In a world where every resume looks the same, "differentiation" is what gets you hired. Over the course of 6 weeks, learn 4 practical resume strategies delivered directly by an active backend professional.
696 learners
Level Basic
Course period Unlimited
Reviews from Early Learners
5.0
신영인
Thank you so much for this excellent course! This is a course I simply had to leave a review for! As you go through the lectures, you can really feel how much care went into everything from the structure to the analogies and examples. I'm a self-taught developer currently running a service on my own. I had no idea what I was lacking or what I needed to learn more about, when I came across DingCodingCo's videos on YouTube and started considering taking the course. I hesitated a lot before purchasing. Since I was already working in the field, I was worried it might all be things I already knew. But as I listened to the lectures, I actually came to think it was really the right decision. It felt like DingCodingCo was putting names to the issues I'd encountered in my work and the processes I'd gone through solving them on my own. The parts I knew and didn't know became clearly defined, and as a result, I came to understand well what I need to pay more attention to and study. I also got many ideas about what to improve in my service! I think this is a course worth taking even if you're not a job seeker, as long as you're running a service! Thank you so much for this great course!
5.0
고양이
As a backend developer, I had been feeling that when updating my resume, it's important to show specific competencies connected to practical experience rather than simply listing technologies. This course was a great help in supplementing those areas. Thanks to the real-world cases and project-based explanations covered in the course, instead of simply writing "Java backend capable" on my resume, I was able to more clearly include how I actually utilized it in real situations and what problems I can solve. In particular, I was able to gain specific examples and thought processes that can be used during interviews, so I think this is a course that provided a clear direction for the overall job preparation process.
5.0
심야공방
Simple. Without even an introduction like "Here's what you can learn," it dives straight into the practical aspects of what to write on a resume to make interviewers nod in approval. I work as a backend developer for member/authentication services. Since I mostly deal with hardware and infrastructure directly in on-premise environments, I used to skip courses with 'cloud-based practicals,' thinking, "This is different from my environment." This course also has a part dealing with AWS EC2 and RDS using Terraform, but oddly, I didn't feel any resistance. This is thanks to the way Terraform was introduced simply, almost like a bash script, focusing on "why use this" and "how to collect performance improvement metrics through this." The flow of the lecture itself is organized as: 'Why is it needed → How to configure it → What's needed to prove it with numbers' This structure means it's not just a simple infrastructure practical, but it allows you to write something like "derived improvement plans based on performance metrics" in a single line on your resume. I actually operate an authentication system in an on-premise rack environment full of physical servers. It's an environment where there are physical units for Web01, Web02, ARS, Staging, and DB backup equipment. Even in such an environment, the Prometheus, Grafana, CloudWatch metric design, and load testing → improvement cycle explained in this course were directly applicable. Whether it was cloud or on-premise didn't matter in this course. At first, I thought the Week 3 index optimization lecture would be at the level of basic DB fundamentals. But it actually corrects your perspective on reading execution plans and tracing bottlenecks. It clarifies the meaning of Covering Index, not just at the level of "it's fast," but precisely points out its location in the overall tuning strategy and I/O cost reduction. I also had an experience tuning an identity verification history API where I simply tried to shorten the query length. Following the lecture, I was immediately able to catch on, "Ah, this was a case where the range index condition wasn't applied." That kind of intuition can only be gained from a lecture that explains things centered around cases. I am also looking forward to the subsequent lectures on transactions, lock strategies, and code optimization. This course doesn't just deliver practical knowledge. It is the only course that guides you on "how to write that experience on your resume." So, I changed items that I used to just write like "Automated settlement batch process and improved statistical processing system" on my resume, to reflect the quantitative performance expression, problem-solving oriented structure, and flow demonstrating the meaning of structural transformation I learned in the course, as follows: - Due to the Oracle procedure + Excel-based statistical system, monthly average of 14 million rows of self-authentication transaction data required manual processing taking over 2 hours, with constant risk of work conflicts and human error. - Built an E2E automated batch system based on Spring Scheduled + Crontab. - Prevented parallel execution conflicts and made execution cycles flexible with Crontab. - Included automation of report generation based on Apache POI + automatic sending to administrator email. - Processing time reduced from 2 hours → 15 minutes (88% reduction), maintained 0% settlement error rate, and improved speed of decision-making for related departments with automated reports. Since then, I have gained a standard for judging which structures are stable in practice and which designs are advantageous for maintenance. This standard is immediately integrating into my resume and way of thinking. It's not just a skill upgrade, but a change in the ability to articulate my competence. This course is 'a course that enables me to talk about what I did as a backend developer.' Even if it's not cloud, even if it's not the latest technology, It is a must-take course for any developer who wants to change the sentences on their resume.
