Interval and Greedy Interview Patterns: Meeting Rooms, Job Scheduling, and Activity Selection
Why Greedy and Interval Problems Greedy algorithms appear frequently in FAANG interviews because they test whether you can identify when […]
Algorithms
System Design
System Design Interview: Serverless Architecture and Function-as-a-Service
What Is Serverless? Serverless (Function-as-a-Service / FaaS) lets you deploy individual functions without managing servers. AWS Lambda, Google Cloud Functions,
System Design
System Design Interview: Event Sourcing and CQRS
What Is Event Sourcing? Traditional systems store the current state of data (the latest balance in a bank account, the
Algorithms
Segment Tree and Fenwick Tree: Range Query Interview Patterns
When to Use Range Query Data Structures Range query problems appear frequently in senior engineering interviews and competitive programming: “find
System Design
System Design Interview: Machine Learning Training Infrastructure
Why ML Training Infrastructure Is a System Design Interview Topic Companies building AI products at scale — OpenAI, Google, Meta,
System Design
System Design Interview: Multi-Tenant SaaS Architecture
What Is a Multi-Tenant Architecture? Multi-tenancy means a single instance of a software application serves multiple customers (tenants), with each
Algorithms
Swift and iOS Interview Questions (2025)
Swift Interview Questions Overview iOS engineering roles at Apple, Airbnb, Uber, and fintech companies require deep Swift knowledge. Interviewers test
System Design
System Design Interview: Database Replication and High Availability
Why Database Replication? A single database server is a single point of failure. Replication copies data from a primary (write)
System Design
System Design Interview: Real-Time Bidding Platform (Ad Exchange)
The global programmatic advertising market is $500B. Every time a web page loads, a real-time auction runs in under 100
System Design
System Design Interview: Ride-Sharing App (Uber / Lyft)
Uber operates in 70+ countries with 5M+ trips per day and 4M+ drivers. Designing a ride-sharing app covers real-time geospatial
System Design
System Design Interview: Ticketing System (Ticketmaster)
Ticketmaster sells 500M+ tickets per year. A Taylor Swift tour launch can generate 3.5 billion system requests in a single
System Design
System Design Interview: Fraud Detection System
Payment fraud costs $32 billion annually. Every payment processor, bank, and marketplace needs a fraud detection system that identifies fraudulent
Algorithms
Java Interview Questions: JVM Internals, Concurrency, and Design Patterns (2025)
Senior Java interviews at Google, Amazon, LinkedIn, and enterprise shops go deep on JVM internals, concurrency, and the language semantics
System Design
System Design Interview: E-Commerce Platform (Amazon)
Amazon processes 100K+ orders per minute on Prime Day. Designing an e-commerce platform covers product catalog management, inventory at scale,
Algorithms
C# Interview Questions: .NET, LINQ, async/await, and Memory Management (2025)
C# is the dominant language at Microsoft, enterprise .NET shops, Unity game studios, and fintech companies running on Windows infrastructure.