Quentin Chabert
Senior Blockchain Engineer | Smart Contracts
Salaire / Taux journalier
Paris, France
Freelance
Peut venir sur site
Expertises
Langues
À propos
Introduction
Senior Blockchain & Full-Stack Engineer with 8+ years specializing in Web3 solutions and smart contract development. Former CTO at OWNEST, led teams of 10 engineers and delivered blockchain-based systems for major clients like SNCF, Orange, and Saint-Laurent. Expert in Solidity, TypeScript, React, and Node.js—ready to build secure, scalable decentralized applications tailored to your business needs.
Expérience de travail
Freelance Software Engineer
janv. 2025 - Présent
1 an 10 mois
Freelance in development, especially topics related with blockchain, security and full-stack development.
OWNEST
févr. 2018 - janv. 2025
7 ans
Paris, France
CTO
août 2018 - janv. 2025
6 ans 6 mois
Paris, France
• Led technical team (up to 10), managed architecture, security, CI/CD, back-end optimisation • Architected fullstack solutions: Vue.js/React.js frontends, Nest.js/Express backends, PostgreSQL/MongoDB databases, GraphQL APIs, real-time WebSocket connections • Developed responsive PWAs and native apps with complex state management, real-time updates, and optimized user workflows for logistics and NFT operations • Built multi-chain Web3 infrastructure (EVM) with 99.9% uptime: RPC fallbacks, event indexing, reorg handling, wallet/transaction logic, automated blockchain event analysis • Designed complex smart contracts: factories, multi-sig custody, upgradeable proxies, role based advanced control, off-chain steps, advanced testing and gas optimization • Delivered solutions for 15+ enterprise clients across retail, luxury, transport sectors Projects • Ownest: blockchain-based logistics traceability system with immutable audit trails, automated dispute resolution, and event-driven state management • Owalt: NFT platform providing creation, administration, and marketplace tools for non-tech user • NACK: predictive AI algorithm generating delivery confidence scores from historical data • Polstaking: Polygon validator dashboard for real-time staking analytics & delegation incentives
Software architect
févr. 2018 - août 2018
7 mois
Paris Area, France
Using the technology to meet our clients' needs: - Developing smart contracts - Managing operations on Ethereum - Developing the API - Designing new solutions
Intern Blockchain Dapp Developer
Ledgys
mars 2017 - août 2017
6 mois
Paris Area, France
Dapp (distributed app) dev: Mobile Dapp lead developer on blockchains Devops: Management of the servers and applications in production Technologies used: - Node - MongoDB - ExpressJS REST API - ionic / angularJs Languages used: JS / bash / Solidity (Ethereum Smart Contract) / HTML / CSS
IT Security Trainee Consultant
EY
sept. 2016 - mars 2017
7 mois
Luxembourg
Penetration Testing in the bank industry: - Data Leakage Assessment - DDOS assessment - Security assessment of web / android applications Development of: - DDOS script : Coordinator script for distributed testing with coordinated instances from Amazon Web Services (AWS) - Security assessment tools - Intern reporting tool ISO 27001 assessment Hacking lab expansion Pentesting reports reviews and creation of a vulnerability database Languages used: bash / JS / VBA / SQL / python / Ruby
Creation of a Web tool for managing intern processes
Telecom Etude
févr. 2015 - mars 2016
1 an 2 mois
Région de Paris, France
Work for Eurovia (∼150h) - Development of an internal website including front, design, database and backend Languages : PHP / HTML / CSS / JS / SQL
Formation
KTH Royal Institute of Technology
Exchange , Computer and Information Systems Security, Blockchain, AI, Machine learning
2017 - 2018
2 ans
Telecom ParisTech
Bachelor of Science (B.S.), Sécurité / sûreté de l''information des systèmes informatiques, Entreprenariat
2014 - 2017
4 ans
Télécom Paris
Master of Engineering - MEng
2014 - 2017
3 ans 2 mois
EURECOM
Master's degree, Computer and Information Systems Security/Information Assurance
2015 - 2016
2 ans
Lycée Descartes, Tours
MPSI-MP*
2012 - 2014
3 ans
Lycée Descartes, Tours
Baccalauréat, Mathématiques
2009 - 2012
4 ans
Portfolio
DEX aggregator
