38 Companies Pass Secret, 2025 Coding Test Essential Algorithms

🎯 38 Real-World Passes Coding Test Master Class

I have passed all the coding tests for the companies below.

Naver, Kakao, Line, Coupang, Baemin, Daangn, Zigbang, Yanolja, Kakao Bank, MyRealTrip, Hyperconnect,

Kakao Mobility, NAVER WEBTOON, Works Mobile, Banksalad, OHOUSE ...

You think this is an old story? I got a job by taking coding tests until 2024. I changed jobs through coding tests. I've experienced the coding tests of companies that are currently hiring. So I know what and how much you need to prepare.

Meaningless coding test studying? You don't need that anymore. I'll teach you only what you need to know to get hired. Learn compactly and pass all your coding tests.

Real reviews from those who took the course and passed

2025/02/16 TravelWallet Accepted **Hyun-nim

2025/07/31 Final acceptance at 3 places, Mr./Ms. O**

✅ You'll learn this content.

Features of this course

📌For Beginners

• This was created for complete beginners who have never learned algorithms before.

• This explains in detail from why we use this code and how we come up with that idea, to how the values actually change when the code is executed.

• Still, since it might be difficult to understand, I've even included a video that visualizes the algorithm's solution method at the end of the video.

📌Just randomly solving problems?Absolutely not

• We don't just provide simple problem-solving, but teach you step by step from the thought process of how to approach and solve problems when you see them.

• Algorithm problems are not designed for math geniuses to solve. Genius-level insights? Eureka moments? Absolutely not.

• Each element that makes up the problem contains hints about what process to use to solve it. I'll show you how to pick up on those hints.

📌 Community Management

• Nevertheless, there may be things you don't understand or questions that arise.

• This can naturally occur due to the nature of online classes.

• So we've created a community where you can ask questions and get answers in real-time.

• Please come in and feel free to ask anything. I hope you'll share algorithm solutions with various developers and work together to solve problems.

📌 Theory 60%, Practice 40%

• Starting with detailed theoretical explanations, this curriculum ultimately leads to solving actual problems from corporate exams.

I recommend this for people like this

🥳🥳🥳 Real Student Reviews 🥳🥳🥳

😨Concern Point 1😨.
I heard that coding test languages are predetermined these days?

I heard that the coding test language is determined based on the stack you support - like JavaScript for frontend and Java for backend!

That's right. There are cases where language is enforced.

I took coding tests at 38 companies and met with exactly 2 of them.

Most places that you all support have almost no language restrictions.

No matter how you express it, interviewers also know that the ability to think through and solve problems is ultimately what matters.

😨Concern Point 2😨.
It's not my main language?

You might be worried because it's not a language you've already learned.

However, I think the easiest understanding with Python is necessary.

Algorithms are already difficult, but when complex syntax is mixed with difficult logic, it becomes much harder to read the code.

When you first start studying, it's best to understand things as easily as possible, and then try expressing them in more complex ways later on.

It's also good to practice the method of first understanding through Python, then expressing it in your own language.

If you understand the logic with Python, you can definitely express it in Java.

😨Ultimately, language is a means of expression, and understanding the problem is the most important thing.

And the easiest language to understand and solve problems with is Python.

[Updated July 20, 2025]

Many students have requested this, so I've added additional code so you can solve problems in Java, Javascript as well!
I haven't added explanations for these languages, but I think it would be great to view them from the perspective of reviewing the same logic in different languages!

🎁 EVENT 🎁

There are special benefits provided exclusively to those who take the course.

Based on actual problems encountered in 38 real coding tests, there are carefully selected special algorithm problems.

You can think of this as a special problem set created for those who want to do additional problem practice beyond theoretical learning.
This problem set will be continuously updated, so you'll be able to prepare for algorithms in line with current trends!!

(This problem set is provided as a link in Notion format!)

We will give this problem book to those who write course reviews!

Thank you.

Get it after verifying your course review in the algorithm community!

(The authentication method is written in the very last lecture __)

This is not all.

Developer Job Preparation Guide (Resume, Portfolio, etc.) included!

🎁 EVENT 2 🎁

After completing the course, those who have passed please share your course reviews + job change success stories in the open chat room!

Then, as a token of gratitude, I am sending you a coffee gift card.

🎁 EVENT 3 🎁

If you submit the Google form through that link

🎟 We'll provide you with a discount coupon 🎟

🎁 EVENT 4 🎁

Each sincere review provides great motivation and help to other students.

After writing a course review on your blog, please submit it through this link and we'll give you a 30,000 won Coupang Eats gift card!

(However, the completion rate must be 80% or higher)

🎁 EVENT 5 🎁

PyCharm IDE 3-month free license provided!

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

✅ Promotion Code: HYUNJOONPARKxJB
✅ Benefit Details: JetBrains Single IDE (e.g., IntelliJ, PyCharm, WebStorm, etc.) 3-month free license
✅ Expiration Date: Until May 13, 2026
✅ How to Use😀

1. Access the official JetBrains coupon registration page

2. Select your desired IDE after entering the code

3. Check the license issued via email

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

😆 Finally, I'll emphasize just 2 things.

1. This course has undergone two thorough reviews, and all videos include subtitles.

"What's so important about that?" you might think, but many lectures are often uploaded without any review process.

This course has been enhanced in quality through two rounds of review processes that carefully examined the subtitles and context.

2. The textbook has a total of 393 pages.

The course is designed so that you can fully understand the content through the materials alone. We have systematically organized and presented the material content to help you save time and learn as efficiently as possible.

2024.11.30 Update

Among the course feedback, there was feedback saying "I wish there were more example problems."

Reflecting this feedback, I have added bonus problems throughout the lecture materials.

🎆 You can think of the problems with the icon as bonus problems that don't have separate explanation videos.

2024.12.15 Update

Added textbook PDF download link

2025.1.13 Update

3-5. Additional explanation on how to further improve the stack - thanks to zz gg

1-5. Added explanation of the criteria for non-repeating characters as the first approach in finding the mode - thanks to 오수빈님

3-9. Added explanation of the condition that among songs with the same play count, songs with lower unique numbers are included first - thanks to sonjs7554

2025.5.18 Update

4-2 Video Animation Error Fix - thanks to 애롱

2025.7.18 Update

3-3 Textbook Selection Sort Output Error Fix - thanks to 유개발

2025.7.20 Update

Java, Javascript problem-solving code added

2025.10.15 Update

Practical Data Structure Library Comparison Table - thanks to BruBru

2025.10.19 Update

Week 4 Homework #1 boundary value logic modification and boundary value test addition - thanks to Finish in a Month

The person who created this course

• 2021 ~ 2022: S Coding Club Algorithm (data-structure) Tutor

• 2022 ~ : Operating coding YouTube channel DingCodingCo (featuring various content related to developer job hunting)

• 2022 ~ 2023 : Viva Republica Server Developer

• Never give up on students 🦈

• Developer Job Hunt Community Management

  
  

  • ✅ Join KakaoTalk Room: https://open.kakao.com/o/gPI6kTUg

    
    

  • ✅ Join Discord: https://discord.gg/X74q5Yw3Sv

    
    

Pre-enrollment Reference Information

If!! you have even the slightest hesitation before enrolling in the course.

Am I taking the right course right now?? If you're wondering about this, feel free to reach out anytime through our open chat room!!

😍 I'll do my best to answer diligently 😍