15 years of professional backend development experience
Experience as a development team lead in organizations of various sizes, from Series A startups to NASDAQ-listed companies
If you are one of these people, you can achieve 120% efficiency!
Backend developers with 3–7 years of experience who are currently operating a monolithic service and preparing for domain separation/MAS transition
Backend developers who don't have a senior mentor to review their designs on their team
Developers who need to prove their design skills to prepare for a career move to a large-scale service
Without prior backend knowledge, you may find it difficult to keep up with the challenge.
(JPA, REST API, Java, springboot)
Hello, I’m a backend developer with 15 years of experience Park Jin-woo from Chamnalgae.
I have led development teams at a wide range of small startups, Nasdaq-listed companies, and foreign-owned firms five or six times, and as the team lead for outsourced development projects working with new people each time, I learned a very painful lesson.
Development without design as a prerequisite leads to endless technical debt and communication problems, as well as overtime.
In startups and small-to-medium-sized companies lacking both senior guidance and staff, if you don’t work with design as a prerequisite,
you won’t be able to resolve issues with communication among colleagues, let alone unlock your career growth potential.
Through teaching more than 50 programming tutoring sessions and advanced backend courses on Inflearn, Programmers, and Soomgo, I have been considering how to effectively convey DDD (Domain-driven Design) architecture.
A Spring Framework design course incorporating experience with large-scale traffic.
Introduction to Spring Boot Kafka Producer/Consumer Hands-On Practice
Spring Batch for Immediate Use in Production
Spring Boot DDD in Practice: Learn Domain Design Through an Order System
As a backend developer in a small organization, I know better than anyone the bottlenecks you are likely struggling with most. The thirst for experience that AI cannot satisfy. I will teach you a framework for making decisions.
For four weeks, I will be your mentor and help you with everything from monolith to MSA design, including code reviews and feedback.
Bring all your concerns with you. Then, see you in the challenge!
Detailed Challenge Schedule
For four weeks, you will design each week and receive reviews.
Course Lessons → Individual Assignment → Tuesday Live Feedback
01 WEEK
Build a Real-World Order System (Basic Structure)
Take the course
Individual assignment Designing the MSA service boundaries for the order domain on your own
Week 1 Feedback Live
Tuesday 20:00–22:00 · September 15th
Live 1: Individual Service Boundary Design Review and Feedback
We will review the design rationale based on each person’s proposed service boundaries for the order domain.
• Check responsibilities and data ownership by function • Review whether the service boundaries are too broad or split too finely • Provide feedback on synchronous calls and event flows • Review representative design examples • Discuss directions for improving individual assignments and answer questions
02 WEEK
Improve the structure using hexagonal architecture
Take the course
Individual assignment Refactor monolithic code into a hexagonal architecture
Week 2 Feedback Live Tue 20:00–22:00 · September 22
Live 2: Hexagonal Refactoring Code Review
03 WEEK
Distributed Systems Design: CQRS·Event-Driven·ACL
Course enrollment
Individual assignment Submit the final CQRS·Event-Driven·ACL design document
Week 3 feedback live session Tue 20:00–22:00 · September 29
Live 3: Final distributed systems design review and Q&A
04 WEEK
Kafka, gRPC (internal communication)
Take the Course
Week 4 final live session Tue 20:00–22:00 · October 6
Live 4: Kafka hands-on practice 2 hours of practice
A backend developer who wants to improve a complicated service structure
Developers who understand the DDD concept but are unsure how to apply it in practice
A backend developer contemplating how to divide domain boundaries and responsibilities
A backend developer familiar with basic development who wants to learn more advanced technologies and patterns
Need to know before starting?
Basic syntax of Java or similar object-oriented languages
Basic Understanding of Object-Oriented Design and Unit Testing
Reviews
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FAQs
Yes. If you have a basic understanding of Java, Spring Boot, and object-oriented design, you can participate. Even without DDD experience, we’ll proceed from the concepts through hands-on practice.
Yes. You can complete the mission on your own using the order-domain example used in the challenge. If you have a personal project, you may also adapt it to fit that domain.
Live attendance is recommended, but if you’re unable to participate, you can still complete the videos and missions. Please check the scope of the announced replay availability and feedback provided.
I review with a focus on domain responsibilities and boundaries, dependency direction, and the rationale behind applying CQRS, event flows, and ACLs. Rather than presenting the right answer, I help you explain your design rationale yourself and improve it.
No. The focus is on DDD-based domain design and architecture application. MSA is covered briefly as the context in which DDD is used, and the final deliverable is an individual DDD design document.
Yes. Even those who are new to Kafka can participate. The challenge guides you step by step through the Kafka concepts and usage methods you’ll need, and is designed to help you learn through hands-on practice installing and running it yourself.
취소 및 환불 규정 챌린지는 지식공유자가 설정한 수업 최소 정원이 충족되지 않을 경우, 폐강 안내가 고지되며 결제 내역이 자동취소됩니다.
