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
API Performance P95 7s → 0.1s Backend Optimization — Finding the Bottleneck Was Harder Than Fixing It
Hi, I’m Jeongil Jeong, a backend developer working at a proptech platform. One day, as usual, I was checking the Grafana dashboard for monitoring. The average response times were mostly within a few h...
March 4, 2026
CI Took 45 Minutes After Switching to Modular Monolith - Optimizing Our Spring Test Pipeline by 77%
Hi, I’m Jeongil Jeong, a backend developer working at a proptech platform. In a previous post, I wrote about how I, as the sole remaining backend developer, consolidated 13 microservices into a modula...
February 27, 2026
MSA Was Too Much for Us - Our Journey to Modular Monolith
Hello. I’m Jeongil Jeong, a backend developer working at a proptech platform. Our company had successfully completed a zero-downtime migration from a legacy Java Servlet monolithic service to MSA and ...
February 20, 2026
The Ever-Changing AI Coding Agent Ecosystem: oh-my-opencode, oh-my-claudecode, OpenClaw, Agent Teams
Hello. I’m Jeongil Jeong, a 3rd-year backend developer working at a proptech platform. The AI coding tool ecosystem has been changing incredibly fast lately. A tool that was trending a few days ago ge...
February 9, 2026
3AM Error Alerts? Let AI Fix Them: Automating Error Response with OpenClaw
Hi, I’m Jeongil Jeong, a 3-year backend developer working at a proptech platform. TL;DR I automated 3AM error alert responses with OpenClaw. Using Loki/Tempo polling + Telegram Forward hybrid appr...
February 6, 2026