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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
11.9k
Companies
570
Updated
10.05.2026
11.9k 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
Salesforce logo
Salesforce
Easy
Software Engineer

Explain a Project Architecture and the Technology Choices Behind It

Interview Prompt Walk a hiring manager through one project you worked on and the technology stack behind it. Explain the problem, architecture, your p...

Behavioral & Leadership
9
0
68 people solved
Aug 23, 2026
Revolut logo
Revolut
Medium
Software EngineerNew Grad

Design multi-region banking data synchronization

System design: Global bank with multi-region data consistency A digital bank operates in multiple geographic regions (e.g., EU, US, APAC). Users can l...

System DesignConsistency & AvailabilityConsensus & Replication
57
0
709 people solved
Feb 11, 2026
Jane Street logo
Jane Street
Hard
Quantitative TraderIntern

Alternating Die-Roll Game: Optimal Accept/Reject Strategy

Two players, A and B, play the following game with a fair 21-sided die whose faces are labeled with the integers $-10, -9, \ldots, 9, 10$ (one integer...

Software Engineering FundamentalsPuzzles & BrainteasersProbability
46
1
330 people solved
Nov 20, 2025
Sig logo
Sig
Medium
Quantitative Trader

Probability You Picked the Strongest Cat Given Your Cat Lost the Race

Three cats run a race, and exactly one of them wins. Their probabilities of winning are $x$, $y$ and $z$, with $x + y + z = 1$. Before the race you pi...

Statistics & MathProbability
0
0
4 people solved
Sep 19, 2026
Roblox logo
Roblox
Medium
Software Engineer

Find most frequent call stack from logs

Given an array of log entries for a single-threaded program's function calls, each entry is either '->Name' (function entry) or '<-Name' (function exi...

Coding & AlgorithmsStacks & Queues
103
1
935 people solved
Aug 11, 2025
Jane Street logo
Jane Street
Medium
Quantitative Researcher

Design a Real-vs-Fake DNA Classifier

Question You are given DNA sequences over the alphabet {A, C, G, T}, where sequence lengths may vary. You have: - a small labeled dataset containing b...

Machine LearningFeature EngineeringML System Design
28
0
476 people solved
Jan 27, 2026
Ramp logo
Ramp
Hard
Software Engineer Locked

Implement a Clean In-Memory Transaction Ledger

Build a clean in-memory ledger for deposits, withdrawals, transfers, and balance queries using integer cents. Preserve atomic transfers, reject overdr...

Software Engineering FundamentalsLow-Level Design (OOP)Data Structure Design
13
0
120 people solved
May 25, 2026
Affirm logo
Affirm
Medium
Software Engineer

Count Distinct PII in Underwriting Events

Count Distinct PII in Underwriting Events An event stream contains underwriting and fraud_flag events. Count the distinct nonempty personally identifi...

Coding & Algorithms
11
1
84 people solved
Apr 19, 2026
Waymo logo
Waymo
Easy
Data Scientist Locked

Merge overlapping intervals per group in pandas

This question evaluates proficiency in time-series data manipulation and interval reasoning using pandas, including grouping, datetime handling, and i...

Data Manipulation (SQL/Python)Pandas & Python DataIntervals & Scheduling
27
0
184 people solved
Jan 17, 2026
Anduril logo
Anduril
Medium
Software Engineer Locked

Find Heap Objects Not Referenced by the Stack

Find heap objects that are not directly referenced by any stack address when heap objects have no outgoing references. Use efficient set membership to...

Coding & Algorithms
7
0
58 people solved
Jul 10, 2026
LinkedIn logo
LinkedIn
Medium
DevOps EngineerSenior+ Locked

Design a CI Job Scheduler with Live Build Output

Design a continuous-integration scheduler where source changes create dependency-aware builds, workers execute jobs, and users see live status and std...

System Design
3
0
65 people solved
Aug 1, 2026
Databricks logo
Databricks
Medium
Software EngineerNew Grad

Design KV store with sliding-window average QPS

Problem Design an in-memory key–value store that supports mutation operations and can report the average QPS (queries per second) over a recent time w...

Coding & AlgorithmsData Structure Design
45
0
577 people solved
Dec 17, 2025
Discord logo
Discord
Medium
Software EngineerNew Grad

Design a TCP Discord-like chat server

Design a Discord-like chat server that accepts multiple clients over raw TCP (e.g., test via PuTTY/telnet). Functional requirements: - Clients connect...

System DesignReal-Time Systems
63
0
658 people solved
Jan 27, 2026
Jane Street logo
Jane Street
Medium
Software Engineer

Merge Two Insertion Diffs in Linear Time

A text-editing system represents changes to a document as insertion diffs. An insertion diff is a set of (position, value) pairs, where each pair mean...

Coding & AlgorithmsArrays & StringsTwo Pointers & Sliding Window
22
1
402 people solved
Jul 11, 2025
Sig logo
Sig
Easy
Data Scientist

Find the Expected Number of Consecutive Chosen Pairs

Find the Expected Number of Consecutive Chosen Pairs Choose 6 distinct numbers uniformly from the integers 1 through 35. A consecutive pair is an adja...

Statistics & Math
1
0
18 people solved
Aug 16, 2026
Anthropic logo
Anthropic
Medium
Software Engineer

Generate outputs for images and pipelines

You are given m input images and n processing pipelines. - Each pipeline is an ordered list of k operations (e.g., resize, rotate, crop, blur, color t...

Coding & AlgorithmsConcurrency
143
0
1548 people solved
Nov 10, 2025
Upstart logo
Upstart
Medium
Software Engineer Locked

Find the Minimum Absolute Difference

Find the smallest absolute difference between values at two distinct positions without changing the caller's list. Cover duplicates, negative and very...

Coding & AlgorithmsSorting
10
1
159 people solved
Jul 27, 2026
Pinterest logo
Pinterest
Hard
Software Engineer

Design an Ad Click Aggregator for Last-Year Counts Using an Existing Logging API

Design a system that aggregates ad clicks. Unlike the commonly practiced version of this problem, which focuses on near-real-time counts over the last...

System DesignAds SystemsBatch & Stream Processing
1
0
12 people solved
Jul 7, 2026
Meta logo
Meta
Medium
Data Scientist Locked

Compare Survey Satisfaction for New and Established Users

Write PostgreSQL to compare survey satisfaction for new and established users across countries. The challenge emphasizes date-based cohort rules, inva...

Data Manipulation (SQL/Python)SQL
7
2
126 people solved
Jul 6, 2026
Anduril logo
Anduril
Medium
Software Engineer Locked

Evaluate a Variadic Addition or Subtraction Expression

Implement a variadic expression evaluator that supports addition and left-associative subtraction over integer operands. Practice accumulator initiali...

Coding & Algorithms
5
0
42 people solved
Aug 2, 2026
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