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RareSkills Web3 Blockchain Instructors 

Jeffrey is the instructor of the only two expert-level Ethereum development courses on Udemy, both of which are bestsellers. His blog on Ethereum development has significantly influenced major projects in the web3 space.

While working at, Jeffrey became the youngest Senior Engineering Manager at the company, building the video machine learning platforms and team from the ground up. He has consulted for dozens of companies, including the National Football League (NFL) in America.


He holds two patents in machine learning and has placed in the top 10 in highly competitive international machine learning contests.

Jeffrey is the founder of, a leading technical startup advisory firm in Southeast Asia consisting of expert engineering leaders from companies like Uber, Instagram, Coinbase, Apple, and others. 8020cto also provides technical due diligence for Venture Capital firms, some of which have over half a billion dollars in management.


He has a passion for learning and teaching that stretches all the way back to high school when he mentored college students in calculus. At Columbia University, he was recognized as a top teaching assistant in the computer science department and was awarded a scholarship for it.


RareSkills is now his way to share his passion for rigorous learning and subject mastery with other software engineers.

Koyuki Nakamori is a Head of Engineering at Ava Labs, the company behind the Avalanche Blockchain. Her team researches distributed and decentralized machine learning training facilitated by blockchain.


She previously was the head of engineering at Headspace where she built their ML pipelines. She has 10+ years mentoring aspiring data scientists and engineers.


Her bachelor's degree is in applied mathematics and her graduate degree is in data science and operation's research.

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