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, Claude Code… Many developers are already using them, and there’s even talk that “you’ll fall behind if y...
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 resolution process. While solving a problem where a MySQL procedure suddenly became 8 times slower, I enc...
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 managed in individual Repositories into a multi-module structure based on a single Repository. I’d like ...
October 16, 2025
3 Ways for Developers to Quickly Adapt to a New Company
Hello. I’m Jeongil Jeong, a 3rd-year backend developer working at a proptech platform. Job changes are not easy for anyone. New codebase, unfamiliar team culture, unknown business domain… I was also at a loss when I joined a new company. Today I want to share how I adapted to the new company and the...
September 30, 2025
From No Dev Server to GitOps: My Journey of Introducing Kubernetes from Scratch
Hello. I’m Jeong Jeong-il, a 3rd-year backend developer working at a PropTech platform. Today, I’d like to share the process of migrating our MSA services, which were running on a legacy Docker environment, to a Kubernetes-based infrastructure, a journey I proposed and built from scratch. The bigges...
July 24, 2025
Is Gradual MSA Transition an Illusion? - Battling with Tightly Coupled Legacy Services
Hello, I’m Jeongil Jeong, a 3rd-year backend developer working at a proptech platform. I joined the team recently in March, and like many companies, our team was undertaking the grand journey of transitioning legacy services to Microservices Architecture (MSA) for better scalability and maintainabil...
July 21, 2025
Toby's Meetup Report: 31-Year Developer's Message on How to Live as a Developer in the AI Era
Yesterday (July 10), I attended a meetup titled [31-Year Developer’s Message on “How to Live as a Developer in the AI Era”] . It was a lecture by Toby hosted by Inflearn, and it was time where I could gain knowledge about core competencies required of developers in the AI coding era and AI collabor...
July 11, 2025
From On-Premises to Cloud - A Zero-Downtime Migration Story
Hello, I’m Jeong Jeong-il, a 3rd-year backend developer working at a PropTech platform. In this post, I’d like to share my experience migrating a monolithic server operating in an on-premises environment to the cloud (AWS), and the infrastructure automation experience using Terraform during this pro...
July 10, 2025
Service Failures Should Be Detected Before Users Report Them - Building Our In-House Monitoring System
Hello. I’m Jeong Jeongil, a 3rd-year backend developer working at a proptech platform. After joining the team in March this year, one thing that stood out was that there were areas for improvement in the team’s monitoring system. Although we were using AWS CloudWatch before, there was an issue that ...
July 4, 2025
Absence of Naming Conventions Leads to Failures
Hello, I’m Jeongil Jeong, a 3rd-year backend developer working at a proptech platform. Today I’d like to talk about the importance of naming conventions, which we know are important in software development but whose importance we tend to overlook when it comes to resource investment. Through a probl...
June 30, 2025