Antoine Estienne
Founder at Freelance
Paris, Ile-de-France
Summary
🤩
Rockstar🎓
Top SchoolAntoine Estienne is a founder and seasoned blockchain engineer with eight years of experience building and securing EVM and Substrate-based systems from Paris. He has shipped production smart contracts across seven mainnets, led backend and full-stack work for Moonbeam and polkadot-js (including Ethereum address support and Moonbeam precompiles), and contributed cryptography and signature/HD-derivation support to core polkadot-js libraries. As a technical lead and advisor he's designed DID/ZK-proof identity flows, deployed audited access-gated contracts used in production, and operated APIs serving tens of thousands of users. His skillset spans TypeScript, Solidity, Node, React and low-level blockchain client work, with a consistent emphasis on security testing and stability (e.g., block-limit and infinite-loop protections). Now running The Guild and freelancing, he blends open-source collaboration with hands-on product delivery for DAOs, NFTs and cross-chain tooling. An engineer with both startup and enterprise pedigree, he pairs protocol-level contributions with practical, user-facing product outcomes.
8 years of coding experience
8 years of employment as a software developer
Baccalauréat S (spé Science ingénieure), Baccalauréat S (spé Science ingénieure) at Lycée Jean-baptiste SayMaster in Science and Executive Engineering Science Management Engineering, Master in Science and Executive Engineering Science Management Engineering at Mines Paris - PSLMPSI-MP*, MPSI-MP* at Lycée Louis-Le-Grand(Exchange Student) Mechanical Engineering and Business, (Exchange Student) Mechanical Engineering and Business at Shanghai Jiao Tong University
français/french, english/anglais, deutsch/german, Japanese, Chinese
Github Skills (19)
substrate10
javascript10
it-security10
typescript10
ui-design10
security10
uid10
polkadot-js10
front-end-development10
ethereum10
cryptography10
typescript-types10
blockchain10
rust10
typescripts10
Programming languages (14)
Github contributions (5)
moonbeam-foundation/moonbeam
Nov 2020 - May 2022
An Ethereum-compatible smart contract parachain on Polkadot
Role in this project:
Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:190 reviews, 97 commits, 155 PRs in 1 year 6 months
Contributions summary:Antoine primarily contributed to the backend by introducing changes to the blockchain's chain specifications, which includes adding functionalities like support for 18 decimal places for tokens. Further work involved developing new features for the front-end using Javascript types and rpc decorators, as well as adding and testing security measures to ensure the blockchain's robustness and stability. The user also introduced security tests related to block limits and infinite loop execution.
ethereumpolkadotsmart-contractsmoonbeamsubstrate
polkadot-js/apps
Nov 2020 - Jan 2022
Basic Polkadot/Substrate UI for interacting with a Polkadot and Substrate node. This is the main user-facing application, allowing access to all features available on Substrate chains.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:44 reviews, 46 commits, 53 PRs in 1 year 2 months
Contributions summary:Antoine primarily contributed to the UI of the Polkadot/Substrate application, focusing on adding and supporting features related to the Moonbeam network. Their work involved implementing Ethereum address support, adding Moonbeam configuration and RPC methods, and integrating Moonbeam-specific types. They also addressed UI elements related to account creation and verification, including changes to the signing and import functionalities. Furthermore, they were involved in updating the application to utilize the latest moonbeam types bundle.
polkadotsubstratepolkadot-jsuiblockchain
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