What You’ll Gain Inside the Course

Learn the patterns, trade-offs, and production mindset behind professional frontend architecture — from modeling data and fetching efficiently to releasing features safely and understanding how they behave in production.

  • Confidence to design frontend systems with clear data flows, state boundaries, and trade-offs.

  • A practical framework for data modeling, fetching, mutation, rendering, and production readiness.

  • Hands-on practice with real-world patterns you’ll actually use at work.

  • A capstone project you can discuss in interviews, design reviews, or performance conversations.

  • The mindset to reason about requirements, release risk, observability, and rollback like a senior frontend engineer.

Watch the introduction

Discover what you’ll learn in this course in just 2 minutes

Course curriculum

    1. Welcome & Course Roadmap

    2. Course Starter Repository

    3. Walk Through the Starter Project

    4. Checkpoint: Rendering Your First Avatar from the API

    5. How to Learn Effectively in This Course

    6. Frontend System Design Common Pitfalls

    1. Thinking Like a Frontend System Designer

    2. Ask Better Questions Before Designing

    3. Separate What It Does From How It Behaves

    4. Practice: Turn a Vague Prompt Into Clear Requirements

    5. Find Requirements From Context

    6. Make Trade-offs Visible

    7. Communicate Your Design With CCDAO

    8. Practice: Explain a Frontend Design With CCDAO

    1. Understand Why Data Modeling Matters

    2. Case Study — Modeling “Features” on a Menu Item

    3. Normalization - Identifying the Real Problem

    4. Normalization in Practice — Step-by-Step Refactor

    5. Fixing A Defect We Introduced

    6. Checkpoint - AssigneeList — Before & After Normalization

    7. Build the AssigneeList for Real (Step-by-Step)

    8. How Backend Databases Handle Normalized Data

    9. Evaluating Trade-offs in Store Design

    10. Quiz - Data Modelling

    1. Introducing Data Fetching

    2. Requests Management: Request Cancelation

    3. Requests Management: Debounce & Throttling

    4. Quiz - Requests Management

    5. Pagination Strategies: Offest-based, Cursor-based and Infinite Scrolling

    6. Implement Pagination in The Board Application

    7. Caching Strategies in Frontend Applications

    8. Quiz - Fetching Data Efficiently

    1. Introducing Data Mutation

    2. Checkpoint - Implementing Deletion

    3. Assigning a User to a Card (Code Implementation)

    4. Real-Time Updates Patterns

    5. Real-Time Updates – Polling, SSE, and WebSockets

    6. Real-Time Updates in Action - Using Server-Sent Event

    7. Building Optimistic UI with Rollback

    8. Quiz - Mutating and Synchronizing Data

    1. Introducing Performance Enhancement

    2. Rendering With The Right Strategy

    3. Server-Side Rendering In Action

    4. Enhancing Perceived Performance

    5. Implementing Skeleton Pattern in Board View

    6. Prefetching Data When User Shows Intention

    7. Introducing Lazy Loading

    8. Checkpoint - Lazy Loading List View

    9. Measure and Improve Performance

    10. Quiz - Optimizing Performance

About this course

  • $199.00
  • 77 lessons
  • 7.5 hours of video content

Who This Course Is For

This course is designed for frontend developers who can already build React applications, but want to grow beyond feature implementation. If you have worked with messy state, unclear data flows, slow pages, fragile mutations, or design discussions where it was hard to explain the trade-offs, this course gives you a structured way to think through those problems. It is especially useful for mid-level frontend developers preparing for senior-level work, frontend system design interviews, or internal design reviews.
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Instructor

Developer / Author / Creator Juntao Qiu

Hi, I’m Juntao — a software developer, author, and creator focused on clean architecture, testing, refactoring, and frontend system design. Over the years, I’ve seen how messy state, unclear data flows, short-sighted rendering decisions, and weak release practices can make frontend applications hard to change. This course is built around those real problems. Through my books Test-Driven Development with React, Maintainable React, and React Anti-Patterns, as well as my YouTube channel I Code It, I share practical techniques for building frontend applications that are easier to understand, test, and evolve.

Think in Systems, Not Just Components

Most developers are trained to build features like search boxes or dashboards, but as apps grow these pieces don’t exist in isolation — they live inside a system of data models, fetching and mutation patterns, rendering strategies, and infrastructure. This course helps you connect those dots so you can design scalable, maintainable frontend systems instead of patching features together.
Thinking in system

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Enroll today to gain the skills, mindset, and project experience that employers look for in senior engineers.

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FAQ

  • What learning style can I expect?

    A mix of pre-recorded videos, coding assignments, quizzes, and written guides. Each module has hands-on exercises, not just theory.

  • How is this different from free YouTube content?

    My channel focuses on bite-sized tips. This course is a structured system that takes you from feature-building to system design — with projects, exercises, and a full learning path.

  • I have a frontend system design interview coming up. Will this help?

    Yes. The first module introduces a clear structure for thinking about frontend system design, which can help you organize your answers and communicate trade-offs more clearly in an interview. If you’re short on time, you can also focus on specific topics you’re less confident about, such as data modeling, pagination, caching, or performance. While system design is something you develop over time, this course is designed to help both in interviews and in real-world work.

  • What if I’m not sure I’ll like it?

    No worries — the course comes with a 21-day money-back guarantee. If you feel the course isn’t right for you, you can request a refund within 21 days of purchase, provided you haven’t gone beyond the first two modules.

  • What kind of project will I build?

    You’ll build a board-style application that evolves as you learn each concept — from data normalization to performance optimization. By the end, you’ll have a portfolio-ready project you can showcase in interviews or performance reviews.

  • What’s the time commitment?

    The course includes around 8 hours of video content, plus extra time for coding exercises, quizzes, and the capstone project. Most students should expect around 10-12 hours or more if they follow the hands-on work carefully.

  • Why is the price increasing?

    I recently added two new modules to the course: one on frontend system design mindset, and one on operating frontend systems in production. These modules expand the course beyond implementation techniques into requirements, trade-offs, communication, observability, rollout, and rollback. The current $119 price will stay available for a short final window. After that, the course will increase to $199 to reflect the expanded curriculum.

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