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build-your-own-x: Learn by Recreating

Name: build-your-own-x: Learn by Recreating
Author: codecrafters-io

Improve programming skills by rebuilding tech from scratch. For startup founders and programmers.

advanced⏱ 1-2 days💵 Free

543,033 stars51,212 forksMarkdownHealth Score 9/10Updated 7/14/2026100% free · open source

What it is

Create replicas of your favorite technologies from scratch.

What you can make with it

Reproductions of complex technologies like Instagram, YouTube, or Netflix, allowing you to deeply understand how they work.

How it helps

Mastering programming by building entire systems helps developers learn complex concepts and gain hands-on experience.

Real use case example

"A founder wanting to understand how their favorite SaaS app handles user authentication can rebuild it using this skill."

If you're new

This skill is perfect for beginners looking to learn complex concepts through practical experience.

If you're senior

Senior developers can use this skill to deepen their knowledge of software development and system design.

Common confusion cleared up

Don't worry if you're not sure where to start - the skill's purpose is to guide you through the process of recreating popular technologies.

Best inside these AI tools

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Pairs with

Stripe webhookNotion database

Why we list it on WorkflowStacks: Our marketplace offers this skill as a resource for developers to improve their skills through self-directed projects.

What it does

Build-your-own-x helps startup founders master programming by guiding them to recreate their favorite technologies from scratch

Install / run

Visit https://github.com/codecrafters-io/build-your-own-x and follow the repository's instructions to get started

When to use it

•When you want to deeply understand how a specific technology works
•When you're looking to improve your programming skills through hands-on exercises
•When you need to customize or extend an existing technology for your startup

Quick start

1Explore the repository's various 'build-your-own' guides, such as building a Redis or a React from scratch
2Choose a guide that aligns with your interests and skills, and follow the step-by-step instructions
3Use a Markdown editor or viewer to easily read and navigate the guide's Markdown files
4Start with the basics and gradually move on to more complex projects, using the guide's code examples and explanations as references
5Join the community or forums associated with the repository to ask questions and get help when needed

Ready-to-paste prompt

Start with the 'build-your-own-redis' guide by navigating to the corresponding Markdown file and following the instructions to recreate a simplified version of Redis

Heads up: Make sure you have a good understanding of programming fundamentals and the specific technology you're trying to recreate, as the guides assume a certain level of prior knowledge and may not provide extensive explanations of basic concepts

Saves to your device

Topics

awesome-list

free

programming

tutorial-code

tutorial-exercises

tutorials

How build-your-own-x: Learn by Recreating works

Codeflow

Free to inspect

Build-your-own-x: Learn by Recreating is a documents-only repository (2 doc files) — something you read, not something you run. There is nothing to install. Last commit a month ago, no license file.

Size

Documents only

2 documents · 10 min skim

Setup

Nothing to install

A guide / curated list. Just read it and follow the links.

Runs on

Nowhere — you read it

A reading resource, not a program.

Markdown 100%

Where to start reading