[Lv1] Spring Boot You Can 'Explain' in Interviews - Backend Development Answering with Experience

Name: [Lv1] Spring Boot You Can 'Explain' in Interviews - Backend Development Answering with Experience
Price: 61600 KRW
Rating: 5 (32 reviews)

This is 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 give an experience-based answer that starts with "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, and understand with your whole body "why we use frameworks." After 6 sessions, you'll have in your hands a working portfolio: a Todo List REST API implemented with Spring Boot + JPA.

(5.0) 32 reviews

188 learners

Level Basic

Course period Unlimited

dingcodingco

Spring

Spring Boot

JPA

hibernate

Spring

Spring Boot

JPA

hibernate

Reviews from Early Learners

5.0

창근

33% enrolled

I ended up taking this course almost by force (?) because my company suddenly started using Spring, but looking back, I don't know what I would have done if I hadn't taken it. I wasn't a complete beginner to backend development, as I had experience with NestJS, so I was worried that Spring might feel too heavy or frustrating. However, those worries were completely shattered from the very first lecture. The flow—from Spring's philosophy to its architecture and why it was designed this way—was so smooth that I lost count of how many "Aha!" moments I had. It doesn't just list syntax; it builds the practical intuition and fundamentals needed in the field. Even coming from a NestJS background, it was great to understand Spring by comparing the two. I can confidently say that for those new to Spring, as well as those like me who have experience with other frameworks but have never properly learned Spring, this single course will completely wash away any vague fears you have. It's hard to find a better course than this for solidifying your fundamentals.

5.0

김민구

39% enrolled

This would be great for people who are new to Spring Boot, just learned Java, or learned it a long time ago. Also, Dingcodingco explains really well so it's easy to understand.

5.0

아트로픽

17% enrolled

This is a lecture that helps you clearly understand why you should use Spring! These days, it's essential to know exactly why certain technologies are used, and I feel like I'm learning that thanks to this course.

What you will gain after the course

The ability to answer with "experience" in backend interviews
Spring Boot + JPA Practical Development Skills
A learning experience that embodies the "Why"
The ability to read production code
The technology stack required by 95% of entry-level backend developer job postings

If you learn Spring this way, you'll fail the interview

I turn on the lecture and follow along.

I slap on @RestController, add @GetMapping... oh, it works? Portfolio complete!

But in interviews, they ask you like this

"What is JPA?"

"Um... with Java, the database... uh... well..."

You'll fail.

"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 made through copy-pasting.

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

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

If you follow along, it works. You can even build a portfolio.

But interviewers ask "why."

"Why do you use JPA?"

"Why do we need transactions?"

"Why do you separate Controller and Service?"

People who only learned "How" answer like this

"JPA is an ORM and... you use save() to save things..."

That's it.There's nothing more to say.

Because they've never experienced it. They've never worked without JPA, so they don't know why JPA is necessary.

That's why this lecture gives you the "pain" first

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

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

After experiencing this pain, when you look at Spring Boot? 7 lines and you're done. The same thing runs.

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

The same goes for JPA. If you connect to a DB without JPA, you have to write SQL strings directly, and the code just to convert query results into Java objects is 50 lines.

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

✨ Features of This Course

📌 Endlessly asks "Why?"

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

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

This course: After directly experiencing the 50-line hell of SQL + RowMapper with JdbcTemplate,

You'll viscerally feel why JPA's single line of save() is revolutionary

Every concept starts with "Why was this technology created?" Once you internalize 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 makes you realize the greatness of the solution.

Session 2: 30 lines of HTTP parsing with ServerSocket Finished in 7 lines with Spring Boot

Lesson 3: JdbcTemplate SQL + RowMapper hell vs JPA save() one line

Period 4: "I didn't write the code, so why does it work?" Confusion → Perfect understanding through proxy pattern

Lesson 5: Controller doing everything and dying from overwork → Clean structure with 3-layer separation

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

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

📌 How to answer in a way that prompts 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 covered in the Backend Resume Differentiation Course)

🗺️ This course is Lv.1

This course is the starting point. I'm building 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) Building APIs with Spring, Interview Preparation

Lv.2 Deployment (AWS, CI/CD) Publishing to the real world, not just localhost

Lv.3 Testing: Become a Developer Who Doesn't Shake When Deploying

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 3 🎁

3 months free access to IntelliJ IDE!

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

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

1. Access the official JetBrains coupon registration page

2.Enter the code and select your desired IDE

3. Check the license issued to your email

⚠ Important Notice:
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 email accounts)

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 it
Someone who ran the code by following a YouTube tutorial, but can't explain it in an interview
Entry-level job seekers intimidated by "Spring Boot, JPA experience preferred" in job postings
People who have read Spring Boot books but can't apply them in real-world situations
Someone who completed a development bootcamp but only knows "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 course review event!)

