CrackingWalnuts
Today's Lineup
Pattern Pick
Greedy (Intervals & Scheduling)
DSA TemplateIntermediate
ExploreDesign Blueprint
Pastebin
Low Level DesignIntermediate
ExploreScale Study
Design Object Storage
System DesignHard
Deep divePacket Probe
IP Addressing & Subnetting
Networking & ProtocolsIntermediate
ExploreStaff+ Prep
Organizational Design Questions
Staff+ InterviewExpert
ExploreKernel Dive
BIO & Request Queues
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
ManagerIncident Response Leadership
“The Incident Commander role exists to coordinate communication, not to be the person who fixes the problem”
Org Design
GrowthRemote-First Org Design
“Remote-first is not the same as remote-friendly. Remote-first means every process, meeting, and decision is designed for distributed participants by default. If your office employees have an information advantage over remote ones, you're remote-friendly at best”
530+Articles
27Interactive Tools
16Categories
6Learning Stages
Learning Path
Discover Today
VictoriaTraces
Distributed tracing built on the same engine as VictoriaLogs, without the external storage tax
Secrets Management
Centralized secret storage with encryption at rest and fine-grained access control
Skip Lists
A skip list is a layered linked list where higher layers skip over multiple elements, giving you O(log n) search, insert, and delete on a data structure that is conceptually much simpler than a balanced binary tree