CrackingWalnuts
Tutorials
Step-by-step guides on system design patterns, data engineering, and building scalable architectures.
System Design: Job Scheduler (10M Jobs/day, DAG Dependencies, Effectively-Once Execution)
System Design
Apr 15, 2026 Β· 61 min
System Design: LeetCode (Code Sandbox, Container Isolation, Real-Time Contests)
System Design
Apr 12, 2026 Β· 68 min
System Design: URL Shortener (10B Short URLs, 100K Redirects/sec)
System Design
Apr 11, 2026 Β· 42 min
System Design: Ad Click Aggregator (10B Clicks/day, Lambda Architecture, Fraud Detection)
System DesignData Engineering
Apr 10, 2026 Β· 70 min
System Design: Ad Exchange (Real-Time Bidding, Sub-100ms Auctions, DSP/SSP, Impression Serving)
System Design
Apr 10, 2026 Β· 59 min
System Design: E-Commerce Flash Sales (10M Users, Coupon System, One-Per-User Enforcement)
System Design
Apr 5, 2026 Β· 106 min
System Design: News Aggregator (100K Sources, Dedup, Personalized Ranking)
System Design
Apr 5, 2026 Β· 86 min
System Design: Dropbox (File Sync, Chunking, and Deduplication)
System Design
Apr 2, 2026 Β· 69 min
System Design: Object Storage (Erasure Coding, Flat Namespace, and Exabyte Scale)
System Design
Mar 31, 2026 Β· 54 min
System Design: AI Software Engineer (From Autocomplete to Autonomous App Builder)
System DesignAI
Mar 25, 2026 Β· 94 min
RAG and LLM Platform at Scale: Ingestion, Retrieval, Generation, and Evaluation for 10M Queries/Day
System DesignAI
Mar 22, 2026 Β· 105 min
Building a Multi-Tenant AI Agent Platform for Restaurant Intelligence
System DesignAI
Mar 17, 2026 Β· 109 min
System Design: Real-Time Collaborative Editor
System Design
Mar 14, 2026 Β· 86 min
Observability Platform at Scale - Metrics, Traces, Logs, and Profiles
System Design
Mar 12, 2026 Β· 114 min
System Design: Notification Platform, 100M Notifications/Second
System Design
Mar 6, 2026 Β· 79 min
Building a Fail-Safe, Scalable Top-K Streaming System
System DesignData Engineering
Feb 27, 2026 Β· 51 min
Designing a Multi-Tenant, Globally Scalable Tagging System
System Design
May 25, 2025 Β· 23 min
How Apache Iceberg powers the Data Lake and Trino Makes It Explorable
Data Engineering
Apr 8, 2025 Β· 8 min
How Apache Pinot Achieves Ultra-Low Latency Analytics for User-Facing Applications
Data Engineering
Apr 8, 2025 Β· 5 min
Embracing Domain-Driven Design: A Deep Dive into Core Concepts
Low Level Design
Apr 8, 2025 Β· 3 min