38 Companies Pass Secret, 2025 Coding Test Essential Algorithms

🎯 Coding Test Master Class Completed with 38 Passes

I passed all the coding tests of the companies below.

Naver, Kakao, Line, Coupang, Baemin, Carrot, Zigbang, Yanolja, Kakao Bank, My Real Trip, Hyperconnect,

Kakao Mobility, Naver Webtoon, Works Mobile, Bank Salad, Today's House...

Isn't that old news? I took a coding test and changed jobs by 2024. At this point, I've experienced the coding tests of companies currently hiring. So I know what to prepare and how much to prepare.

Meaningless coding test studying? No more. I'll teach you just what you need to know to get a job . Just learn it compactly and pass all the coding tests.

✅ Learn these things:

Features of this course

📌 No-base target

• It was created for beginners who have never learned an algorithm before.

• It explains in detail why this code is used, how the idea came about, and how the value changes when the code is actually executed.

• But just in case you still don't understand, I've included a visual representation of the algorithm's solution at the end of the video.

📌 Just solving problems? Absolutely not.

• Rather than simply solving a problem, we will teach you step-by-step how to approach and solve the problem.

• Algorithm problems aren't meant to be solved by math geniuses. A brilliant idea? A Eureka moment? Absolutely not.

• Each element of the problem provides hints on how to solve it. I'll show you how to find those hints.

📌 Community Operation

• Nonetheless, you may have some questions or concerns that you don't understand.

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

• So we created a community where you can ask and answer questions in real time.

• Please feel free to come in and ask any questions you have. We also encourage you to share your algorithm solutions with other developers and try to solve them.

📌 60% theory, 40% practice

• This curriculum begins with detailed theoretical explanations and ends with solving actual problems presented by companies.

I recommend this to these people

🥳 🥳 🥳 Real student reviews 🥳 🥳 🥳

😨 Point of concern 1 😨 .
I heard that the language for the coding test is set these days?

Depending on the stack you're supporting, the language you're looking at for the coding test is set, like JavaScript for the front-end and Java for the back-end!

That's right, there are cases where language is forced .

I've seen the codes in 38 places and only met them in 2 places.

Almost all of the places you apply to have almost no language restrictions.

No matter how you express it, interviewers know that ultimately, problem-solving thinking skills are important.

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

You may be worried because it is not a language you have already learned.

However, I think it is easiest to understand with Python.

Algorithms are already difficult, but when you mix complex grammar with difficult logic, the code becomes even more difficult to read.

When you first start studying, it's best to try to understand it as simply as possible, and then try to express it in a more difficult way later on.

After understanding it through Python, it would be a good idea to learn how to express it in your own language.

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

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

And the easiest language to understand and solve is Python.

[Updated July 20, 2025]

We've added additional code so that many students can solve the code in Java and Javascript, which they've been hoping for!
I haven't added any commentary in the language, but I think it would be good to look at it from the perspective of reviewing the code with the same logic in another language!

🎁 EVENT 🎁

There are special benefits available only to those who take the course.

There are special algorithm problems carefully selected based on actual problems encountered while looking at 38 real-life coding tests.

You can think of this as a special workbook created for those who want to study problems in addition to studying the theory.
This workbook will be continuously updated, so you can prepare for algorithms according to trends!!

(The workbook is provided as a link in Notion format!)

We will give the corresponding workbook to those who write a review of the course!

thank you

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

(How to authenticate is written in the last lecture __)

And that's not all

We even provide a developer job preparation guide (resume, portfolio, etc.)!

🎁 EVENT 2 🎁

After taking the course, those who passed, please share your course review + successful job change story in the open chat room !

Then, as a token of our appreciation, we are giving you a coffee gift certificate.

🎁 EVENT 3 🎁

Please submit the Google survey through this link.

🎟 We will send you a discount coupon 🎟

🎁 EVENT 4 🎁

Each and every honest review is a great source of motivation and help to other students.

If you write a lecture review on your blog and submit it to the link below, you will receive a 30,000 won Coupang Eats gift certificate!

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

🎁 EVENT 5 🎁

Get 3 months of free Pycharm IDE!

To support your development studies, we have prepared special benefits in collaboration with JetBrains .
Get 3 months of Pycharm free with the promo code below!

✅ Promo Code : HYUNJOONPARKxJB
✅ Benefits : 3 months free access to JetBrains single IDEs (e.g. IntelliJ, PyCharm, WebStorm, etc.)
✅ Expiration date : Until May 13, 2026
✅ How to use 😀

1. Access the JetBrains official coupon registration page .

2. Enter the code and select the desired IDE.

3. Confirm the license issued by email

⚠ Note :
This code is only available to new JetBrains users .
(Only those who have not previously used a JetBrains paid license can register)
(You can do this infinitely by re-creating Google email)

😆 Lastly, I would like to emphasize two things.

1. This course has been meticulously reviewed twice, and all videos include subtitles.

You might be thinking , "What's the big deal?" , but many lectures are uploaded without any review.

This lecture has been thoroughly reviewed twice to ensure completeness, with subtitles and context meticulously checked.

2. The textbook has a total of 393 pages.

The textbook itself is designed to ensure a thorough understanding of the material. We've systematically organized and presented the material to save you time and ensure maximum learning efficiency .

Updated November 30, 2024

Among the lecture feedback, there was one that said, "I wish there were more example problems."

To reflect this, bonus problems have been added throughout the lecture material.

🎆 You can think of the problems with the icon as bonus problems that do not have separate explanation videos.

Updated on December 15, 2024

Add a link to download the textbook PDF

Updated on January 13, 2025

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

1-5. Added a description of the criteria for the first non-repeated character in finding the most frequent value - thanks to Oh Su-bin

3-9. Added condition description that among songs with the same number of plays, songs with lower unique numbers are included first - thanks to sonjs7554

Updated on May 18, 2025

4-2 Fixed animation error in video - thanks to Aerong

Updated on July 18, 2025

3-3 Corrected error in selection sort output in textbook - thanks to Yoo Ga-bal

Updated on July 20, 2025

Added Java and Javascript problem-solving code

Who created this course

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

• 2022 ~ : Operate the coding YouTube channel Dingcodingco (Have various contents related to developer employment)

• 2022 ~ 2023: Viva Republica Server Developer

• Never give up on a student 🦈

• Operating a developer employment community

  
  

  • ✅ Enter KakaoTalk room: https://open.kakao.com/o/gPI6kTU g

    
    

  • ✅ Join Discord: https://discord.gg/X74q5Yw3S v

    
    

Things to note before taking the class

If!! You have any concerns before applying for the course.

Is it right for me to take this course now?? If you have any concerns, please feel free to ask in the open chat room at any time!!

😍 I will try my best to answer 😍