Julien Klepatch – Dapp 30

How to get your first job as a developer?

• 1. You need to know how to build decentralized applications on the Blockchain (Dapps)
• 2. And you need to convince company that you know 1.

Most people think that you need to move from 1 to 2. What is the point of studying this stuff if you can’t monetize it?

Let’s reverse engineer the problem.

There is a simple method to convince companies to hire you.

Most courses won’t teach you this…

My friend, the solution is to…

You can build a portfolio of applications.

A portfolio of projects is the most effective way to demonstrate your technical skills.

You don’t need to over-optimize your CV. This doesn’t work. Show your code.

What should you build?

A good portfolio has a little bit of everything to cover different uses.

That’s what it means for Ethereum Dapps.

• Financial applications (Manipulate Ether, ERC20, ICO…)
• Good knowledge of tokens (ERC20, ERC721)
• Governance (DAO)
• Game (ERC721, Crypto-collectibles)
• Generate randomness
• Importing data to the Blockchain (oracles)
• Low-level knowledge of the EVM (assembly)

Your portfolio should show you know how.

• Write safe Solidity smart contracts => smart contracts manipulate money, safety is VERY important
• Test your Solidity code => smart contracts can’t be updated, so tests are VERY important
• Integrate smart contracts with your frontend by using Web3
• Integrate frontend with wallets like Metamask
• Have a modern reactive UI, by using frontend Dapp framework like Drizzle
• Know how to use modern development tools of Ethereum

Well done! How are you going to come up with a Dapp portfolio that will satisfy all of the above conditions but also which are simple and increase in difficulty, so that you have the time to learn? Dapp 30 is a collection of 30 applications.

Dapp 30 is a course where we build 30 applications on the ethereum platform.

The course will teach you.

• How to develop advanced smart contracts with Solidity and Remix
• How to tests your smart contracts like a pro with Truffle and Openzeppelin testing utilities
• How build stunning & reactive frontend UI connected to your smart contracts, using Truffle, Web3, Metamask, React & Drizzle

Dapp 30 was built using the portfolio of Dapps and I used myself to learn and get my first Blockchain job.

There are very simple smart contracts and Dapps in Dapp 30. We increase the difficulty with Dapps like Multisig wallet, DAO, all the way up to advanced Dapps like Ebay, and ERC20ICO.

The full list of Dapps can be found if you scroll down and click on the down arrow.

It is important to have a nice Dapp portfolio, but it is also important to use the right tools and technologies. It will be difficult to be hired if you use outdated tech.

Dapp 30 covers all the latest technologies.

• Solidity, the most popular language of smart contracts
• Remix, and easy to use IDE for Solidity
• Truffle, the most popular framework for Solidity smart contracts
• Openzeppelin, a secure library for Solidity
• Web3, a library to integrate frontends with smart contracts
• Drizzle, a library to keep your frontend up-to-date with smart contracts (reactive UI)
• Javascript, React

The latest versions are used for all of these. Dapp 30 is regularly updated. Dapp 30 uses Solidity 0.5 and web3 1.2, whereas many other courses use Solidity 0.4 and web3 0.x…

Are you a builder?

There are two types of developers.

• #1 The scholars
• #2 The builders

Scholars like to study programming, but they don’t build much and don’t have the best jobs.

Builders like to build stuffs. They love the process of building and learning from it. They get better jobs.

The course is for builders.

There isn’t a long introduction with boring explanations. Give you the explanations you need as we progress, it is straight with your first smart contract.

You are never overwhelmed with too much difficulty because the course is progressive. Knowledge is delivered when it is needed.

What are the requirements?

This course is not for beginners. You need at least a year of experience to be a web developer.

You do not need to be a frontend expert to follow. You don’t need to know much about web development.

There is no requirement for experience on the Blockchain side.

There are details of what you will learn.

The tutorials will be broken down for each Dapp.

• Smart contract
• Tests
• Frontend

There is a smart contract. Solidity.

