Jordi Baylina
Blockchain Developer
Jordi Baylina is a blockchain developer and telecommunications engineer, one of the most respected technical voices in the Ethereum ecosystem in Spain. He has designed widely reused contracts — such as MiniMe — co-founded Giveth and DAppNode, and led iden3, Hermez Network, and the deployment of Polygon’s zkEVM. He contributes to Circom and SnarkJS, reference tools for privacy and zero-knowledge proofs. His code and audits are publicly verifiable reference material. He is consulted to explain network upgrades, smart contract security, and the transition to Proof of Stake.
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About Jordi Baylina
Jordi Baylina is one of the most recognised Spanish-speaking blockchain developers and a technical reference within the Ethereum ecosystem. A telecommunications engineer by training, he has spent years building smart contracts, open-source tools, and protocols now used by projects such as Status, Aragon, and district0x. His profile combines implementation, security auditing, and a vision of how decentralised infrastructure evolves. Since Ethereum’s early years, he has contributed widely adopted infrastructure pieces such as the MiniMe contract and cryptographic libraries in Solidity. He also co-founded community-oriented initiatives including Giveth and DAppNode, and took part in the technical response to TheDAO hack in 2016. Those experiences shaped his focus on security, transparency, and public network resilience. Over the past decade he led the development of iden3, focused on self-sovereign identity and privacy, and created Circom and SnarkJS, standard tools for designing zero-knowledge circuits. As founder of Hermez Network, he drove one of the first ZK rollups on mainnet; the project was integrated into Polygon, where he directed the deployment of the zkEVM compatible with Ethereum contracts. Vitalik Buterin executed the first transaction on that network — a milestone reflecting the technical weight of his work. In Spain and Europe, Baylina is consulted when Ethereum upgrades — Proof of Stake, scalability, and new smart contracts — need to be explained with rigour and without oversimplification. His publishable GitHub track record and conference appearances such as EthCC position him as a verifiable authority for anyone seeking reliable context on ETH, Bitcoin, and on-chain privacy.
Professional milestones
- Developed the MiniMe contract and Solidity cryptographic libraries adopted by Status, Aragon, and district0x.
- Co-founded Giveth and DAppNode, community infrastructure for donations and Ethereum nodes.
- Technical participation in the response to TheDAO hack (2016) from the white-hat side.
- Created Circom and SnarkJS; led iden3 in self-sovereign identity and privacy.
- Founded Hermez Network, a ZK rollup integrated into Polygon; technical lead for zkEVM on mainnet.
- Security audits and reviews for projects such as MakerDAO, Aragon, and Ethereum ecosystem token sales.
Areas of expertise
- Smart contract development on Ethereum
- Zero-knowledge proofs (ZK) and rollups
- Decentralised identity and on-chain privacy
- Smart contract security and auditing
- Ethereum scalability and protocol upgrades
Frequently asked questions about Jordi Baylina
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