String and Array Manipulation Interview Patterns
4 min read String and Array Patterns Overview String and array manipulation problems are a staple of coding interviews at every level. The […] Read article
Algorithms
System Design
System Design Interview: Data Warehouse and OLAP Architecture
10 min read What Is a Data Warehouse? A data warehouse (DW) is an analytical database optimized for reading large volumes of historical Read article
System Design
System Design Interview: Zero-Downtime Deployments
10 min read Why Zero-Downtime Deployments Planned downtime windows are increasingly unacceptable — global users span every time zone, and even brief outages Read article
Algorithms
Ruby on Rails Interview Questions (2025)
5 min read Rails Interview Questions Overview Ruby on Rails powers Shopify, GitHub (partially), Airbnb, and many startups. Senior Rails interviews test deep Read article
System Design
System Design Interview: Raft Consensus Algorithm Deep Dive
9 min read Why Consensus Matters Distributed systems need to agree on values — which server is the primary, what the current config Read article
System Design
System Design Interview: GraphQL API at Scale
9 min read Why GraphQL for Large APIs GraphQL solves two fundamental REST API problems: over-fetching (the response includes fields the client doesn’t Read article
Algorithms
Interval and Greedy Interview Patterns: Meeting Rooms, Job Scheduling, and Activity Selection
6 min read Why Greedy and Interval Problems Greedy algorithms appear frequently in FAANG interviews because they test whether you can identify when Read article
System Design
System Design Interview: Serverless Architecture and Function-as-a-Service
9 min read What Is Serverless? Serverless (Function-as-a-Service / FaaS) lets you deploy individual functions without managing servers. AWS Lambda, Google Cloud Functions, Read article
System Design
System Design Interview: Event Sourcing and CQRS
10 min read What Is Event Sourcing? Traditional systems store the current state of data (the latest balance in a bank account, the Read article
Algorithms
Segment Tree and Fenwick Tree: Range Query Interview Patterns
5 min read When to Use Range Query Data Structures Range query problems appear frequently in senior engineering interviews and competitive programming: “find Read article
System Design
System Design Interview: Machine Learning Training Infrastructure
10 min read Why ML Training Infrastructure Is a System Design Interview Topic Companies building AI products at scale — OpenAI, Google, Meta, Read article
System Design
System Design Interview: Multi-Tenant SaaS Architecture
10 min read What Is a Multi-Tenant Architecture? Multi-tenancy means a single instance of a software application serves multiple customers (tenants), with each Read article
Algorithms
Swift and iOS Interview Questions (2025)
9 min read Swift Interview Questions Overview iOS engineering roles at Apple, Airbnb, Uber, and fintech companies require deep Swift knowledge. Interviewers test Read article
System Design
System Design Interview: Database Replication and High Availability
9 min read Why Database Replication? A single database server is a single point of failure. Replication copies data from a primary (write) Read article
System Design
System Design Interview: Real-Time Bidding Platform (Ad Exchange)
10 min read The global programmatic advertising market is $500B. Every time a web page loads, a real-time auction runs in under 100 Read article