#Architecture

2 posts

• 

  AWS Private EC2 Operations Guide Part 1: Why Private Subnet? — The ALB + NAT Gateway Standard Architecture and Sizing-Based Decision Criteria

  Apr 24, 2026

  We unpack the 'why' behind the standard pattern of placing EC2 in a Private Subnet wrapped by ALB and NAT Gateway. Public IPv4 vs Elastic IP, sizing recommendations, HA basics, and the concrete risks of putting PII-handling servers in a Public Subnet. Part 1 of a Bastion-less AWS EC2 operations series.

• 

  Spring Boot Pre-Interview Guide Part 7: Advanced Patterns

  Jan 21, 2026

  Advanced patterns and architecture — events, async processing, file handling, and multi-module