[Beginner] Ruby on Rails 8 Introduction Course for Indie Hackers

Why Rails?

Rails is used by major domestic startups like Karrot, MyRealTrip, Remember, Upbit, and Kakao, as well as Silicon Valley giants like GitHub, Shopify, Airbnb, and Twitch.

One or a small number of developers can quickly develop full-stack from front-end, back-end, database to deployment, making it a great tech stack for monetization not only for startups but also for solo developers such as indie hackers and solopreneurs.

Especially recently, it works really well with AI editors like Cursor and Windsurf. Since it's full-stack, it can create features spanning frontend, backend, and database with just a single prompt.

(See Rails and AI usage video)

https://www.youtube.com/watch?v=ByW7MuZmicM

I've used backend languages like Java, Python, C#, and PHP; native app languages like Swift and Kotlin; frontend languages like React, React Native, and Svelte; backend frameworks like Next.js and Nest.js; and database technologies like TypeORM, Prisma, and Supabase. As a computer science major at Yonsei University, I also experienced languages like C/C++ and Assembly during my undergraduate years, as well as now-defunct technologies like Flash, Flex, and ActionScript.

Among these, the only technology that I love, still use today, and continues to evolve with a consistent philosophy is Ruby on Rails. Unlike technologies where the language and syntax change drastically over time or need to be discarded when they go out of fashion, code written in Rails 5 years ago still works well today.

Why the latest Rails 8?

The latest version of Rails comes with Hotwire, which allows you to build dynamic screen transitions and animations without using frontend stacks like React and with minimal JavaScript code.

WebSocket functionality for real-time chat, queue functionality for handling time-consuming batch jobs or asynchronous processing, caching functionality that works fine even with many users, and more are built into Rails 8

You don't need to use separate libraries or external paid services for websockets, queues, and caching, and it works right away without requiring any additional infrastructure setup.

And by optimizing the performance of the file-based Sqlite3 database so it can be used in production without issues, there's no need for separate database server setup, allowing for rapid development and deployment while making management easier.

Why this course?

Out of my 20 years of development experience, I've been using Ruby on Rails since 2007, for 17 years. I used Ruby on Rails at the startups I worked for, the startup I founded, and the development agency I ran for startups.

The startups I worked at were acquired by global commerce companies or listed on KOSDAQ, and the development agency I ran generated 8.5 billion won in revenue by developing client projects using Rails.

By developing with Rails, we were able to quickly train junior developers and develop rapidly, achieving a profit margin of 30-40%. This was an unprecedented profit margin in the agency industry where even 10% profit is difficult to achieve.. Đây là tỷ suất lợi nhuận chưa từng thấy trong ngành agency, nơi mà ngay cả 10% lợi nhuận cũng không dễ dàng.

Based on my experience training over 100 junior developers and the know-how gained from developing more than 350 platforms, I'll be sequentially releasing courses that get straight to the point without being verbose. After this introductory course, I plan to release advanced courses and practical courses in succession., tôi sẽ lần lượt mở các khóa học chỉ truyền đạt cốt lõi mà không dài dòng. Sau khóa học nhập môn này, tôi dự định liên tiếp mở khóa học nâng cao và khóa học thực chiến.

The features of this course

📌 Know-how from a 20-year veteran developer who has built services firsthand

📌 Learn the productivity that generated 8 billion in revenue with a single technology

📌 Covers frontend, backend, database, and deployment comprehensively

📌 This course is for Rails beginners, but it will be easier to understand if you have web development experience

We recommend this for

After taking the course

• You'll understand the MVC structure and be able to develop CRUD operations

• You'll learn how to manage databases and add tables and columns

• You'll learn how to deploy services to a standalone server using Docker

  
  

Who created this course

• 2025 Solopreneur, indie hacker creating SaaS and courses

• 2018 - 2024 Accumulated 8.5 billion KRW in revenue as a startup-specialized development agency

• 2017 Solo freelance developer with annual revenue exceeding 200 million won

• 2013 Founded a startup

• 2012 Startup Development Team Lead, CTO

• 2002-2012: Majored in Computer Science at Yonsei University

Notes Before Taking the Course