Essential Backend Problem-Solving Experience
Spring Application Optimization
Experience with index and transaction issue scenarios
Redis Basics and Troubleshooting Experience
From monitoring concepts to actual AWS setup
2025/05/24 Document Screening Passed, Jeong**
2025/07/31 Final acceptance at 3 companies, Mr./Ms. Ohxx
Link to Do Gi-heon's technical blog (https://dockerel.tistory.com)
Lee x-won
I have analyzed hundreds of successful resumes so far.
Those resumes clearly shared common characteristics.
Specifically, they contained detailed experiences of problem-solving and proved the results with numbers.
However, the advice to 'quantify your achievements' feels too abstract to grasp, doesn't it? I felt the same way.
That's why I organized it in detail and turned it into a course.
It took a total of 178 days to develop, with 946 pages of materials, 32 hours of raw footage, and 12,665 lines of code.
I structured the content systematically to save your time and ensure the most efficient learning experience possible.
After two rounds of meticulous review, I transformed these results into a lecture video with full subtitles.
You can take all of this away in just 20 hours.
This course is not just about simple theory. It is structured to help you apply it to your projects and create a truly competitive resume, following the process of Problem Discovery → Problem-Solving Experience → Quantification for Resume.
I will transform your resume from a simple introduction into a competitive weapon.
The first student of this lecture was a developer from a non-major bootcamp.
Therefore, every concept explained starts from ""Why are we learning this?"".
Docker, AWS, Redis
Isolation Level, MVCC, Query Plan, Deadlock, Phantom Read, Gap Lock
Transaction Propagation, Thread Pool, Cache Avalanche …
We explain these concepts using analogies, practical code, and test codes so that even “those hearing them for the first time” can understand.
Beyond simple definitions of terms, we explain why these technologies emerged to solve specific problems.
Go to Developer Job Search RPG
"Quantify your resume!" You've likely heard this many times, but
in most cases, people don't know how to actually write it.
That is why in this lecture,
A. Problem Situation → B. Solution → C. Improvement Metrics
I have designed this so that you can repeatedly learn this flow in a template format.
In this course, you can learn a persuasive sentence structure based on numerical data..
Real-life resume problem-solving cases explained in the lecture
Lectures that just throw concepts at you and end there,
lectures where you can't even tell how they connect to real-world practice...
I hated those kinds of lectures the most.
This course connects concepts → problem situations → practical application.
It’s not just a simple explanation;
it helps you understand it deeply enough “to be able to explain it to anyone, in any way.”.
In fact, even major companies (one of Naver, Kakao, Line, Coupang, Baemin, Danggeun, or Toss)
technical interview questions could be covered up to 80% with just this one course.
Actual companies look for real-world problem-solving cases, and this is the proof. luôn chú trọng vào các trường hợp giải quyết vấn đề.
Each week, a mission to directly apply what you've learned to your own project will be assigned.
This course does not stop at simply learning theoretical concepts, but is a
process designed to develop practical skills by actually applying them to your own projects..
Additionally, regarding the missions you submit,
I will personally review the results and provide specific feedback.
This curriculum has been thoroughly prepared so that you can incorporate the concepts you've learned into actual projects and develop your practical skills.
You will have an experience where you don't just listen to a lecture,
but directly apply what you learn, receive feedback, and grow..
->
The mission and feedback functions have been changed to be provided in the Challenge Lecture (Updated as of 2025.8.26 )
Please note that we plan to provide instructions on how to enroll in the Challenge Lecture for those who have already registered for the course.
