Blog

1. Introduction a. Why Hybrid Structure? The first concern that a React web developer faces when encountering React Native is, "To what extent can I reuse existing web code?" Just because you are creating a mobile app does not mean you have to rewrite every screen and business

- SXSSF, FastExcel, StreamingResponseBody Implementation Process - 1. Introduction The system developed in-house is a monitoring dashboard for a lightweight message broker platform that provides usability similar to Kafka and NATS JetStream. It monitors the Pub/Sub status of event messages and provides a function to query event entry logs. While

- Experience in issuing, consuming, and controlling duplicate requests of temporary codes to reduce direct exposure of tokens - 1. Background This work started from the process of configuring an SSO flow to enter the survey service screen without a separate manual login within the internal business system. Users had to select

In a recent project, I had the task of safely and quickly migrating large volumes of data coming from external systems into the internal master table of the system. In this process, I encountered technical limitations and how I resolved them through PostgreSQL's Stored Procedure and optimization techniques.

Bugs Caused by Mismatched Fields and Their Solutions Backend Refactoring 1. Introduction — The field names were saved in the opposite order We received a bug report indicating that the actual rules are not functioning as intended on the frontend when registering ItemRule through the survey template editor. For StateRuleHide that

1. New Feature Requirements: Data Integration and Statistical Processing Between Heterogeneous Systems Recently, a new feature has been added to the service I am in charge of. It was a function that directly fetches data dispersed across other systems, refines it to fit the purpose of our service, and intuitively

Why do SI projects always blow up at the last minute? Five major risks and realistic response strategies of SI projects experienced by field PMs SI projects usually start off similarly. During the proposal stage, the schedule seems right, and the staffing appears sufficient. The architecture looks plausible, and the

1. Introduction Vizend Dock is a front-end common module that manages user authentication information and current workspace information. It stores not only the access token and refresh token issued after login, but also the work contexts such as pavilion, cineroom, stage, and actor, and passes the necessary authentication headers

Building upon the previous theoretical discussion, this article provides a hands-on walkthrough of registering and operating Hooks in Claude Code. We will implement a basic Post-command Hook that automatically displays a notification message whenever the AI model modifies files within the project using the Edit or Write tools.

This article explores the concept and necessity of Hooks, which automatically execute tasks at specific event points by integrating with the lifecycle of Claude Code. General prompts and CLAUDE.md-based rules rely on the model’s judgment or memory, which means they have a probabilistic limitation: the AI may

Project Background and Reasons for Choosing Spring Cloud Gateway This project fully adopted a microservices architecture (MSA) to flexibly respond to rapidly changing business requirements and secure individual scalability without interference between services. It was carried out in a 'multi-vendor collaboration structure' involving numerous developers with domain

As I worked as a UI/UX developer, I have experienced the evolution of numerous modern web technologies. React, Vue.js has made the task of structuring screens significantly more convenient compared to the past, thanks to modern CSS layouts like Flexbox and Grid. However, there is one area that

1. Overview The document management system had the ability to extract data from various documents and perform additional AI processing based on that data. When a user selects multiple documents, the system is designed to convert the content of each document into Markdown format and then send it to the

1. Project Success and Communication Most developers at Nextree work within the project organization. In other words, we do not simply perform individual development tasks but collaborate with various stakeholders to move towards a single goal. So, are we successfully completing projects each time? Project success here does not simply

1. Background and Problem Situation The A project had a requirement to implement a 365-day heatmap UI to visualize user activity data on an annual basis. Initially, I thought simply about the common concept of a 'heatmap' and approached it, so I concluded that utilizing ApexCharts, which

1. The Need for Project Background and Data Integration In the modern corporate management environment, project management systems have evolved beyond simple task management tools to become the core platform for business operations. In large organizations, various decision-making processes are based on project progress status, schedules, resources, and relationship

1. Background and Problem Situation During recent project operation, a situation occurred where a specific Pod in the Kubernetes environment could not start normally and repeatedly encountered an ImagePullBackOff error. Since the existing Pods that were already running were functioning normally, it was initially judged not to be a failure

1. Overview The first concern when developing Lakey, an AI system based on RAG (Retrieval-Augmented Generation), was how much we can trust the answers provided by LLM. In the initial development stage, we simply set up the system to search documents and generate answers using LLM. However, during the

1. Introduction Background The most important factor that was considered while designing the authentication and authorization system in the project was the reliability of security. In particular, hospital systems require much stricter security standards than general services. Since we handle patient personal information and medical data, the stability and scalability

1. Background of the task The project is not simply about a few developers implementing features, but rather a collaborative process where various organizations and personnel work together. Especially in large-scale projects or environments with many stakeholders, such as hospitals, public institutions, and SI (System Integration) projects, the importance

This article provides a hands-on walkthrough of creating and running a dedicated Java Code Reviewer sub-agent in the Claude Code environment, building on the concepts and principles of the Sub-Agent architecture. Rather than manually creating and configuring agent files, we will leverage Claude Code’s built-in

This article explores Sub-agents, one of the core features of Claude Code designed to improve productivity and scalability when working with AI-assisted development workflows. As conversations grow longer, the context window—the AI's working memory—can become saturated, increasing the likelihood that earlier instructions and prompts

1. Project Background The Maro moti plugin was developed as a productivity tool that automatically generates screen-based components called Beat in the IntelliJ environment. The plugin aimed to automate the screen structure and field layout that need to be created repeatedly, thereby enhancing the developer's productivity. After

1. Why Flux? The existing business logic was operating in a sequential loop-based structure. It would iterate through a list of data, calling external APIs or databases one by one, collecting each result before proceeding to the next logic. This was a very typical structure. Initially, there weren'

1. Reasons Why Observability Needs to Be Lightweight In modern cloud and Kubernetes-based infrastructure environments, Observability has become a key element of system operations. As the scale of the service increases, the ability to observe the system's state and quickly analyze problems based on logs, metrics, and