Hello!
I’m Jeongil Jeong, Backend Developer
Sharing my development journey through honest documentation of challenges faced, solutions found, and lessons learned. Thank you for visiting.
Main Sections
Blog
Recording problems I’ve encountered, solutions, and learning experiences
Documentation
Documenting development rules and references
About Me
Introducing my journey as a backend developer and tech stack
Recent Posts
What is Manticore Search? Configuration, Setup, and Practical Application
Hello. I’m Jeongil Jeong, working as a backend developer at a PropTech platform. “We need a search feature.” When you hear this, one name probably pops into most developers’ heads. That is Elasticsear...
November 25, 2025
APIs Slowing Down After Deployment: Improving JVM Cold Start Problem by 85%
Introduction Recently, our team migrated from a Docker Compose-based production environment to Kubernetes. It was a choice to properly utilize features needed in an MSA environment, such as scalabilit...
November 18, 2025
Have I Embraced the Future? - How Developers Collaborate with AI Coding Tools
Hello. I’m Jeongil Jeong, a 3rd-year backend developer working at a proptech platform. These days, the weight of AI coding tools among developers is gradually increasing. GitHub Copilot, ChatGPT, Clau...
October 25, 2025
Changed MySQL Column Type from bigint to varchar and It Got 8x Slower...! : Procedure Performance Degradation Troubleshooting
Introduction Hello. I’m Jeongil Jeong, a 3rd-year backend developer working at a proptech platform. Today, I’d like to share an interesting performance issue that occurred in our service and the resol...
October 20, 2025
From 16 Repositories to One - MSA Multi-Module Migration Story
Introduction Hello. I’m Jeongil Jeong, a 3rd-year backend developer working at a proptech platform. In March 2025, I joined the team and went through the process of converting 16 backend projects mana...
October 16, 2025