Database Indexing and Query Optimization Interview Guide
Database Indexing and Query Optimization for Interviews Database indexing questions appear frequently in system design interviews and sometimes as standalone […]
Algorithms, System Design
System Design
Low-Level Design: Elevator System (OOP Design Interview)
Elevator System Low-Level Design Designing an elevator system is a classic low-level design (LLD) interview question asked at companies like
System Design
System Design Interview: Design a Chat Application (WhatsApp)
System Design Interview: Design a Chat Application (WhatsApp) Designing a real-time messaging application like WhatsApp is a comprehensive system design
Algorithms
Design Patterns in Python for Coding Interviews (2025)
Design Patterns in Python for Coding Interviews (2025) Python-specific design pattern implementations come up in senior coding rounds at Stripe,
System Design
Low-Level Design Interview: Design a Parking Lot System
Low-Level Design: Design a Parking Lot System Parking lot is a classic Low-Level Design (LLD) / Object-Oriented Design interview question
Algorithms
Trie Interview Patterns: Autocomplete, Word Search, and Prefix Problems (2025)
Trie Interview Patterns: Autocomplete, Word Search, and Prefix Problems (2025) Tries (prefix trees) are the go-to data structure for string
System Design
System Design Interview: How DNS Works and How to Design It
System Design Interview: How DNS Works and How to Design It Understanding DNS (Domain Name System) is fundamental to backend
System Design
System Design Interview: Design a Pastebin / Code Snippet Service
System Design Interview: Design a Pastebin / Code Snippet Service Designing Pastebin is a classic beginner-to-intermediate system design question that
System Design
System Design Fundamentals: CAP Theorem, Consistency, and Replication
System Design Fundamentals: CAP Theorem, Consistency, and Availability Understanding distributed systems fundamentals is essential for any system design interview. These
System Design
System Design Interview: Design a Real-Time Leaderboard (Top-K System)
System Design Interview: Design a Real-Time Leaderboard (Top-K System) Real-time leaderboards rank users by score and are common in gaming,
System Design
System Design Interview: Distributed Transactions (2PC, Saga Pattern)
System Design Interview: Distributed Transactions (2PC, Saga Pattern) Distributed transactions are one of the hardest problems in distributed systems. When
System Design
System Design Interview: Design an Email System (Gmail)
System Design Interview: Design an Email System (like Gmail) Designing an email system covers distributed storage, message queuing, full-text search,
Algorithms
2D Dynamic Programming Interview Patterns (2025)
2D Dynamic Programming Interview Patterns (2025) Two-dimensional DP problems are common at Google, Meta, Amazon, and Microsoft. They involve grids,
System Design
System Design Interview: Design a Maps and Navigation System (Google Maps)
System Design Interview: Design a Maps and Navigation System (Google Maps) Designing a maps and navigation system is asked at
System Design
System Design Interview: Design a Feature Flag System
System Design Interview: Design a Feature Flag System Feature flag (feature toggle) systems allow engineers to enable or disable features