CrackingWalnuts
Today's Lineup
Pattern Pick
2D Dynamic Programming
DSA TemplateIntermediate
ExploreDesign Blueprint
ORM Data Mapper
Low Level DesignAdvanced
ExploreScale Study
Design a News Aggregator
System DesignMedium
Deep divePacket Probe
HTTP/3 — UDP Takes Over
Networking & ProtocolsAdvanced
ExploreStaff+ Prep
Legacy System Modernization
Staff+ InterviewAdvanced
ExploreKernel Dive
Zero-Copy Networking (sendfile, splice)
Linux InternalsAdvanced
Deep dive
Explore
DSA Templates
35Algorithm patterns & code templates
System Design
41End-to-end architecture problems
Low Level Design
90Design patterns & practical code
Key Technologies
59Deep dives into core tech
Infrastructure
35Production systems & operations
Networking & Protocols
51TCP, HTTP, TLS, DNS & more
Distributed Systems
38Consensus, replication & more
Linux Internals
84Kernel, networking & system calls
Cheat Sheets
24Quick reference cards for interviews
Recent Posts
System Design: GitHub (200M Repos, Git Object Storage, Sparse Trigram Code Search, Per-Job VM CI)
System Design
Apr 23, 2026 · 69 min
System Design: Online Auction (50K Bids/sec, Effectively-Once Settlement, Anti-Sniping)
System Design
Apr 17, 2026 · 83 min
System Design: Job Scheduler (10M Jobs/day, DAG Dependencies, Effectively-Once Execution)
System Design
Apr 15, 2026 · 61 min
Leadership
ManagerEngineering Roadmaps
“Outcome-based roadmaps outlast feature-based ones. Define what success looks like, not just what to build”
Org Design
GrowthML & AI Team Structure Patterns
“Three organizational models exist for ML teams: centralized, embedded, and hybrid. Once you get past 5 ML engineers, hybrid tends to scale best because it balances specialization with product proximity.”
530+Articles
27Interactive Tools
16Categories
6Learning Stages
Learning Path
Discover Today
VictoriaLogs
The log database that indexes everything without the Elasticsearch bill
Rate Limiting & Throttling
Caps request rates to protect services from abuse, DDoS, and resource exhaustion
Saga Pattern
A saga is a sequence of local transactions where each step has a compensating action. If step 3 fails, steps 2 and 1 are rolled back by running their compensating actions in reverse order. This gives you eventual consistency across services without locking resources