In a world where all resumes look the same, 'differentiation' makes the difference in getting hired. Over 6 weeks, learn 4 practical resume strategies directly from a backend professional.
618 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.
Backend Essential Problem-Solving Experience
Spring Application Optimization
Experience with index and transaction issues
Redis Fundamentals and Problem-Solving Experience
From Monitoring Concepts to Actual AWS Setup
2025/05/24 Document screening passed ***
2025/07/31 Final acceptance at 3 companies Oh**
Dogiheon's tech blog link (https://dockerel.tistory.com)
Lee x-won
I have analyzed hundreds of successful resumes so far.
Those resumes clearly had common characteristics.
Specifically, they contained concrete experiences of solving problems, and proved the results with numbers.
But the advice to 'quantify' feels abstract and hard to grasp, doesn't it? I felt the same way.
So I organized it concretely and created it into a course.
I developed it for a total of 178 days, the textbook is 946 pages, the original footage is 32 hours, and the code is 12,665 lines.
I systematically structured the content to save your time and enable the most efficient learning possible.
I turned these results into fully subtitled lecture videos through two rounds of thorough review.
You can get all of this in just 20 hours.
This course is not just theory. From problem discovery → solution experience → documenting through metrics, it's structured to help you apply it to your projects and create a truly competitive resume.
I will transform your resume from a simple introduction into a competitive weapon.
The first student of this course was a non-CS major bootcamp graduate developer.
Therefore, every concept explained starts with "why we need to learn this".
Docker, AWS, Redis
Isolation Level, MVCC, query plan, deadlock, phantom read, Gap Lock
Transaction propagation, Thread Pool, Cache Avalanche …
These concepts are explained "so that even those hearing them for the first time can understand"
through analogies, practical code, and test code.
Rather than simple term definitions, it explains why these technologies emerged to solve problems.
You've heard the phrase "Quantify it on your resume!"
many times, but most people don't actually know how to use it.
That's why in this course,
A. Problem situation → B. Solution → C. Improvement metrics
I've created this so you can practice repeatedly in a template format.
You can learn a persuasive sentence structure based on numbers in this course. trong khóa học này.
Real resume problem-solving examples 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 actual work...
I hated those kinds of lectures the most.
This course connects concepts → problem situations → practical application.
It's not just simple explanations,
but helps you understand "to the point where you can explain this to someone else"..
In fact, 80% of the questions that came up in a
technical interview lecture from an actual major company (one of NAVER, Kakao, LINE, Coupang, Baemin, Danggeun, Toss) could be covered with just this one course.
This is proof that real companies look at problem-solving cases. cho việc bạn sẽ thấy các tình huống giải quyết vấn đề từ các công ty thực tế.
Each week, there will be a mission to apply directly to your own project.
This course is not just about learning theoretical concepts,
but a course designed to develop practical skills by actually applying them to your own projects..
Additionally, for the missions you submit,
I will personally review the results and provide you with specific feedback.
This is a curriculum thoroughly prepared so that you can apply the concepts you've learned to actual projects and develop practical skills.
Don't just settle for a lecture you simply listen to,
take away the experience of applying directly, receiving feedback, and growing..
The mission and feedback features have been changed to be provided in the challenge course (updated as of August 26, 2025). For those who enrolled previously, the challenge course
The mission and feedback features have been changed to be provided in the challenge course (updated as of August 26, 2025).
For those who have already enrolled, we will provide information on how to transfer to the challenge course, so please take note.
I've written a backend resume, but I don't know where I'm getting rejected.
✔ Those who listed their skills but don't feel competitive
✔ Those who don't know the difference between a resume that gets accepted and their own resume
I have a portfolio, but I don't know how to structure my sentences.
✔ Those who only write feature-listing sentences like "Implemented login API"
✔ Those who want to incorporate actual problem-solving experience into their resume
I want to prepare for interviews while improving my resume at the same time.
✔ Those who want to prepare for technical interviews based on their resume content
✔ Those who want to apply transactions, indexes, Redis to
their own projects
There are special benefits provided exclusively to those who take the course.
I've compiled 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 technical interviews.
This problem set will be continuously updated, so you'll be able to prepare for interviews in line with current trends!!
(This problem set will be provided as a Notion link!)
Please authenticate your course review in the community and claim it!
(The verification method is written in the very last lecture __)
That's not all
I'll also provide you with a developer job preparation guide (resume, portfolio, etc.)!
After completing the course, the first 10 people who pass the document screening should share their course reviews + document screening success stories in the open chat room!
As a token of appreciation, we are giving out Starbucks gift cards
If you submit the Google form through this link
🎟 We will provide you with a discount coupon 🎟
Each sincere review provides great motivation and help to other students.
Write a course review on your blog and submit it via this link, and we'll give you a 30,000 won Coupang Eats gift card!
(However, the course completion rate must be 80% or higher)
3 months free access to IntelliJ IDE!
To support your development studies, we've prepared special benefits through collaboration with JetBrains.
You can use IntelliJ for free for 3 months with the promotion code below!
✅ Promotion Code: HYUNJOONPARKxJB
✅ Benefits: 3-month free subscription for a single JetBrains IDE (e.g., IntelliJ, PyCharm, WebStorm, etc.)
✅ Valid Until: May 13, 2026
✅ How to Use😀😀
1. Access the official JetBrains coupon registration page
2.Enter the code and select your desired IDE
3. Check the license issued to your email
⚠ Important Notice:
This code is only available for new users who are using JetBrains for the first time.
(Only those who have never used a paid JetBrains license before can register)
(You can do this infinitely by creating new Google emails)
Added guide for Docker Image corruption cases feat. Anfield
Why is our db in a public subnet? Section added feat. Hi
Added JMH plugin installation instructions feat. kongminoo
Added explanation of index data flow feat. mogging
Added explanation of criteria for determining driving table and driven table in execution plan feat. cho766
2-7 Added Q&A content related to Spring environment configuration feat. 춘시키
6-12. Redis SETNX related content changes feat.happyrichman
Who is this course right for?
Bootcamp graduate
Spring backend experienced developer
Need to know before starting?
Backend
Spring
13,660
Learners
1,412
Reviews
267
Answers
4.9
Rating
16
Courses
🚀 Ex-Toss, POSTECH Alumni | Backend 8 years
🎥 YouTuber with 20k subscribers | Development content creator
📚 Inflearn Instructor | 8,000+ cumulative students
👥 Running a developer career community (8,000+ members)
🧩 Contributor to various open source projects (Gradle, Spring AI, etc.)
📝 Passed 38 resume screenings & 100+ resume coaching sessions on Kmong (5.0 rating)
Flipping the way you code, DingcoDingco. Delivering knowledge that is easy and deductively understood.
Đảo ngược lập trình, Dingco Dingco. Truyền tải kiến thức một cách dễ hiểu và có tính suy luận.
All
80 lectures ∙ (22hr 28min)
All
178 reviews
5.0
178 reviews
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 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 25
∙
Average Rating 4.9
Edited
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!
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
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