I've written a backend resume, but I don't know where I'm getting rejected.
✔ Those who have listed their skills but don't feel competitive
✔ Those who don't know the difference between a passing resume and their own
I have a portfolio, but I don't know how to structure the sentences.
✔ Those who only write a list of functions like "Implemented Login API"
✔ Those who want to incorporate actual problem-solving experiences into their resume
I want to prepare for interviews while simultaneously improving my resume.
✔ Those who want to prepare for technical interviews based on their resume content
✔ Those who want to apply Transactions, Indexes, and Redis
to their own projects
There are special benefits provided only to those who take the course.
We have collected technical interview questions that were actually asked at major companies.
You can think of this as a special problem set prepared for those who have passed the resume screening to prepare for their technical interviews.
This problem set will be continuously updated, so you'll be able to prepare for interviews in line with the latest trends!!
(This workbook is provided as a Notion link!)
Get it from the community after verifying your course review!
(I have included the verification method in the very last lecture __)
That's not all
We are even providing a developer job preparation guide (resumes, portfolios, etc.)!
After completing the course, the first 10 people who pass the document screening, please share your course review + document screening success story in the Open Chat Room!
As a token of our gratitude, we are giving away Starbucks gifticons.
If you submit the Google Form through this link, này,
🎟 We will send you a discount coupon 🎟
Each of your sincere reviews provides great motivation and help to other students.
If you write a lecture review on your blog and submit it via this link, we will give you a Coupang Eats 30,000 won gifticon!
(However, the course completion rate must be 80% or higher)
Get a 3-month free trial of IntelliJ IDE!
To support your development studies, we have prepared special benefits through a collaboration with JetBrains.
You can use IntelliJ for free for 3 months using the promotion code below!
✅ Promotion Code: HYUNJOONPARKxJB
✅ Benefit Details: JetBrains single IDE (e.g., IntelliJ, PyCharm, WebStorm, etc.) 3-month free trial
✅ Expiration Date: Until May 13, 2026
✅ How to Use😀😀
1. Access the official JetBrains coupon registration page
2. Enter the code and select the desired IDE
3. Check the license issued via email
⚠ Precautions:
This code can only be used by new users who are using JetBrains for the first time.
(Only those with no prior history of using a paid JetBrains license can register)
(You can do this indefinitely by creating a new Google email account)
Added a guide for cases where the Docker Image is corrupted feat. Anfield
Added "Why is our DB in a public subnet?" section feat. Hi
Added JMH plugin installation instructions feat. kongminoo
Added explanation of index data flow feat. Mogging
Added explanation of the criteria for determining the driving table and driven table in the execution plan feat. cho766
2-7 Added Q&A content regarding Spring configuration feat. Chunsiki
6-12. Changes to Redis SETNX content feat.happyrichman
Who is this course right for?
Bootcamp graduate
Experienced in Spring backend
Need to know before starting?
Backend
Spring
16,171
Learners
1,628
Reviews
306
Answers
4.9
Rating
19
Courses
🚀 Ex-Toss, POSTECH graduate | Current Backend Developer (+8 years)
🎥 YouTuber with 20,000 subscribers | Development content creator
📚 Inflearn Instructor | Cumulative 15,000+ students
👥 Running a developer career community (8,000+ members)
🧩 Contributor to various open source projects (Gradle, Spring AI, etc.)
📝 Passed 38 resume screenings and conducted 100+ resume reviews on Kmong (5.0 rating)
I deliver vivid, real-world industry insights in an easy-to-understand and deductive manner.
All
80 lectures ∙ (22hr 28min)
All
194 reviews
5.0
194 reviews
Reviews 25
∙
Average Rating 4.9
Edited
Reviews 1
∙
Average Rating 5.0
5
I got to know you, Dingcodingko, from Threads, moved to YouTube, and was so drawn to your incredible teaching skills that I ended up purchasing your course on Inflearn. I am a junior developer who is preparing for employment. The job market is very difficult these days, and consequently, the requirements for new graduates are increasingly high, leading to a lot of concerns as I prepare my resume and portfolio (projects). I am confident that this lecture will be able to address those concerns. Thank you for creating such good content and lectures, and I will always support you!!!
