StefKang's Tech Notes

Backend architecture, distributed systems, and performance optimization

Building a High-Throughput Message Queue in Go

August 2026 · GoSystems

Exploring lock-free data structures, zero-copy I/O, and goroutine pool patterns for 1M+ msgs/sec throughput...

PostgreSQL Query Optimization: A Case Study

July 2026 · DatabasePostgreSQL

How we reduced a 45-second query to 120ms with covering indexes, partial aggregates, and CTE refactoring...

Kubernetes Resource Tuning for Microservices

June 2026 · K8sDevOps

Right-sizing requests/limits, HPA tuning, and pod density optimization across 200+ services...