CS Interview Preparation - Database Edition: Insights Directly from Channel Talk Interviewers

🤬 Database interviews—I clearly know all the content, so why won't the words come out of my mouth?!

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

Transaction isolation levels? I knew them. Index operating principles? Of course, I had them organized. But everything changed once I sat down in the interview room.

"Please explain the types of transaction isolation levels." Up to this point, it was fine. I recited everything just as I had prepared. But the moment the interviewer picked out one of my answers and asked, "Then how is Phantom Read resolved in REPEATABLE READ?" my mind went completely 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 Points I focused on while creating the lecture

👍 This is perfect for people who:

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✔ Notes

1. Database basic theory is assumed to be known for this class. The effectiveness of the lecture will be maximized only if you have encountered concepts such as transactions and indexes at least once.

2. If there are 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 die because your illness cannot be cured at that moment. However, death ends with the pain of that moment. 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 never wanted to join, 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 as a cycle to your own children.

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 Talk.

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 and managing Channel Talk's core systems, which handle billions of records.

I realized through this process 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, Coupang, Baemin, Danggeun, Toss), unicorns, and major corporations, and the know-how accumulated during that process is fully captured in this lecture.

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

I also run a technical blog, steady-coding, so if you're curious about what kind of developer I am, please feel free to visit!

Thank you!

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➡ CS Interview Preparation directly from a Channel Talk interviewer

(https://inf.run/8VEbS)