• Develop Solidity smart contract with the Remix IDE
• Deploy and Interact with smart contracts in Remix IDE
• Run a local development Blockchain in Remix IDE
• Structure of smart contracts
• Variables: string, integers, arrays, structs…
• Functions: view, public, private
• Calls vs Transactions
• Storage vs Memory variables
• Security considerations
• Test smart contracts
• Remix
• Solidity

Tests

• How to tests your Solidity smart contract with Truffle
• How to do advanced tests like time-sensitive tests
• How to use advanced testing libraries for Solidity development, like the oppezelllin test helper
• How to test ERC20 and ERC721 tokens, and many more
• Truffle
• Solidity

Frontend

• How to integrate a smart contract using Web3
• How to integrate the frontend of a Dapp with Metamask
• How to deploy to public testnet (ex: Ropsten) or Mainnet
• Truffle
• Web3
• Infura
• Javascript
• React
• Drizzle

You get access when you buy the course.

• 30 high-quality video tutorials for Ethereum decentralized applications from simple to advanced level
• Covers smart contract development (Solidity, OpenZeppelin), smart contract tests and integration with frontend UI (Truffle, Web3, React)
• Complete source code of all tutorials (git repo)
• Access to a private Telegram with other students of Dapp 30
• Lifetime support from the instructor, Julien
• Bonus 1 : mini-course on smart contract security
• Bonus 2 : mini-course on smart contract debugging
• Bonus 3 : lifetime access for course updates

Your Instructor

Julien Klepatch

Hi! I am the instructor of EatTheBlocks Pro.

I am a senior software engineer. I switched to software development 6 years ago after working in finance.

I have been building Dapps and Solidity smart contracts for several projects for the past 3 years.

EatTheBlocks is a channel for Ethereum developers. I published a course for Manning.

I contributed to the code of Drizzle and spoke at a conference.

I’ve worked as a full-stack software engineer for the last 6 years and have extensive experience with a number of programming languages. It’s Github and LinkedIn.

Course Curriculum

Introduction

• What this course will teach you?
• Who is this course for?
• How to use this course? (IMPORTANT!)
• Supported operating systems
• Installation of required tools & libraries
• Need help for the course? 24/7 support available here

Day 1 – Simple smart contract

• Smart contract (13:45)
• Tests (10:54)
• Frontend (25:15)

Day 2 – Hello World

• Smart contract (10:06)
• Tests (5:03)
• Frontend (11:30)

Day 3 – Simple storage

• Smart contract – part I (11:58)
• Smart contract – part II (5:54)
• Tests (3:34)
• Frontend (18:37)

Day 4 – Advanced storage

• Smart contract (10:32)
• Tests (12:16)
• Frontend (39:36)

Day 5 – Crud

• Smart contract – part I (9:11)
• Smart contract – part II (4:52)
• Smart contract – part III (4:36)
• Smart contract – part IV (6:02)
• Tests (15:51)
• Frontend (59:45)

Day 6 – Ether Wallet

• Smart contract – part I (4:18)
• Smart contract – part II (5:54)
• Smart contract – part III (6:46)
• Tests (22:49)
• Frontend

Day 7 – Split payment

• Smart contract – part I (5:33)
• Smart contract – part II (7:00)
• Tests (15:21)
• Frontend

Day 8: Deed

• Smart contract (11:38)
• Tests (11:39)
• Frontend

Day 9: Deed multi-payouts

• Smart contract – part I (4:29)
• Smart contract – part II (4:10)
• Smart contract – part III (6:15)
• Smart contract – part IV (6:22)
• Tests (11:45)
• Frontend

Day 10: Escrow

• Smart contract – part I (1:26)
• Smart contract – part II (10:16)
• Smart contract – part III (5:23)
• Smart contract – part IV (5:15)
• Tests (13:40)
• Frontend (15:27)

Day 11: String manipulation

• Smart contract (10:28)
• Tests (2:57)
• Frontend (13:02)

Day 12: Fibonacci

• Smart contract (7:27)
• Tests (2:08)
• Frontend (0:40)

Day 13: Multisig wallet

• Smart contract – part I (2:18)
• Smart contract – part II (7:37)
• Smart contract – part III (14:06)
• Tests (12:39)
• Frontend (21:33)

Day 14: Voting

• Smart contract – part I (6:06)
• Smart contract – part II (8:59)
• Smart contract – part III (12:29)
• Tests (16:19)
• Frontend (32:03)

Day 15: DAO

• Smart contract – part I (3:10)
• Smart contract – part II (10:56)
• Smart contract – part III (10:34)
• Smart contract – part IV (14:50)
• Smart contract – part V (16:52)
• Tests (23:21)
• Frontend (0:31)

Day 16: Loan state machine

• Smart contract – part I (13:14)
• Smart contract – part II (12:18)
• Tests (0:35)
• Frontend (0:49)

