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JC

Jean Cavallera

Senior Smart Contract Engineer / Solidity Protocol Engineer

๐Ÿ“ Marseille, France

๐ŸŸขAping In

Senior smart contract engineer with 8+ years of experience in web3 protocol design and decentralised applications for EVM blockchains. Architects complex systems from design to deployment and iterative upgrades. Combines engineering expertise with academic education in Business Management & Entrepreneurship to help projects develop innovative Web3 products, from concept to product-market fit.

Work Preferences

Salary

USD 140,000 โ€“ 200,000

Skills

Solidity10/10
Smart Contract Development10/10
Foundry9/10
Fuzz / Invariant Testing9/10
EVM / EVM Opcodes9/10
Proxy Patterns (EIP1967, EIP1167, Diamond) (9/10)Liquid Staking Tokens (8/10)TypeScript / Node.js (8/10)CI/CD / GitHub Actions (8/10)Cross-chain Bridges / Hyperlane (8/10)DeFi Protocols (Aave, Uniswap, Lido, RocketPool) (8/10)ethers.js / viem / wagmi (8/10)Hardhat (8/10)AI Tooling (Copilot, Claude Code, CodeRabbit) (7/10)React / Next.js (7/10)Project Management (ClickUp, Notion, Asana) (7/10)EigenLayer AVS (7/10)PHP / SQL (6/10)Python (5/10)Rust (4/10)

Work Experience

Senior Solidity Protocol Engineer (Smart Contract Team Lead)

LUKSO

Aug 2021 โ€” Present

Architected and released 20+ smart contract standards in Solidity for EVM blockchains including smart accounts, permission management, notification systems, gas-sponsored relay transactions, tokens and NFTs. Led a team of 4 smart contract engineers, managed CI/CD pipelines for 10+ repositories, led cross-chain bridge development between Ethereum and LUKSO mainnet, developed a non-rebasing Liquid Staking token, built libraries and debugging tools, and provided developer relations and technical advisory for external partners.

Blockchain & Smart Contract Engineer

Extropy.io

Oct 2019 โ€” Jul 2022

Smart contracts development in Solidity including policy enforcement for wallets and yield strategies via DeFi adaptors (Aave v2, Harvest Finance, Barnbridge, DyDx). Prototyped a mobile app in React Native for car interaction via Bluetooth and smart contracts on a private EVM network. Supported implementation of Proof of Kernel Work (PoKW) in Go. Built lecture material for Beginner & Advanced Solidity Bootcamps by Encode.

Full Stack Web Developer, Project Manager

Gerrards (Precious Metals) Ltd

Jun 2018 โ€” Jul 2021

Led development of an eCommerce website (WordPress + WooCommerce) for investment bullion, generating 3.5 million GBP in sales revenue. Tech stack: PHP, Node.js, MySQL, React, Express, Bootstrap. Implemented real-time product pricing via Server-Sent Events, live precious metals REST API, and KYC/AML solution at checkout.

Assistant Manager

Orobel Sprl

Jan 2015 โ€” Jun 2016

Developed a new website and online shop (WordPress and WooCommerce) generating 2.5 million EUR in sales revenue. Managed purchasing office for buying and selling precious metals and bullion. Commercial prospection in France visiting ~50 suppliers. Melting of gold/silver in induction furnaces, X-ray spectrometer analysis, and writing SEO articles for bullion investors.

Education

Uniswap

Uniswap v4 Incubator

2025 โ€“ 2025

Encode Club

Advanced Solidity Bootcamp

2021 โ€“ 2021

Loughborough University, London

Master's ยท Entrepreneurship, Finance & Innovation

2016 โ€“ 2018

Kedge Business School

Bachelor's ยท Business & Management

2012 โ€“ 2016