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[Lv1] Spring Boot You Can 'Explain' in Interviews - Backend Development Answered Through Experience

A backend development introductory course where you learn through understanding rather than memorization, and experience rather than theory. Instead of answering the interview question "What is JPA?" by reciting a Googled definition, this course enables you to start with an experience-based answer like "I've been through JdbcTemplate hell..." You'll directly experience the process of reducing pure Java ServerSocket from 30 lines to Spring Boot's 7 lines, understanding with your whole body "why we use frameworks." After 6 sessions, you'll have a working portfolio in your hands: a Todo List REST API implemented with Spring Boot + JPA.

1 learners are taking this course

dingcodingco

실습 중심

백엔드이해하기

신입백엔드

Spring

Spring Boot

hibernate

What you will gain after the course

The ability to answer with "experience" in backend interviews
Spring Boot + JPA Practical Development Skills
Learning Experience of Embodying "Why"
The ability to read production code
# Tech Stack Required by 95% of Entry-Level Backend Developer Job Postings

Spring, if you learn it this way, you'll fail the interview

I'm playing the lecture and following along.

@RestController added, @GetMapping added... Oh, it works? Portfolio complete!

But in interviews, they ask like this

"What is JPA?"

"Um... database with Java... ah... that thing..."

It falls.

"Have you done a Spring Boot project?"

"Yes! I followed along with a YouTube video... but honestly, I don't really understand why IoC is necessary..."

You find yourself unable to explain a project created through copy-paste.

Most Spring courses only teach "how to use it".

"You can use JPA like this. Just call save()."
"For transactions, just add @Transactional."

If you follow along, it works. You'll also create a portfolio.

But the interviewer asks "Why?"

"Why do we use JPA?"

"Why do we need transactions?"

"Why do we separate Controller and Service?"

A person who has only learned "How" answers like this

"JPA is an ORM... and when you use save(), it saves the data..."

That's it. I have nothing more to say.

I've never experienced it before. Since I've never done it without JPA, I don't know why JPA is necessary.

So this course gives you "pain" first

To properly learn Spring, you shouldn't learn the convenient things first. You need to experience the inconvenient things first.

When you create a web server with pure Java, it's 30 lines. You have to write the HTTP response directly by hand. As a string. You literally type "HTTP/1.1 200 OK".

After going through this pain, when you look at Spring Boot? It's done in 7 lines. The same thing runs.

At this moment, it becomes clear: "Ah... this is why we use Spring Boot"

JPA is the same. Without JPA, you have to write SQL strings directly when connecting to the database, and the code just to convert query results into Java objects is 50 lines.

This "pain → salvation" experience makes you "a developer who can explain".

✨ Features of This Course

📌 I endlessly ask "Why?"

This course doesn't end with "do it this way."

Regular lecture: "JPA is an ORM. Just use save()." (X)

This course: After experiencing the hell of 50 lines of SQL + RowMapper with JdbcTemplate firsthand,

Why JPA's single line save() is revolutionary - a bone-deep realization

Every concept starts with "Why was this technology created?" Once you grasp the Why, the How naturally follows.

📌 "Pain → Salvation" Learning Method

This is not a lecture that simply tells you the answer. It deliberately makes you experience the pain, then lets you feel the greatness of the solution.

Period 2: Parsing HTTP with 30 Lines of ServerSocket, Finishing with 7 Lines of Spring Boot

Period 3: JdbcTemplate SQL + RowMapper Hell → JPA save() One Line

Period 4: "I didn't write any code, so why is it running?" Perfect Understanding with the Confusing Proxy Pattern

Period 5: From Overworked Controller Doing Everything to Clean Architecture with 3-Layer Separation

This experience enables you to start your interview answers with "I've personally experienced this..."

You will be able to explain Spring, Spring Boot, JPA, and Hibernate.

📌 How to Answer in a Way That Encourages Follow-up Questions from the Interviewer

Lectures that just throw concepts at you and end there, lectures where you don't know how to use them in interviews... I hated those kinds of lectures the most.

This course connects concepts → hands-on experience → interview answers.
(The image below shows interview questions that were actually asked, from the Backend Resume Differentiation course)

🗺️ This course is Lv.1

This course is a starting point. I'm creating a backend developer roadmap based on this.

Lv.0 Database Core Concepts: Building Foundations Before Starting Spring

Lv.1 Introduction to Spring Boot (This Course) Creating APIs with Spring, Interview Preparation

Lv.2 Deployment (AWS, CI/CD) Publishing to the Real World Beyond localhost

Lv.3 Becoming a Developer Who Doesn't Shake When Deploying to Production

Lv.5~6 Architecture & Real-world ProjectMSA, DDD, E-commerce System Development

Let's start with this course and go through it step by step together!

🎁 EVENT 2 🎁

IntelliJ IDE 3-Month Free License Provided!

To support your development studies, we've prepared special benefits through our collaboration with JetBrains.
With the promotion code below, you can use IntelliJ for free for 3 months!

✅ Promotion Code: HYUNJOONPARKxJB
✅ Benefits: 3-month free license for a single JetBrains IDE (e.g., IntelliJ, PyCharm, WebStorm, etc.)
✅ Valid Until: May 13, 2026
✅ How to Use😀

1. Access the official JetBrains coupon registration page

2. Select your preferred IDE after entering the code

3. Check the license issued via email

⚠ Warning:
This code is only available for new users who are using JetBrains for the first time.
(Only those who have never used a paid JetBrains license before can register)
(You can do this infinitely by creating new Google emails)

Recommended for
these people

Who is this course right for?

