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ETH-31 Certified Online Ethereum Developer Course - December

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Course Number


Classes Start


Classes End


Estimated Effort





12 week course
8-12 hours per week

Recommended Experience

1+ Years as a Developer
JavaScript, HTML, CSS, git and Linux


A computer with at least 8 GB RAM
and 50GB free hard-disk space

Getting into Blockchains is hard!

There is a whole lot of hype around Blockchain. But how does it work? What is a smart contract? Why is everyone so excited about DAOs? And what does all of this have to do with cryptocurrencies?

And most importantly, how do you program for a blockchain network?

We have spent the past couple of years developing and improving this 12-week in-depth online course to teach developers about Blockchain and how to develop decentralised applications, or DApps, on the Ethereum platform.

About This Course

This online course teaches software engineers the basics of blockchain technology as well as languages and tools required to build decentralised applications on the Ethereum platform. This course is aimed at experienced programmers, introducing everything needed to understand the technology, write smart contracts and build applications that interact with them.

Participants will learn about the Ethereum platform, the programming language Solidity, how to use web3 and the Truffle framework and lastly, how to tie everything together. Step by step, participants build a fully functioning decentralised application, deploy it and test it.

This course was developed in response to the daily requests we receive for expert developers in blockchain projects.

Someone needs to build it

The infrastructure of tomorrow needs sound developers. Stay ahead.

Enroll Now!

Course Curriculum

Project Work

This project(s) work will guide you through the steps required for the development of a sophisticated decentralised application, including a smart contract backend system and a full frontend. You get one full week for each project. That is how much we think they matter.

Project 1

This contrived first project deals with Ether transfers. You will get in touch with basic Solidity syntax, and work with basic transactions and smart contract interaction concepts. You are going to learn how to transform a narrow-use smart contract into a global utility, how to protect your users and how to protect your smart contract from your users.

Project 2

The second project demonstrates, by trial and error, how the public nature of Ethereum, gas price and mining delays cannot be ignored when coding in Solidity. This project looks and feels more real-life than the first project. Further, you will learn the art of balancing interactions and actions between client-side and chain-side. If you choose to, you will be able to adjust the specifications to your liking and, for instance, experiment with multi-contract interactions or attempt a rudimentary business model.

Project 3

The third project is a well-known child's game that, although disarmingly simple, requires careful considerations when played on Ethereum. You will reapply teachings learned in the previous projects while ensuring you do not ruin your players' finances. How low can you go?

Spot Challenges

In addition, you will be presented, out of the blue, with a few challenges that, when completed, give you the opportunity to not only brag, but also reconsider your assumptions.

Challenge 1

You can hammer out a transaction. But can you chisel a transaction?

Challenge 2

Can you guess randomly generated numbers? Should you speed-read a smart contract, or take your time?

Challenge 3

Don't you like it when money appears in your wallet out of nowhere?

Challenge 4

You read about contract exploits, but can you exploit one yourself?

Teaching & Communication

We offer a dedicated Slack channel for all students to collaborate with your classmates and instructors. Classmates and instructors engage in active tutoring to guide you through the lessons and help one another.

Our instructors tutor and mentor throughout the course duration and during the exam period to help clarify course content and assist students with reaching their individual learning objectives at their pace.

Your course team

Xavier Lepretre Image

Xavier Lepretre

Xavier is a software and infrastructure engineer. In the past 15 years, he has coded, deployed, customised, troubleshot, and supported various software systems. He has also guided, educated, taught, and coached customers across Asia. Xavier used to be based in Thailand and Singapore. For more than two years now, he has been a keen member of the blockchain community.

Rob Hitchens Image

Rob Hitchens

Rob has worn many hats in his extensive IT career including experience designing, constructing, implementing and operating innovative software solutions, developing training programs and supporting online education platforms. Rob has been dabbling in blockchain technology since the early days and quickly recognised the disruptive potential of Smart Contracts and decentralised apps. Since 2016, Rob has been absorbing all things related to Smart Contracts and supporting developers on their quest to master this technology.

Elias Haase Image

Elias Haase

Elias has been spending the past 10 years planning, building and running applications. His background is in Artificial Intelligence. Since the early days of bitcoin he has been following the progress of blockchain tech and has been gathering experience with smart contracts / trustless computation since late 2014.

Ibo Sy Image

Ibo Sy

Ibo is a software engineer and entrepreneur with extensive experience in native desktop, web and mobile application development. He has worked on 3D Virtual and Augmented Reality projects and has a knack for embedded systems. He has been delivering software projects for 10 years.


B9lab awards certificates to participants who show very strong ability and understanding during the course. The pass mark is fairly high and requires an average of 80% or more. Successful participants receive a certificate that is verified on the Ethereum blockchain and looks like this self-awarded one.

Exam and Timeline

At the end of the 12 week course, participants can decide on the date of their exam within a 12 week window.

Like what you see?

We'd love to have you on the course!