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Authentication vs. Authorization vs. OAuth: The 'ID Card' Mental Model
Stop mixing up 401 and 403. A mastery guide to AuthN (Who you are), AuthZ (What you can do), and the OAuth Valet Key.
Consistent Hashing: The 'Locker Room' Mental Model
How does Cassandra know which server stores your data? Master consistent hashing, virtual nodes, and scaling distributed systems reliably.
Docker vs. Kubernetes: The 'Hotel Manager' Mental Model
Why do I need K8s if I have Docker? A mastery guide to understanding Containers (Robots) vs Orchestration (The Manager).
Latency vs. Throughput: The 'Water Pipe' Mental Model
Why is your API slow even though your internet is fast? A mastery guide to P99 latency, bandwidth, and finding the bottleneck.
Load Balancer, Reverse Proxy, API Gateway: The Grand Hotel Mental Model
Confused by the 'Traffic Trio'? A mastery-level guide to Load Balancers, Reverse Proxies, and API Gateways - from mental models to Nginx configs.
Monolith vs. Microservices: The 'Mansion vs. Village' Mental Model
Is Microservices mostly hype? A mastery guide to the 'Distributed Monolith', Latency taxes, and knowing when to split.
Partitioning, Bucketing, Sharding, Replication, Edge: The Clean Mental Model
A precise mental model for partitioning, bucketing, sharding, replication, and edge computing - when to use each and why they exist at different layers.
SP7 - Proxy - Learn Design Pattern From Simple Things
The boss blocks social media so employees stay focused. That's exactly how the Proxy pattern works - controlling access between objects.
SQL vs. NoSQL: The 'Library vs. Warehouse' Mental Model
Why is MongoDB faster but Postgres safer? A mastery guide to Schema, ACID, and why JSONB might be the only NoSQL you need.