A Portfolio Guide from a CTO Who Has Reviewed 10,000 Applicants

This is a practical resume writing strategy lecture shared directly by a Technical Director who has reviewed over 10,000 resumes. There is no such thing as a "guaranteed pass template" or a "must-pass formula" in this world. I will show you the perspective of a document reviewer—how they read resumes, what they focus on, and what makes them feel fatigued. A resume is not a subject for memorization. The core of this lecture is understanding the process itself of properly organizing and expressing who you are. Whether you are an experienced professional or a newcomer, this lecture will be helpful for any developer who has ever struggled with their resume.

This is a practical technical interview strategy lecture shared directly by a Technical Director who has conducted over N,000 technical interviews. There is no such thing as a "guaranteed way to pass" or a "guaranteed formula for success" in this world. I will show you the interviewer's perspective—how they perceive a resume during the preparation stage, and what they focus on and prioritize during the interview process. A technical interview is not a memorization subject with fixed answers. The core of this lecture is understanding the essence of the process itself: showing your true self to the interviewer and persuading them. Whether you are an experienced professional or a newcomer, this lecture will be helpful for any developer who has ever worried about technical interviews.

"In the AI era, so what should developers do?" To this question, former Toss Payments Technical Director Jaemin Kim and Inflab CTO Hyangro provide the answers. Beyond flashy technology, discover the most realistic answers on 'how to grow solidly in a given environment'!

Messy code, a flood of requirements... If you're looking for a breakthrough with AI, Learn how to become a "high-performing developer" by leveraging AI in legacy environments, taught by the former VP of Engineering at Toss Payments. Legacy code isn't going anywhere, even in the age of AI. It’s no exaggeration to say that every company has legacy code, unless they were founded today. So, how should we utilize AI in this reality? In this course, the former VP of Engineering at Toss Payments, who led a large-scale payment service organization, demonstrates firsthand how to work effectively using AI in legacy environments. This isn't just a course about how to use AI or basic coding skills. The goal is to help you develop your "critical thinking" as a developer and truly understand what it means to work effectively.

This course focuses on building the real skills needed in actual development work. The goal is not simply to learn how to write code well, but to experience how to work well as a developer. The examples are based on the commerce domain, covering cases frequently encountered in real-world work environments, and are provided in SpringBoot & Kotlin. However, it's a course where anyone can contemplate and experience real-world development through thought-provoking content, without being dependent on any specific language or framework. Based on the practical perspective of a senior developer and former director at Toss Payments who led a large-scale payment service organization, the course is designed to help you learn the thought processes and design decisions used in actual work environments.

Because you never know when or how software will grow, you always need to be prepared to continue growing. This provides one direction for that.

This is a practical resume writing strategy lecture shared directly by a Technical Director who has reviewed over 10,000 resumes. There is no such thing as a "guaranteed pass template" or a "must-pass formula" in this world. I will show you the perspective of a document reviewer—how they read resumes, what they focus on, and what makes them feel fatigued. A resume is not a subject for memorization. The core of this lecture is understanding the process itself of properly organizing and expressing who you are. Whether you are an experienced professional or a newcomer, this lecture will be helpful for any developer who has ever struggled with their resume.

Getting a job right now is by no means the end of the journey. Acknowledging the possibility of future career moves, I have structured this course to ensure that your recurring job-seeking activities as a professional can proceed smoothly in the future. As an active headhunter with 15 years of HR experience across conglomerates, mid-sized companies, SMEs, foreign firms, and startups, and as a published author of career books, I will reveal all the practicalities and conventions of the job market, including the most sensitive details.

[2026 Latest Edition] Discover everything from essential practical skills for junior content marketers with no experience to job-seeking know-how!

Developers, can you really succeed just by developing your development skills? Build your own brand that differentiates you from the crowd of developers along with your development skills, add soft skills, and be active in the development ecosystem.

