CS Interview Preparation Guide Directly from Channel Talk Interviewers - Network & Web Edition

🤬 Network & Web interviews—I definitely know the content, so why can't I get the words out?!

I am Jayon, currently working as a backend engineer and interviewer at Channel Talk, after completing the Woowa Tech Course and working as a backend engineer at several companies. I wasn't someone who was good at interviews from the start. In fact, I ranked in the bottom tier during the Woowa Tech Course mock interviews, to the point where I even had to have a private meeting with the CEO.

The working principles of DNS? I knew them. The concept of JWT? Of course, I had that organized. But everything changed once I sat down in the interview room.

"Explain the structure of JWT and why access tokens and refresh tokens are separated." Up to that point, it was fine. I said everything exactly as I had prepared. But the moment the interviewer pinpointed one of my answers and asked, "Then how do you respond if a JWT is stolen, and how do you determine whether it has been stolen?", my mind went blank. I had definitely seen it somewhere. I had even summarized it. But in that moment, sitting right there, I just didn't know what to say.

When I searched on my phone after the interview and realized, "Ah, it was this..." that feeling of emptiness... I'm sure many of you can relate.

From then on, I started recording and reviewing my interviews. I created a "wrong answer note" and compared my previous answers with my current ones for the same questions. As I accumulated hundreds of questions and answers, patterns began to emerge. I started to see which answers convinced the interviewers and which ones invited unnecessary follow-up questions.

It was only after going through this trial and error hundreds of times that I realized: knowing the theory and speaking in an interview are completely different skills. That's why I decided to create a lecture focused solely on "how to answer the questions."

✨ 4 Key Points I focused on while creating this course

👍 This is recommended for the following people!

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✔ Note

1. Network & Web basic theory is assumed to be known before proceeding with the class. The effectiveness of the lecture will be maximized only if you have encountered concepts such as HTTP and REST API at least once.

2. If you come across any parts you don't understand while studying, please feel free to ask questions immediately by using the Q&A board😊

   
   

🚨 Be sure to check who the educator is!

If you meet the wrong doctor, you may face death because your illness cannot be cured at that moment. However, death ends with the pain of that instant. But if you meet the wrong teacher and receive a poor education, you will suffer throughout your entire life.

Due to poor education, you may end up at a company you don't want to work for, receive a lower salary than expected, and suffer for the rest of your life as a result. Not only that, but the poor education you received can be passed down to your children as a cycle of flawed education.

I believe that education can change a person's life very positively, but on the other hand, it can also completely ruin a person's life. That is why I believe education carries such a heavy responsibility.

Therefore, please check who the educator is, what kind of person they are, and what path they have taken, and make a careful judgment.

👋 Hello!
I'm finally introducing myself ( ⸝⸝•ᴗ•⸝⸝ )੭⁾⁾

Hello!

I am Jayon, a 5th-year developer working as a backend engineer at Channel Corp.

I completed the Woowa Tech Course 3rd Backend program and started my career at a small SI company. My salary was at the minimum level. To escape that situation, I spent a tremendous amount of time preparing for coding tests and interviews. As a result, after passing through Chai Corporation (PortOne), I am currently earning several times my initial salary while managing Channel Talk's core system, which handles billions of records.

Through this process, I realized that it is truly difficult to find the right direction when preparing for a job alone. That is why I have been active as a backend mentor at F-Lab, JSCODE, and Fast Campus, and also served as a reviewer for the 5th Woowa Tech Course. Through mentoring, I have helped students successfully land jobs at top-tier tech companies (Naver, Kakao, Line, etc.), unicorns, and major corporations, and the know-how accumulated during that process is fully embedded in this course.

Just as I received a lot of help when I was going through difficult and challenging times, I wanted to become someone who could help many others as well. I felt the most proud and happy when the value I created through development had a positive impact on other people.

I also run a tech blog, steady-coding, so please stop by if you're curious about what kind of developer I am!

Thank you!

🚌 Feeling lost about which order to take the courses in?

'[2026] Essential Curriculum for Getting a Job as a Backend Developer (IT Service Companies)' Please refer to this!