Day 17: Event organization

• Smart contract – part I (14:46)
• Smart contract – part II (9:07)
• Tests (0:34)
• Frontend (0:35)

Day 18: Lottery

• Smart contract – part I (10:52)
• Smart contract – part II (20:59)
• Tests (1:26)
• Frontend (1:21)

Day 19: Fomo3D

• Smart contract – part I (15:07)
• Smart contract – part II (16:08)
• Tests (Unpublished)
• Frontend (Unpublished)

Day 20: Rock paper scissors

• Smart contract – part I (12:21)
• Smart contract – part II (13:26)
• Smart contract – part III (15:46)
• Tests (0:36)
• Frontend (2:11)

Day 21: ERC20 token

• Smart contract (28:23)
• Tests
• Frontend (21:56)

Day 22: ICO

• Smart contract (40:00)
• Tests
• Frontend (16:17)

Day 23: ERC721 token

• Smart contract – part I (16:35)
• Smart contract – part II (52:24)
• Tests
• Frontend (1:45)

Day 24: Crypto-kitties game

• Smart contract (37:59)
• Tests
• Frontend (14:10)

Day 25: Twitter

• Smart contract (42:02)
• Tests
• Frontend (Unpublished)

Day 26: Ebay

• Smart contract (42:02)
• Tests
• Frontend (Unpublished)

Day 27: Tinder

• Smart contract (44:52)
• Tests (Unpublished)
• Frontend (Unpublished)

Day 28: Arbitrage trading with Dex Oracle Pattern

• Smart contract (45:40)
• Tests (Unpublished)
• Frontend (Unpublished)

Day 29: Assembly

• Smart contract – Beginner (25:44)
• Smart contract – Advanced (12:35)

Day 30: Decentralized Exchange for ERC20 (Beta)

• Introduction
• Architecture of Decentralized Exchanges
• Specifications of our Decentralized Exchange
• Tech stack we will use
• Smart contract – 1 – Token registry (4:01)
• Smart contract – 2 – Wallet (6:57)
• Smart contract – 3 – Integration with Dai (3:49)
• Smart contract – 4 – ERC20 tokens Mocks (1:46)
• Smart contract – 5 – Limit orders & orderbook (12:52)
• Smart contract – 6 – Market orders & order matching algorithm (17:12)
• Smart contract – 7 – Prevent integer overflow bug (8:13)
• Smart contract – 8 – List orders
• Smart contract – 9 – List tokens
• Tests – 1 – Wallet
• Tests – 2 – Limit orders
• Tests – 3 – Market orders
• Potential improvements & edge cases

Bonus 1: DeFi (Decentralized Finance) Programming

• NOTE
• Introduction to DeFi (12:07)
• Building Blocks of DeFi (10:45)
• Dai (28:28)
• Uniswap (20:32)
• Compound (29:02)
• Gnosis (36:06)

Bonus 2: Smart contract security

• 1. Overflow / underflow – problem (7:23)
• 2. Overflow / underflow – solution (6:40)
• 3. Default function visibility – problem (3:35)
• 4. Default function visibility – solution (3:27)
• 5. Front-running – problem (5:52)
• 6. Front-running – solution (4:20)
• 7. Re-entrancy attack – problem (4:10)
• 8. Re-entrancy attack – solution (3:28)

Bonus 3: Smart contract debugging

• 1. Debugging Calls vs Transactions (1:42)
• 2. Syntax, runtime and logic errors (7:14)
• 3. Debugging with syntax highlighting (10:00)
• 4. Types of runtime errors (2:59)
• 5. Debugging out of gas errors (6:55)
• 6. Debugging revert and not-an-opcode errors (7:23)
• 7. Inspect storage with calls and returns (5:48)
• 8. Debugging with require revert (8:36)
• 9. Debugging with events (9:30)
• 10. Debugging with remix debugger (10:28)
• 11. Debugging with remix debugger advanced (7:55)

Bonus 4: Drizzle

• Note
• Introduction to Drizzle (48:07)
• Advanced Drizzle (47:39)

Bonus 5: Find your first Blockchain Job

• NOTE
• Job boards for Blockchain jobs
• Solidity Interview Preparation – Easy questions (15:50)
• Solidity Interview Preparation – Intermediate questions (17:19)
• Solidity Interview Preparation – Difficult questions (8:14)