Many people write. But most of those writings end up buried in files. This lecture starts from that point. ✔ “Why does nothing happen even when I write?” ✔ “How can I connect my writing to opportunities and money?” Through 26 years of corporate experience and actual writing, publishing, and lecturing experience, I have personally built a structure where writing becomes an "asset." In this lecture, I will share more than just simple writing techniques; I will show you specifically how to: 👉 Take a finished piece of writing → Expand it into blog posts/content → Build it into a portfolio → Connect it to lecturing, publishing, and business opportunities In particular, I will explain the entire flow based on realistic standards: How a single piece of writing expands into content How 5 pieces of writing become a lecture How 40 pieces of writing become a book By the end of this lecture, your writing will no longer be just a "record," but an asset that works on your behalf.

Stop paying for student record design. I will reveal all the consulting secrets used directly by an admissions consultant with 30 years of experience.

This course is part of the 'Wrtn AI Literacy Voucher Program', a collaboration between Inflearn and Wrtn, and is available completely free for job seekers who are vulnerable to AI. Career expert Career D will teach you step-by-step how to apply AI to job searching and career transitions. From basics to hands-on practice, it's designed so that even AI beginners can follow along easily without any burden!

Can you make extra money with a blog? That's all a scam. Have you ever made money with a blog? Or Do you know anyone who made money with a blog? If you're just planning to blog for a day or two, don't apply in the first place. Runt will sincerely tell you ways to make money, and will provide feedback on your questions through a separate KakaoTalk room.

A blog of your own that everyone dreams of! Not just another common blog you see everywhere, but a differentiated blog that you create and manage yourself! Try it now with a Github blog!

This is a lecture for those who want to consistently write a technical blog. Starting is easy, but trying to do it consistently leads to many trials and errors. This lecture compiles what I've tried and the know-how gained from operating a technical blog for over 7 years. It contains all my 7 years of experience, including SEO, technical blog writing strategies, writing process, etc.

This course aims to help even those new to Astro complete a live, deployed blog within one hour. We minimize theoretical explanations and focus on copy-and-paste ready code and step-by-step checkpoints. By the end of the course, 👉 You won't just be someone who "has tried Astro," 👉 You will be someone who "has a blog built with Astro."

Middle school students will use the AI-SPARS tool to systematically analyze their interests and strengths, and explore customized careers, majors, and elective courses. The program is practice-oriented, ranging from AI in-depth interviews to career roadmap design, ultimately resulting in the completion of a personalized career portfolio.

UX/UI Design Basic Theory + Practice UX/UI Design Career Employment Strategy

Notion is a growing tool that is still evolving and filling in its gaps. I've summarized the core essentials, from basic usage to key precautions when sharing documents. Just stick with it for one week. Your life before 😵‍💫 and after 😎 the lecture will be completely different!

[Inspiration Note] From ways to find inspiration in daily life with author Seunghee, to everything you're curious about regarding Seunghee as a brand marketer!

For those who have chosen a career in information security/information technology and are preparing to move to large corporations/financial institutions, we will reveal our strategy for passing the exam. A current CISO who has personally recruited and recommended numerous people will share his secrets for passing the exam. He has heard from his acquaintances, security company CEOs and executives of large companies, and compiled a recruitment bible by collecting a vast amount of recruitment secret data.

Do you feel overwhelmed just thinking about the moment of persuasion? Stop relying on emotions and intuition for negotiations! With former Apple business coach Jasmine Han, you can take control of negotiations in just 15 minutes a day for one month.

A course where you can understand core data structure concepts and train to explain them verbally for interviews.

This course was created to solve a common problem many people face while preparing for developer jobs: "I studied CS and data structures, but I get tongue-tied during interviews." While conducting actual interviews at companies like Naver, Kakao, and Toss, I noticed that most candidates have memorized concepts but cannot explain why those concepts are necessary or how they are applied in real-world situations. Rather than simple rote memorization, this course teaches you how to understand the interviewer's intent and provide more persuasive answers to the same questions. Whether it's the OSI 7 layers, data structures, or coding tests, we focus on why you need to know them, when they are used, and how to speak about them to receive a positive evaluation in an interview. This course is for those who want to become developers who can explain what they understand in their own words, rather than just giving the same answers as everyone else.