Notes

Study notes, book highlights, system design reference sheets. Medium-length, structured, not as polished as essays.

3 posts

April 2026

Scaling Reads

Every lever for serving millions of reads per second — replicas, caches, fan-out, denormalization, CQRS — with case studies from Twitter, Netflix, and Discord.

#System Design#Caching#Replication#CQRS 24 min read

Apr 22

note

Database Indexing

B-tree, LSM, hash, geospatial, inverted — which index to reach for, why, and the trade-offs an interviewer expects you to name. With SQL and production examples.

#Database#Indexing#PostgreSQL#Elasticsearch 19 min read

Apr 20

note

Networking Essentials

Networking for system-design interviews: layers, TCP/UDP, HTTP versions, REST vs gRPC, WebSocket/SSE, load balancing, CDN, and resilience. Diagrams + Go code.

#DNS#HTTP#Network#TCP 62 min read