Someone who knows Java basics (if, for, class) but finds it vague how to actually build a 'server' with this knowledge
Someone who got the code running by following YouTube tutorials but can't explain it in interviews
# New Graduates Intimidated by "Spring Boot, JPA Experience Preferred" in Job Postings
I read a Spring Boot book but can't apply it in real-world situations
I completed a development bootcamp, but I only know "how" without understanding "why"

Need to know before starting?

Basic Java syntax level (completing one introductory Java course is sufficient)
Database Knowledge (Free educational materials provided when participating in the course review event!)

Hello
This is

11,137

Learners

1,205

Reviews

233

Answers

4.9

Rating

Courses

🚀 토스, 포항공대 출신 | 백엔드 8년
🎥2만 유튜버 | 개발 콘텐츠 제작
📚 인프런 강사 | 누적 수강생 8,000+
👥 개발자 취업 커뮤니티 운영 중 (8,000+)
🧩 오픈소스 (Gradle, Spring AI 등) 다수 Contributor
📝38개 서류 합격 및 크몽 이력서 첨삭 100+회 이상 경험 (평점 5.0점)

코딩을 뒤집다, 딩코딩코. 쉽고, 연역적으로 이해되는 지식을 전달합니다.

인프런 인터뷰 링크!

Curriculum

All

40 lectures ∙ (3hr 18min)

Section 1. [Period 1] Fundamentals of Web Backend - From the Internet to JSON

6 lectures ∙ (59min)

Section 2. [Session 2] My First Web Server - From Hello World to API

5 lectures ∙ (56min)

7. 2-1. 🚀 Launching My First Web Server: Experiencing the Terrible Pain of Pure Java
22:21
8. # 2-2. 🌱 Creating a Spring Boot Project: As Quick as Instant Ramen in 3 Seconds
10:36
9. 2-3. 🎯 Creating a Hello World API: Complete Server in 7 Lines of Code
11:05
10. 2-4. 📤 Creating JSON Responses: The Magic of Transforming Java Objects into JSON
08:05
11. 2-5. 🎯 Handling Dynamic Requests with Path Variables: Processing Hundreds of Millions with a Single Method
04:50

Section 3. [Session 3] Database Connection - From Memory to JPA

5 lectures ∙ (1hr 22min)

12. 3-1. 💾 Storing Data in Memory: The Fatal Limitation of HashMap
12:14
13. 3-2. 🗄️ Database Concepts: Installing a Permanent Storage Refrigerator
14:44
14. 3-3. 😭 Saving to DB with JdbcTemplate: Experiencing SQL String Hell
22:53
15. 3-4. ✨ Saving to DB with JPA: Done in One Line with save() - No SQL Needed
15:44
16. # 3-5. 🎮 Creating a Repository: A Control Panel That Works Without Writing Code
16:47

Section 4. (To be released in December) [4th Period] Dissecting Spring's Magic - From Proxies to DI

9 lectures

Section 5. [Session 5] Layer Separation and Transactions - Completing a Secure Backend

5 lectures

Section 6. [Session 6] Finishing Like a Pro - From Exception Handling to Real-World Projects

10 lectures

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[Lv1] Spring Boot You Can 'Explain' in Interviews - Backend Development Answered Through Experience

What you will gain after the course

Spring, if you learn it this way, you'll fail the interview

Most Spring courses only teach "how to use it".

So this course gives you "pain" first

✅ Here's what you'll learn.

🍽️ Understanding Backend Concepts Through a Restaurant Analogy

🌱 Courses for Complete Beginners

✨ Features of This Course

📌 I endlessly ask "Why?"

📌 "Pain → Salvation" Learning Method

📌 How to Answer in a Way That Encourages Follow-up Questions from the Interviewer

We recommend this for:

🗺️ This course is Lv.1

🎁 EVENT 🎁

We will give this problem book to the first 100 people who write a course review!

🎁 EVENT 2 🎁

The person who created this course

Notes Before Enrollment

Practice Environment

Learning Materials

Prerequisites and Important Notes

Recommended for
these people

Hello
This is

Curriculum

Reviews

dingcodingco's other courses

Similar courses

[Lv1] Spring Boot You Can 'Explain' in Interviews - Backend Development Answered Through Experience

What you will gain after the course

Spring, if you learn it this way, you'll fail the interview

Most Spring courses only teach "how to use it".

So this course gives you "pain" first

✅ Here's what you'll learn.

🍽️ Understanding Backend Concepts Through a Restaurant Analogy

🌱 Courses for Complete Beginners

✨ Features of This Course

📌 I endlessly ask "Why?"

📌 "Pain → Salvation" Learning Method

📌 How to Answer in a Way That Encourages Follow-up Questions from the Interviewer

We recommend this for:

🗺️ This course is Lv.1

🎁 EVENT 🎁

We will give this problem book to the first 100 people who write a course review!

🎁 EVENT 2 🎁

The person who created this course

Notes Before Enrollment

Practice Environment

Learning Materials

Prerequisites and Important Notes

Recommended for these people

HelloThis is .css-1q3zd4q{text-decoration-line:underline;text-underline-position:under;text-underline-offset:1px;}

Curriculum

Reviews

dingcodingco's other courses

Similar courses

Recommended for
these people

Hello
This is