CCitigroup
Banking · Financial Services · Investment Banking
Most recent
Resolve N+1 query problem in ORM
DDynatrace
Observability · AIOps
Most recent
A Time You Diagnosed a Performance Problem
ZZapier
Workflow Automation · iPaaS
Most recent
Add Two Numbers (Linked List)
MMiro
Visual Collaboration · Whiteboard
Most recent
Remove All Adjacent Duplicates in String
Most recent
Design a Doc-as-App Model: Tables + Formulas + Buttons (OOD)
Most recent
Generate a String From Binary Tree Node Values
QQualcomm
Mobile Semiconductors
Most recent
Double Pointers: Modify a Pointer Via a Function
DDell Technologies
Hardware · Enterprise IT
Most recent
Maximum Subarray (Kadane)
VVercel
Frontend Cloud · Deployment
Most recent
Take-Home: Build a File Management App (Practical)
Most recent
Computer Architecture & OOP Design Deep Dive
PPalantir
Data Analytics · Defense
Most recent
Implement a Graph: Add/Remove Nodes & Edges, Path Search, Cycle Detection
IIBM
Enterprise Technology · AI
Most recent
Design a Scalable Document Search Service
Most recent
API Calls: Fetch, Parse, and Compute
Most recent
Course Schedule (Topological Sort)
DDatabricks
Data & AI Platform
Most recent
Word Ladder (Shortest Transformation)
AAkamai
CDN · Cloud Security
Most recent
Networking & OS Fundamentals Deep Dive
NNetflix
Streaming · Entertainment
Most recent
Design Netflix Video Streaming
DDatadog
Observability · Monitoring
Most recent
Merge Sorted Streams / Top-K
SSupabase
Open-source Backend · DB
Most recent
Practical: Implement Row-Level Security Filtering
IIntuit
Financial · Tax Software
Most recent
Design a Personal Finance / Expense Categorization System
RRetool
Internal Tools · No-code
Most recent
Design a Reactive State System for an App Builder (OOD)
AAirtable
Database · No-code
Most recent
A Time You Balanced Product Polish and Speed
CCloudflare
CDN · Network Security
Most recent
Implement an LFU / TTL Cache
MMake (Integromat)
Workflow Automation
Most recent
A Time You Learned a New Domain Quickly
CConfluent
Data Streaming · Kafka
Most recent
Concurrency: Reliable In-Order Event Processing
Most recent
Longest Substring Without Repeating Characters
HHPE
Enterprise Hardware · Cloud
Most recent
Find the Duplicate Number
NNew Relic
Observability · APM
Most recent
Two Sum / Hash Map Fundamentals
Most recent
Design Dropbox File Sync / Storage
Most recent
What Makes Well-Crafted, Maintainable Code?
AAutodesk
Design · CAD Software
Most recent
Valid Parentheses (Stack)
PPlanetScale
Serverless Database · MySQL
Most recent
Route a Query to the Correct Shard (Practical)
SSnowflake
Data Cloud · Warehousing
Most recent
Design a Thread-Safe Concurrent LRU Cache
Most recent
Find All Subarrays With a Given Sum
LLinear
Issue Tracking · Dev Tools
Most recent
Design a Fast Issue-Tracking System
HHashiCorp
Infrastructure Automation
Most recent
Implement a Key-Value Store With Transactions (Go)
SServiceNow
Enterprise Service Mgmt
Most recent
A Time You Handled Conflicting Priorities
AAmplitude
Product Analytics
Most recent
Design an Event Tracking SDK / Client (OOD)
CCisco
Networking · Security
Most recent
Search in Rotated Sorted Array
FFigma
Design · Collaboration
Most recent
Design Figma's Component Model (OOD)