Reviews 1
∙
Average Rating 5.0
5
Thank you so much for such an excellent lecture!! I especially learned analysis methods for DB performance improvement that I had never thought of before! If I hadn't taken this lecture, I think I would have remained trapped in the misconception that performance improvement could only be solved at the application code level... Based on what I've learned, I'll create a satisfying resume and definitely get it confirmed! Thank you
Reviews 2
∙
Average Rating 5.0
5
Simple. Without even an introduction like "Here's what you can learn," it dives straight into the practical aspects of what to write on a resume to make interviewers nod in approval. I work as a backend developer for member/authentication services. Since I mostly deal with hardware and infrastructure directly in on-premise environments, I used to skip courses with 'cloud-based practicals,' thinking, "This is different from my environment." This course also has a part dealing with AWS EC2 and RDS using Terraform, but oddly, I didn't feel any resistance. This is thanks to the way Terraform was introduced simply, almost like a bash script, focusing on "why use this" and "how to collect performance improvement metrics through this." The flow of the lecture itself is organized as: 'Why is it needed → How to configure it → What's needed to prove it with numbers' This structure means it's not just a simple infrastructure practical, but it allows you to write something like "derived improvement plans based on performance metrics" in a single line on your resume. I actually operate an authentication system in an on-premise rack environment full of physical servers. It's an environment where there are physical units for Web01, Web02, ARS, Staging, and DB backup equipment. Even in such an environment, the Prometheus, Grafana, CloudWatch metric design, and load testing → improvement cycle explained in this course were directly applicable. Whether it was cloud or on-premise didn't matter in this course. At first, I thought the Week 3 index optimization lecture would be at the level of basic DB fundamentals. But it actually corrects your perspective on reading execution plans and tracing bottlenecks. It clarifies the meaning of Covering Index, not just at the level of "it's fast," but precisely points out its location in the overall tuning strategy and I/O cost reduction. I also had an experience tuning an identity verification history API where I simply tried to shorten the query length. Following the lecture, I was immediately able to catch on, "Ah, this was a case where the range index condition wasn't applied." That kind of intuition can only be gained from a lecture that explains things centered around cases. I am also looking forward to the subsequent lectures on transactions, lock strategies, and code optimization. This course doesn't just deliver practical knowledge. It is the only course that guides you on "how to write that experience on your resume." So, I changed items that I used to just write like "Automated settlement batch process and improved statistical processing system" on my resume, to reflect the quantitative performance expression, problem-solving oriented structure, and flow demonstrating the meaning of structural transformation I learned in the course, as follows: - Due to the Oracle procedure + Excel-based statistical system, monthly average of 14 million rows of self-authentication transaction data required manual processing taking over 2 hours, with constant risk of work conflicts and human error. - Built an E2E automated batch system based on Spring Scheduled + Crontab. - Prevented parallel execution conflicts and made execution cycles flexible with Crontab. - Included automation of report generation based on Apache POI + automatic sending to administrator email. - Processing time reduced from 2 hours → 15 minutes (88% reduction), maintained 0% settlement error rate, and improved speed of decision-making for related departments with automated reports. Since then, I have gained a standard for judging which structures are stable in practice and which designs are advantageous for maintenance. This standard is immediately integrating into my resume and way of thinking. It's not just a skill upgrade, but a change in the ability to articulate my competence. This course is 'a course that enables me to talk about what I did as a backend developer.' Even if it's not cloud, even if it's not the latest technology, It is a must-take course for any developer who wants to change the sentences on their resume.
Reviews 3
∙
Average Rating 5.0
5
As mentioned in the intro, it's not just about injecting knowledge, but explaining well from the perspective of "why" - why it's needed, and what content makes a backend developer's resume attractive. Actually, if it were just explaining up to this point, I wouldn't think there's a need to take the course, but since we even get to practice firsthand how to create content for a resume (how to quantify it), I think I can apply it when refactoring previous projects or developing new projects in the future. Thank you for creating this course, especially with the difficult job market situation!
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