Engineer Locked

Query Unique and Most-Frequent Keys in a Recent Event Window

Process a timestamp-ordered event stream while retaining only its most recent m arrivals. Answer historical-cutoff queries for distinct-key count and ...

Coding & AlgorithmsData Structure DesignStacks & Queues
18
0
145 people solved
Aug 3, 2026
Reddit logo
Reddit
Medium
Machine Learning Engineer

Design a Comment-Likelihood Prediction System with a Focus on Feature and Model Serving

Design the machine-learning system behind comment likelihood on a large discussion platform where posts belong to communities: given a user and a post...

ML System DesignML Data Pipelines & Feature StoresMLOps & Model Serving
1
0
17 people solved
Sep 7, 2026
DoorDash logo
DoorDash
Easy
Data ScientistSenior+

Measure Customers Ordering from Bottom-Quartile Restaurants

Measure Customers Ordering from Bottom-Quartile Restaurants Write one PostgreSQL SELECT statement or CTE query. Do not create, alter, or modify tables...

Data Manipulation (SQL/Python)SQLMetrics & KPIs
8
1
127 people solved
Jul 27, 2026
Instacart logo
Instacart
Hard
Software Engineer Locked

Library Catalog and Lending System: Five-Phase Engineering Assessment

Practice a five-phase library catalog and lending assessment that combines requirements clarification, coding-assistant implementation, manual metrics...

Software Engineering Fundamentals
7
0
61 people solved
Aug 3, 2026
Socure logo
Socure
Hard
Software Engineer Locked

Implement a Concurrent Payment Queue with Visibility Timeouts

Implement an in-memory payment queue with atomic receives, visibility timeouts, ACK races, stale-callback protection, and idempotent payment processin...

Software Engineering FundamentalsConcurrencyData Structure Design
4
0
32 people solved
Sep 5, 2026
Amazon logo
Amazon
Medium
Software Engineer

Deliver an Important Project Under a Tight Deadline

Describe an important project you delivered under a tight deadline, including the tradeoffs and business impact. Constraints & Assumptions Use a real ...

Behavioral & LeadershipOwnership & ExecutionPrioritization & Tradeoffs
1
0
11 people solved
Sep 14, 2026
Amazon logo
Amazon
Medium
Software Engineer

Finding the Root Cause of an Intermittent Failure When the Obvious Metrics Look Healthy

Tell me about a time when a system was failing intermittently, and the very obvious metrics were all looking good. How did you find the root cause, an...

Behavioral & LeadershipDebuggingObservability
0
0
8 people solved
Sep 10, 2026
Qualified Health logo
Qualified Health
Hard
Software Engineer

Stream LLM Output While Committing Reliable DAG Results

A workflow runs an LLM task whose output must appear incrementally in an interactive client. Downstream DAG nodes, however, require the complete struc...

System DesignReal-Time SystemsJob Scheduling & Workflows
0
0
5 people solved
Sep 30, 2026
Airbnb logo
Airbnb
Easy
Software Engineer Locked

Design an In-Memory Cloud Storage Service with Users, Backups, and Restore

Design an in-memory cloud storage service with globally named files, user quotas, largest-file queries, account merges, and per-user backup and restor...

Software Engineering Fundamentals
7
0
73 people solved
Aug 17, 2026
Snowflake logo
Snowflake
Medium
Software Engineer Locked

Resolve Inherited Allow and Deny Permissions in a DAG

Resolve each node's permission in an inheritance DAG where any reachable deny overrides an allow and nodes without an inherited decision are denied by...

Coding & AlgorithmsGraphsAuthentication & Authorization
11
0
156 people solved
Aug 15, 2026
Google logo
Google
Medium
Software EngineerSenior+ Locked

Compute a Depth-Weighted Sum of a Nested List

Compute the depth-weighted sum of integers in an unevenly nested list. Compare recursive and iterative traversals while handling empty lists, negative...

Coding & AlgorithmsParsing & InterpretersMath & Number Theory
48
4
585 people solved
Aug 6, 2026
Google logo
Google
Easy
Software Engineer Locked

Count Rectangle Coverage on a Grid

Apply many inclusive rectangular increments to a square grid and return the final coverage count for every cell. The exercise emphasizes upper-bound e...

Coding & AlgorithmsGrids & Matrices
70
3
564 people solved
Jul 21, 2026
Confluent logo
Confluent
Medium
Software Engineer

Design an RSS News Feed Service

Design an RSS news feed service. The service lets users subscribe to RSS sources, ingests articles from those sources on a schedule, stores article me...

System DesignSearch & Feed SystemsAPI Design
29
0
392 people solved
Apr 29, 2026
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