ぶらぶらしていた就活生の就職話とサーバー最適化およびシステムデザイン

Learn how to design and process large-scale data architecture that handles hundreds of billions of data records using only pure SQL and MySQL's core features, together with a Toss developer who handles hundreds of billions of financial traffic transactions and a developer who started as a non-major and is now developing platforms in Pangyo.

We will develop a scalable order processing system capable of real-time event streaming using Spring Boot 3.x + Kotlin to build a Kafka cluster, leveraging PostgreSQL CDC with Debezium Connect and Apache Avro schema.

Using Spring Boot 3.x + Kotlin, we build a 3-instance cluster, and utilizing Redis Pub/Sub distributed messaging and an Nginx load balancer, develop a scalable WebSocket real-time chat server capable of handling large-scale traffic.

This covers effective Redis usage, including precautions and applications, illustrated with examples from real-world practice or renowned historical cases.

This course is a master class that systematically covers the fundamental principles and practical applications of MongoDB. Starting with core MongoDB concepts, you will systematically learn essential topics for practical work, such as database design, CRUD operations, indexing, aggregation pipelines, performance optimization, transactions, and security. It explains topics step-by-step so even beginners can understand, and you can deeply learn the working principles of MongoDB through exercises and examples. This is the best introductory and practical course for developers who want to build strong MongoDB skills for practical work.

This course covers how to set up multi-module projects from scratch using Kotlin and Spring Boot. It proceeds with a hands-on approach, covering everything from the basic concepts of modularization to Gradle configuration, managing dependencies between modules, and actual application development. If you are a beginner or intermediate developer looking to learn the fundamentals and practical application of multi-modules, please refer to this course.

This course is a master class that teaches Kotlin's 🌺 Coroutine, covering everything from theoretical foundations to practical application in a standard manner. It systematically covers core principles and structure, the necessity of asynchronous programming, Coroutine builders and scopes, exception handling, channels, Flow, and other key features frequently used in practice, step by step. Each concept is explained with hands-on examples, making it easy for beginners to understand and immediately apply them. This is the best introductory and practical course for developers who want to build strong Coroutine skills for real-world use.

Kotlin mastery via virtual payment server course.

Let's build a project using Ktor, the most popular project in Kotlin, and master Kotlin! 😆

You can learn about JWT and ws communication using Spring Boot, and how to handle high TPS.

In this course, rather than covering the theory directly, you will learn how to use Redis effectively in your code through hands-on practice.

You can learn how to send emails using AWS and Spring. Through this, you can study how to create an email verification system.

I've created the 'MySQL Performance Optimization Intro/Practical (SQL Tuning Edition)' course, easy for non-majors to understand and immediately applicable in practice!

Learn the fundamentals of SQL and databases essential for practical work. Not only developers, but also planners and data analysts learn SQL in depth.

Trying to get a job, but it's not easy, is it? I, a liberal arts non-major and academy graduate, will share the 'effective portfolio' that I personally struggled for 'n' months to widely open the door to employment.

This course covers how to create web applications using Node.js and MySQL.

Just listen. The lecturing skill, captivating power, and lecture quality are different.

Not only developers, but also planners and data analysts learn databases step-by-step, starting from SQL basics.

There are so many benefits to developing Spring Boot with Kotlin. I think it would be good to learn about them through this lecture.

I've created a 'Redis Introduction/Practical (Query Performance Optimization)' course that non-majors can easily understand and immediately apply in practice!

Learn the deployment process in the following order: Manually deploy Spring Boot with Chicken Combo value -> Deploy with Docker -> Github Action CI/CD.

Create your own visual novel game using React, Javascript, SpringAI, and Springboot. Learn how to create a web-based visual novel game using SpringAI and React!

Understanding Spring Boot + React.js Login (+Social) Service is a course designed to help you deeply understand the authentication flow between frontend and backend, by directly implementing a practical login system that includes JWT-based authentication and social login (Kakao/Google). The frontend is built on React.js, and the backend on Spring Boot, enabling you to learn step by step the practices used in real service environments, such as the Access Token + Refresh Token approach, user state management using HttpOnly Cookie and Redux, Role-based authorization, and social login integration.

Full 40-hour Spring-based Full-stack Web Development Completely Free Course

Springboot + React RestAPI Bulletin Board Creation: Learn Faster Than Anyone Develop a CRUD server with Springboot and create your own board with React!

API server built with Spring Boot (Spring Boot ver3.4.x) and React 19 (with TypeScript) Completing the integration project! Producing the entire portfolio writing bootcamp as lectures.

Handling media (video, audio) on the web is now easier than ever! Learn the MediaStream API and WebRTC by following along step by step.

I've created a beginner-friendly and practical 'Introduction to Elasticsearch' course!

Build a Springboot + iOS RestAPI Bulletin Board: Learn Faster than Anyone Develop a CRUD server with Springboot and create your own bulletin board with iOS!

This course teaches you how to implement modern web applications that combine the accessibility of the web with the excellent information management capabilities of a database by linking PHP and MySQL.