Hello
This is

13,660

Learners

1,412

Reviews

267

Answers

4.9

Rating

Courses

🚀 Ex-Toss, POSTECH Alumni | Backend 8 years
🎥 YouTuber with 20k subscribers | Development content creator
📚 Inflearn Instructor | 8,000+ cumulative students
👥 Running a developer career community (8,000+ members)
🧩 Contributor to various open source projects (Gradle, Spring AI, etc.)
📝 Passed 38 resume screenings & 100+ resume coaching sessions on Kmong (5.0 rating)

Flipping the way you code, DingcoDingco. Delivering knowledge that is easy and deductively understood.
Đảo ngược lập trình, Dingco Dingco. Truyền tải kiến thức một cách dễ hiểu và có tính suy luận.

Inflearn Interview Link!

Curriculum

All

42 lectures ∙ (9hr 58min)

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

7 lectures ∙ (1hr 2min)

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

5 lectures ∙ (56min)

8. 2-1. 🚀 Launching My First Web Server: Experiencing the Terrible Pain of Pure Java
22:21
9. 2-2. 🌱 Creating a Spring Boot Project: In 3 Seconds, Just Like Instant Ramen
10:36
10. 2-3. 🎯 Creating a Hello World API: Complete a Server in 7 Lines of Code
11:05
11. 2-4. 📤 Creating JSON Responses: The Magic of Java Objects Transforming into JSON
08:05
12. 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)

13. 3-1. 💾 Storing Data in Memory: The Fatal Limitation of HashMap
12:14
14. 3-2. 🗄️ Database Concepts: Installing a Permanent Storage Refrigerator
14:44
15. 3-3. 😭 Saving to DB with JdbcTemplate: Experiencing SQL String Hell
22:53
16. 3-4. ✨ Saving to DB with JPA: Finish in One Line with save() Without SQL
15:44
17. 3-5. 🎮 Creating a Repository: A Control Panel That Works Without Writing Code
16:47

Section 4. [Session 4] Anatomy of Spring's Magic - From Proxy to DI

9 lectures ∙ (2hr 26min)

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

6 lectures ∙ (1hr 25min)

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

10 lectures ∙ (2hr 45min)

Published:

Last updated:

Reviews

All

32 reviews

5.0

32 reviews

lich11158962
Reviews 2
∙
Average Rating 5.0
5
33% enrolled
I ended up taking this course almost by force (?) because my company suddenly started using Spring, but looking back, I don't know what I would have done if I hadn't taken it. I wasn't a complete beginner to backend development, as I had experience with NestJS, so I was worried that Spring might feel too heavy or frustrating. However, those worries were completely shattered from the very first lecture. The flow—from Spring's philosophy to its architecture and why it was designed this way—was so smooth that I lost count of how many "Aha!" moments I had. It doesn't just list syntax; it builds the practical intuition and fundamentals needed in the field. Even coming from a NestJS background, it was great to understand Spring by comparing the two. I can confidently say that for those new to Spring, as well as those like me who have experience with other frameworks but have never properly learned Spring, this single course will completely wash away any vague fears you have. It's hard to find a better course than this for solidifying your fundamentals.
kmk8422
Reviews 2
∙
Average Rating 5.0
5
39% enrolled
This would be great for people who are new to Spring Boot, just learned Java, or learned it a long time ago. Also, Dingcodingco explains really well so it's easy to understand.
98shcho0862
Reviews 2
∙
Average Rating 5.0
5
31% enrolled
atrop
Reviews 1
∙
Average Rating 5.0
5
17% enrolled
This is a lecture that helps you clearly understand why you should use Spring! These days, it's essential to know exactly why certain technologies are used, and I feel like I'm learning that thanks to this course.
kym26750428
Reviews 1
∙
Average Rating 5.0
5
7% enrolled
It was great to have the opportunity to review things I already knew. I think this would be beneficial for experienced professionals who want to organize their knowledge while working in the field.

Limited time deal ends in 7 days

$61,600.00

30%

$68.20

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[Lv1] Spring Boot You Can 'Explain' in Interviews - Backend Development Answering with Experience

Reviews from Early Learners

5.0

What you will gain after the course

If you learn Spring this way, you'll fail the interview

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

That's why this lecture gives you the "pain" first

✅ Here's what you'll learn.

🍽️ Backend Concepts Understood Through Restaurant Analogies

🌱 A course truly designed for beginners

✨ Features of This Course

📌 Endlessly asks "Why?"

📌 "Pain → Salvation" Learning Method

📌 How to answer in a way that prompts follow-up questions from the interviewer

We recommend this for

🗺️ This course is Lv.1

🎁 EVENT 🎁

We'll give this problem set to the first 100 people who write a course review!

🎁 EVENT 2 🎁

🎁 EVENT 3 🎁

Who created this course

Things to Note Before Enrolling

Practice Environment

Learning Materials

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[Lv1] Spring Boot You Can 'Explain' in Interviews - Backend Development Answering with Experience

Reviews from Early Learners

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If you learn Spring this way, you'll fail the interview

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🗺️ This course is Lv.1

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