Blog

1. Introduction 1.1 Project Background The existing structure of old messaging services struggled to adapt to the changing web environment, leading to many maintenance-related shortcomings. This project, 'Loopin', was initiated with the goal of removing this Smalltalk system and rebuilding it on the latest Vizend platform

Compared Flyway, Liquibase, Bytebase, and Atlas in MSA·DDD environments and summarized what to choose based on different situations. 1. The schema keeps changing without stopping In DDD and MSA, the database schema is not a fixed asset in a cloud-native environment. It keeps changing throughout the operation of

1. Introduction The process of delivering a single screen to the user involves more steps than expected. It seamlessly connects the stages from planning, publishing requests, development, to testing. This time, I took on most of the process, excluding publishing, myself. This article reflects on the process rather than introducing

1. Overview The first challenge I faced while operating the MyData service was the response delay of the main screen that occurred during the rapid increase in user numbers. Initially, the structure did not pose a significant problem, but as the user base grew, it manifested as a noticeable delay.

1. Introduction During the project, a feature was needed for users to download estimate and document data in PDF format. Initially, it was thought that simply generating a PDF file would be sufficient, but there were several considerations during the actual review process. * Korean output support * Ease of layout modification

1. The reason for placing the quality management system in CI I am currently participating in an MSA consulting role as a DevOps engineer. When it comes to consulting, you usually think of design discussions such as service boundaries or domain separation, but the area I was in charge of

1. Industrial IoT and Data Collection Recently, IoT technology is being used for various purposes such as monitoring equipment status, analyzing production data, and remote management in manufacturing sites. Equipment such as PLCs, sensors, and robots continuously generate data, and effectively collecting and utilizing this data is one of the

1. Background In the previous article, we discussed the physical structure design based on Monorepo, and this time we will talk about how to unify code writing rules among developers who write code on top of it. As the project scale increases, it has become common for multiple developers to

1. Introduction When progressing through a project, there are many times when we realize that "we need to write test code" but end up postponing it due to scheduling pressures. I was no exception. While developing backend services, initially, I was manually verifying functionalities through Insomnia or screens

When utilizing LLMs for work, it initially seems most important to write prompts as short and clear as possible. I also thought at first that I could just shorten the sentences I input to save tokens. However, my perspective changed while using agent-type development tools like Codex. In reality,

1. Introduction: The planner designs 'processes' rather than 'screens'. In the IT industry, the role of a service planner is often misunderstood as that of someone who "sketches and draws screens". This is because tasks involving design tools to place buttons and create wireframes

1. Project Background and Technology Selection The survey service is the core service of a medical survey platform that deals with Patient-Reported Outcomes (PRO) reported directly by patients, managing the entire life cycle of surveys from defining the survey format to sending, collecting responses, and closing. Scoring, statistics, and

1. Background Devlime development was conducted in a way that multiple developers work simultaneously, each responsible for their own features and domains. Since it is based on the Vizend platform, the project structure and basic development methods were somewhat unified, and the overall architecture was well established. However, as the

1. Introduction: When does Server State become stale? When running the frontend, there are two types of reports that you will repeatedly hear from users. One is, “I just registered, but it’s not showing on the list,” and the other is the opposite, “I was idle, but the screen

Introduction Currently, I am responsible for maintaining the login and account-related screens based on Keycloak in this project. This time, I identified an issue where the initial setup screen for employee accounts switches to the regular password recovery screen upon refreshing, and I analyzed the cause. At first, I

Introduction Since joining the company, I have continued to design based on web screens. When I was assigned to the Bizend project, I continued web screen design based on the Bizend design system, and over the course of more than a year, a web-centric sensibility naturally developed. I learned

1. Introduction Implementing data modification forms through dialogs or modal screens in web application development is one of the most common yet complex tasks. Especially in structures like the 'Content Detail Modification Screen' of admin pages or dashboards, where detailed data needs to be asynchronously retrieved from backend

The classic classic of performance analysis, Heap Dump While working on a project in a K8s environment, we discovered a case where a specific pod was repeatedly restarting. To find out why the pod was restarting, we looked at the Last State property, and the cause was, of course, OOM.

1. Introduction In enterprise services, user-specific permission management is one of the most important features. After a user logs in, what menus they can view, what features they can use, and what data they can access are all determined by permission information. The ongoing service also had a structure

1. Introduction In real-time monitoring systems, it is often necessary to synchronize the metadata of calculation formulas across multiple services. In this project, we needed a functionality to publish events whenever a calculation formula was created or changed to communicate the changes to other services. In the initial implementation,

As AI-driven design tools rapidly advance, concerns about the role of designers are also growing. In the past, the core tasks of a designer were to design screens and create components. Now, we are in an era where AI can generate a significant level of UI in a short

1. Introduction: Why Are Query Keys Important? Most people start with React Query (TanStack Query) like this. useQuery({ queryKey: ['product-list'], queryFn: fetchProducts }); useQuery({ queryKey: ['product', productId], queryFn: () => fetchProduct(productId) }); useQuery({ queryKey: ['project-health', productId], queryFn: () => fetchHealth(productId) }); When there are only

- Task/Plan Harness Application - 1. Introduction The use of LLM-based coding tools in recent development tasks is increasing. I also started using Codex to improve productivity in project work. Initially, I used it in a conventional way: describing the necessary tasks in prompts, reviewing the results produced by the

Introduction: The Massive Shift in Software Paradigms The history of human technological advancement has followed a consistent rule of evolution of tools and the resulting expansion in scale. In the past, carpenters built houses relying on their skilled craftsmanship with just a hand hammer and a single saw. The architecture

With the recent advancements in AI technology, there is a significant change in the way data is utilized. In the project I am working on, there is an abundance of requirements and ideas for various functions utilizing LLM. To address the question of how to process numerous data extraction requests