カカオ面接官（開発者）が教えるMSA観点での分散トランザクションパターン

This course covers RPC communication techniques that maximize performance in large-scale MSA (Microservice Architecture) environments. Going beyond simple gRPC practice, you'll learn how to implement stable and efficient inter-service communication in real production environments where hundreds of microservices operate simultaneously. Based on Golang, the course covers Protocol Buffers (proto) syntax writing, automatic code generation and service implementation, gRPC structure and advantages over existing RPC, and performance optimization strategies with a practical focus. To ensure easy understanding for non-majors and server development beginners, the course provides step-by-step explanations from RPC concepts to gRPC's internal operating principles, enabling you to develop practical skills that can be immediately applied to real services.

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.

How to Handle Explosive Traffic Growth? Learn to build resilient and flexibly scalable architectures through practical design patterns based on EDA (Event-Driven Architecture) using Kafka, Spring, CDC, and Temporal. Explained clearly and simply with real-world experience from Kakao developers, making it understandable even for non-majors. A hands-on focused course covering real-time data flow, event processing, and microservice integration all at once!

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.

Learn the essential process of building Observability in a microservices architecture (MSA) environment from basics to practical implementation. Through step-by-step hands-on practice, you'll master standardized data collection using OpenTelemetry, trace storage and search with Grafana Tempo, and visualization using TraceQL. You can learn the process of tracking service flows through distributed tracing, identifying bottlenecks, and analyzing the root causes of failures.

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

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

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.

Kotlin mastery via virtual payment server course.

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 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.

Learn the process of building data pipelines using Apache Airflow from basics to practical application. Understand Airflow's core concepts and architecture, and master advanced design patterns frequently used in practice such as dynamic DAGs, parallel processing, distributed processing, and Custom Operators through hands-on exercises. Set up a practice environment with Python and Docker, and develop practical skills to design and operate real workflows.

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

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.

I am covering the know-how on how I studied and got a job, starting as a non-major.

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.

Spring Boot, the starting point of Java web development! We will teach you the essentials step by step while making it yourself!

From the theory of Spring Boot to practice, you can learn the easiest, fastest, and most systematically with easy examples. And all the content you learn in the lecture is structured identically to the content you learn at the nationally funded academy. In addition, as of 2023.05.29, the lecture has been renewed with the latest version applied.

Pass the Information Processing Engineer Practical Exam, first try! Code and theory, we'll teach you just the essentials. Complete mastery of past questions! Systematic lectures open the door to success.

This course is designed to provide systematic learning from the basic concepts of relational databases (RDB) to foundational SQL skills. Learners will first understand the structure of databases and tables, work with SELECT statements which are the core of SQL language, and learn how to use various operators (arithmetic operators, concatenation operators). Additionally, learners will study the concept of **Functions** that are essential in data processing, and directly practice with string functions, numeric functions, date functions, and NULL-related functions through hands-on exercises, strengthening both theory and practical application simultaneously. Through this, learners will be able to go beyond simple data queries and develop foundational SQL capabilities that can be immediately applied to real-world data analysis and processing.

If you have started Java development but feel overwhelmed when trying to solve a problem, it is time to study design patterns. I will explain 10 of the GoF design patterns that I personally use the most.

You will learn various ways to design software in an object-oriented manner through the 25 patterns of OODP.

This course provides an in-depth study of multithreading and concurrency, from basic principles to practical applications.

Learn the process of converting an existing legacy monolithic system to a microservice architecture through hands-on training. You will also receive code reviews from knowledge sharers up to two times!

The SQLD Latest Past Exam Problem Solving Course is a practical preparation lecture that reflects the 2024 revised exam standards and is based on actual past exam questions. Going beyond simply checking answers, it meticulously covers the question's intent, key testing points, and common pitfalls, developing practical problem-solving skills for SQLD certification success.

Kotlin mastery via virtual payment server course.

It's time to master the various functions of Java and apply them to practical use^^ Let's make it completely ours by solving algorithm problems together. Eun-jong will be with us in Part 2 as well.

I've made a 'DB Design Introduction/Practice' lecture that's easy for non-majors to understand and immediately applicable in practice!

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

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

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

"The Era of Coding with AI: A New Productivity Paradigm for Java Developers" This course is a practical Cursor AI utilization guide for Java developers. Beyond simply copying AI-generated code, you'll learn Vibe Coding methods that maximize development efficiency through collaboration with AI. By leveraging Cursor's powerful code understanding, refactoring, and documentation features, you'll master AI coding workflows step by step that can be immediately applied to real-world projects. In an era where AI writes code for us, "developers who can effectively work with AI" now have the competitive edge. Start your upgraded development experience as a Java developer with this course.

We will develop a MSA delivery application using Docker, Docker compose, and Traefik server. In addition, we will systematically learn theoretical knowledge such as MSA, Proxy Server, Load Balancer, API Gateway, etc. that are necessary for development. All learning courses are composed of practical training, and through this, you will gain confidence in developing Docker-based applications.

This course is designed to prepare for the Information Processing Engineer practical exam using only past exam questions. Instead of unnecessary theory or extensive content, it's designed to lead directly to 'passing' by focusing on past exam questions that are repeatedly tested in actual exams. It reflects the latest exam trends, allowing you to quickly grasp key points and question patterns, and you can learn answer writing techniques through the problem-solving process. This is a course optimized for test-takers who aim to pass efficiently in a short time.

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Java is not difficult to learn. It's just that it becomes difficult because you learn too many unnecessary things. There are things in technology that can only be understood when you reach that stage. But, it's just hard because you try to cram too much unnecessary stuff into your head. Technology is experience. Let's learn quickly and simply!!