System Design Interview: Design a Multi-Region Database System
Why Multi-Region Databases? A single-region database has two critical weaknesses: latency (users in Europe querying a US database experience 150ms+ […]
System Design
Algorithms
Greedy Algorithm Interview Patterns: Intervals, Jump Game, Task Scheduler
What Are Greedy Algorithms? A greedy algorithm makes the locally optimal choice at each step, never backtracking, hoping that local
System Design
System Design Interview: Design a Streaming Data Pipeline (Kafka + Flink)
What Is a Streaming Data Pipeline? A streaming data pipeline continuously ingests, processes, and routes events in real time —
System Design
System Design Interview: Design a Geospatial Service (Nearby Search)
System Design Interview: Design a Geospatial Service (Nearby Search) Geospatial services power “find restaurants near me,” Uber driver lookup, and
System Design
System Design Interview: Design a Cryptocurrency Exchange (Coinbase / Binance)
System Design Interview: Design a Cryptocurrency Exchange (Coinbase / Binance) A cryptocurrency exchange enables users to buy, sell, and trade
Algorithms
Recursion and Memoization Interview Patterns: LCS, Edit Distance, Word Break
Recursion and Memoization Interview Patterns Memoization transforms exponential recursive solutions into polynomial ones by caching subproblem results. In Python, @lru_cache
System Design
System Design Interview: Design an E-Commerce Platform (Amazon / Shopify)
System Design Interview: Design an E-Commerce Platform (Amazon / Shopify) An e-commerce platform handles product discovery, inventory management, order processing,
Algorithms
Interval DP and Advanced Dynamic Programming: Burst Balloons, State Machine, Tree DP
Interval DP and Advanced Dynamic Programming Patterns Interval DP solves optimization problems over contiguous subarrays or subsequences. The core idea:
System Design
System Design Interview: Distributed Transactions, 2PC, and the Saga Pattern
System Design Interview: Distributed Transactions, 2PC, and the Saga Pattern When a business operation spans multiple microservices or databases, maintaining
System Design
System Design Interview: Design a Real-Time Collaborative Editor (Google Docs)
System Design Interview: Design a Real-Time Collaborative Editor (Google Docs) A collaborative editor allows multiple users to edit the same
System Design
System Design Interview: Design a Feature Flag System (LaunchDarkly)
System Design Interview: Design a Feature Flag System Feature flags (feature toggles) enable teams to deploy code to production without
Algorithms
Two Pointers and Sliding Window Interview Patterns
Two Pointers and Sliding Window Interview Patterns Two pointers and sliding window are techniques that turn O(n²) brute-force solutions into
System Design
System Design Interview: Design a Metrics and Monitoring System (Datadog/Prometheus)
System Design Interview: Design a Metrics and Monitoring System Every large tech company runs a custom metrics and monitoring platform.
Algorithms
Graph Algorithm Interview Patterns: BFS, DFS, Dijkstra, Topological Sort
Graph Algorithm Interview Patterns: BFS, DFS, Dijkstra, Topological Sort Graph problems are a staple of coding interviews. The key is
Algorithms
Segment Tree and Range Query Patterns: Fenwick Tree, Lazy Propagation, Order Statistics
Segment Tree and Range Query Interview Patterns Segment trees solve range query problems — finding the sum, min, max, or