Time Wizard RxJS - No to setTimeout! Solve all asynchronous tasks at once

Want to break through the barriers to entry that are reactive programming? Kevin's easy-to-understand RxJava will empower you to overcome them.

Apps play an important role in our daily lives. However, the process of developing and maintaining native apps is long and complex, and can be quite costly. This course introduces Progressive Web Apps (PWA), an alternative that has been gaining attention as of September 2024. PWA combines the advantages of web technology and native apps, enabling faster and more efficient app development and maintenance. Through hands-on practice, you'll learn the concepts, advantages, and implementation methods of PWA step by step, and develop the skills to apply them directly in real-world scenarios.

This course is designed to help students understand React deeply and apply it confidently in real-world projects. Through years of teaching and mentoring, I’ve noticed that many learners struggle with React because they jump between tutorials without understanding the fundamentals or how everything connects in a real application. In this course, I solve that problem by teaching React step by step, starting from the basics and gradually moving toward advanced concepts. Every topic is explained clearly, then applied immediately in practical projects. I focus on best practices, clean code, and real development workflows, so students don’t just learn React — they learn how to think like React developers. By the end of the course, students will have built three complete, production-style applications and will feel confident creating and deploying their own React projects.

For job seekers who have created a portfolio as a backend developer but have nothing to show but an API, we will provide the experience of adding a frontend to create a web service.

This course covers the Critical Rendering Path (CRP) process from start to finish, where the browser receives HTML to create the DOM, combines it with the CSSOM, and renders pixels on the screen. Beyond simple DOM manipulation, you'll learn how CSS and JS impact performance, image and font optimization, Lazy Loading, Intersection Observer, virtual lists, and DevTools practice, gaining practical strategies to noticeably improve real web performance.

This course is for developers who have already used programming languages (Java/Python/Swift/Kotlin, etc.). It is a lecture designed to quickly learn JavaScript in one hour. Although we are in an era of coding with AI, human developers must supervise AI code. Therefore, this lecture aims to quickly build the minimum knowledge needed for supervision.

We deal with ideas. You can logically organize the core and fundamentals of JavaScript. You can structure your own JavaScript experiences and thoughts. You can establish the technical logic of JavaScript. You can broaden your perspective to see the entirety of JavaScript. You can prepare for JavaScript technical interview questions.

Build a solid foundation and confidence by developing a variety of topics from scratch with JavaScript.

This course is a series of courses on functional programming and JavaScript ES6+, covering a variety of application cases.

You can learn the basics of React. You can organize HTML, JavaScript, DOM, Event, Object, Module, OOP, etc. related to React.

This course is designed for developers who are new to functional programming, and is comprised of theory and practice to help them gradually change their existing way of thinking.

This course explores microservice architecture and distributed environments not as a simple list of technologies, but from a 'design perspective' required in actual work and interviews. Starting from the differences between monolithic and MSA, it progressively covers incremental migration strategies, modular monoliths, clean architecture and hexagonal architecture, clearly explaining why each choice is necessary and the trade-offs involved. Through hands-on practice, you can directly verify the intent of the structure and learn about core issues inevitably encountered in distributed environments—such as data consistency, transactions, inter-service communication, and failure handling—through realistic scenarios. Based on actual questions and perspectives from Kakao interviewers, this course aims to go beyond simple knowledge acquisition and elevate your way of thinking about distributed systems to the next level.

This course goes beyond simply using Express.js. You will rebuild its internal engine from start to finish, gaining hands-on experience with the real principles of how a server works. By directly creating each component of Express—such as routing, middleware, request–response objects, static file handling, and template rendering—you will grow as a server developer and truly understand how a framework operates at its core.

Hear essential insights for developer career growth from the top 1% of developers.

This is a practice-focused problem-solving course for JavaScript beginners and novices. It is structured so that you can naturally learn core concepts and internalize grammar by solving over 1,500 step-by-step problems on your own.

This course goes beyond just using Express.js—you'll implement its internal engine from scratch to truly understand how real servers work. You'll gain hands-on experience growing as a server developer by building all of Express's components from the ground up, including routers, middleware, request-response objects, static file handling, and template rendering.