Open to opportunities

Jaf User

@jafuser

Team Lead at Ethereum Foundation and CTO & Co-Founder of BetSell Marketplace, creating a marketplace for digitally certified bet payout rights.

Costa Rica

Message

At Ethereum Foundation, I’m currently a Team Lead, after working in Ecosystem Development. I also serve as CTO & Co-Founder of BetSell Marketplace, a Web 2.5 marketplace for buying, selling, and auctioning the payout rights of bets as digitally certified assets.

Previously, I was a Core Team Member & DAO Lead at Push Protocol | Previously EPNS, a decentralized communication protocol that lets services send notifications to users’ wallet addresses. Earlier in my career, I worked in software engineering, product management, infrastructure, and application development.

Experience

Work history, roles, and key accomplishments

Current

Team Lead

Current

Ethereum Foundation

Jun 2025 - Present (1 year 4 months)

Worked as Team Lead at Ethereum Foundation.

Current

CTO & Co-Founder

Current

BetSell Marketplace

May 2024 - Present (2 years 5 months)

BetSell.com is a Web 2.5 marketplace that enables users to buy, sell, and auction the payout rights of their bets as digitally certified assets. By offering a seamless and secure platform, BetSell empowers users to trade their betting tickets globally, while providing sportsbooks with an innovative way to expand their reach and engage with new audiences. By combining blockchain technology with tra

Ecosystem Development

Ethereum Foundation

Feb 2024 - Jun 2025 (1 year 4 months)

Worked as Ecosystem Development at Ethereum Foundation.

Core Team Member & DAO Lead

Push Protocol | Previously EPNS

May 2020 - Jan 2024 (3 years 8 months)

Push is a decentralized communication protocol. Using the protocol (smart contract) any services (web3, dApps, smart contract or anyone else) can send notifications out to their users (wallet addresses).