F-Lab Technical Insights, Plugin

Document writing is the most challenging part for both aspiring and current developers! Create your own portfolio by looking at how successful candidates write their documents! We speak based only on documents that actually passed!

With step-by-step explanations that even beginners can easily understand, the once-vague coding tests will become clear. Learn only what you need and apply it to real-world practice right away!

You've probably written SQL using JdbcTemplate before, right? Everyone has likely had that experience of sighing while having to fix both the SQL and the RowMapper every time a single column changes. This course starts from that very pain. Doing a single SELECT with pure JDBC takes 35 lines. You open a Connection, create a PreparedStatement, iterate through the ResultSet, and if you miss a single close(), the server crashes. After typing through this hell yourself, when you finally encounter a single line of JPA's save(), you'll feel "this is why we use JPA" not just in your head, but in your hands.

The biggest challenges in operating batch systems that process millions of records are performance degradation and the difficulty of recovery in the event of a failure. These issues cannot be solved with simple loops or poor design. Based on my experience of reliably processing large-scale data in real-world service environments, this course covers the structure and operating principles of Spring Batch and provides design methods to achieve both performance and stability. Moving beyond simple functional descriptions, this course will help you develop fundamental data processing problem-solving skills through batch architectures that can be applied immediately in practice.

From comparing 14 different job roles to understanding job functions, analyzing job postings, study roadmaps, and career transition strategies — we have gathered only the essentials needed to get started in data analysis. We will lay out a map to help you find your direction without wasting any time!

From small projects to practicing structure building! A hands-on, mini-project-based introductory course for those who lack experience in Java object-oriented design and practice. From the basics to structural thinking, improve your skills by implementing a Java application from start to finish.

Java is not difficult to learn. It's just that it becomes difficult because you learn too many unnecessary things. There are things in technology that can only be understood when you reach that stage. But, it's just hard because you try to cram too much unnecessary stuff into your head. Technology is experience. Let's learn quickly and simply!!

In many programming languages, including Javascript, asynchronous operations are one of the most difficult and complex elements of software. You can discard primitive asynchronous programming such as setTimeout and setInterval and easily handle complex asynchronous operations through RxJS.

Beyond the first wave of AI, the era of Physical AI, represented by autonomous driving and robotics, is arriving. To prepare for a future where AI permeates transportation, delivery, manufacturing, and service sectors, we will understand the changing job market and establish specific learning strategies and career directions for survival.

"Most similar to real practice! Capture employment, coding competitions, and skills all at once." Perfect preparation for corporate coding tests! Skill improvement from basics to intermediate level! This course contains only the essentials needed for coding test preparation. Structured step-by-step from basic concepts to practical problems, you can simultaneously develop programming skills and practical sense.

"2026 UIUX Designer | Coding Designer Agency Pass Portfolio Reveal" This is a practical lecture on creating a UIUX web portfolio that catches the interviewer's eye. The curriculum is designed not just for simple portfolio creation, but to enhance your competitiveness as a UIUX designer with differentiated results utilizing interactions.

✅ Out of the entire series (1) ~ (7), (4) data structure, algorithm, object-oriented, programming language ✅ CS101 series lectures - From basic computer theory to the latest practical examples - Provides a wide range of basic knowledge

Let's create a hearing aid app using Android Studio App. I will share the project preparation and progress process so that it can be helpful to those preparing for the contest with the work that won the contest.

A Java advanced project course for beginner developers who want to develop practical skills! We'll build a console-based kiosk ordering system together using Spring Core, JdbcClient, and H2 DB.

<25 English Technical Interview Questions and Answers by a Local Java Developer in Australia> is for everyone who wants to work as a Java programmer. As Java is a computer language with steady demand worldwide, this course will serve as a useful guide for practical interview preparation, not only for those seeking employment abroad but also for those looking for jobs domestically.

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.

This is a course on understanding Java design patterns. It helps you learn about various design patterns and increase your understanding of design patterns. A course that explains Gof Design Pattern in Java. I tried to prepare meaningful and easy examples.

Learn the SAGA transaction management technique for maintaining data consistency in distributed environments through a hands-on approach. You will configure three microservices using Spring Boot and Docker, and implement both Orchestration and Choreography patterns using Kafka and MySQL. Through this course, you will master core concepts applicable to real-world scenarios, including the operational principles of distributed transactions, designing compensating transactions, and handling fault recovery.

The 2025 Unreal Authorized Instructor – C++ Sparta Class is a free course designed to help even complete beginners with no prior programming knowledge get started easily. Rather than focusing on complex theories or difficult mathematics, it guides you to naturally master the core concepts of C++ through the experience of writing and running code yourself. By the end of the course, you will gain the confidence to write simple programs on your own.

We teach you the core principles of clean code through easy example code.