CrackingWalnuts
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DSA Templates
35Algorithm patterns & code templates
System Design
38End-to-end architecture problems
Low Level Design
67Design 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: News Aggregator (100K Sources, Dedup, Personalized Ranking)
System Design
Apr 5, 2026 · 86 min
System Design: Dropbox (File Sync, Chunking, and Deduplication)
System Design
Apr 2, 2026 · 69 min
System Design: Object Storage (Erasure Coding, Flat Namespace, and Exabyte Scale)
System Design
Mar 31, 2026 · 54 min
Leadership
ManagerBuild vs Buy Framework
“Compare total cost of ownership over 3 years, including maintenance, integration, training, and opportunity cost”
Org Design
EnterpriseSecurity Team Integration
“Application Security (AppSec), Security Operations (SecOps), and Governance/Risk/Compliance (GRC) are three distinct functions that require different skill sets, tools, and team structures. Treating security as one monolithic team breaks down past 5-6 people”
530+Articles
27Interactive Tools
16Categories
6Learning Stages
Learning Path
Discover Today
Spark
The Swiss Army knife of distributed data processing, for better or worse
Serverless & FaaS
Run code without managing servers. The cloud provider handles provisioning, scaling, and patching.
Bloom Filters & Probabilistic Membership
Answers 'is this element in the set?' with zero false negatives and a tunable false positive rate. If a Bloom filter says no, the element is definitely not there. If it says yes, the element is probably there