Freelancer profile translated to English.
Back to original languageAbout Martin
My name is Martin Barral, I am 28 years old and based in Lyon / Tenerife / Paris.
Smart contract developer and blockchain architect, I specialize in stablecoin infrastructure, agentic payments, and AI-assisted smart contract auditing.
Before Web3, I spent four years building production software, primarily enterprise ERPs in Java and SQL. This period taught me to deliver reliable, tested, and maintainable code, and it's this rigor that I find today in on-chain development.
For the past three years, I have been building Web3 projects end-to-end, from Solidity contracts to TypeScript/React interfaces and the backend services that connect them.
I am particularly active on Arc, Circle's stablecoin L1, and on Hedera, with projects delivered in cross-chain payment gateways, x402 micropayments, AI-driven security auditing, and DeFi automation.
I enjoy concrete projects and short formats, and it's often in hackathons that I build my best ideas. My most accomplished project to date is ArkAge, a trading protocol between AI agents on Arc, and I was also awarded at ETHGlobal Cannes 2026.
I work remotely and spend part of the year in Tenerife, in French, English, or Spanish.
I am open to freelance missions as well as full-time remote positions, in stablecoin infrastructure, agentic trading, DeFi, and full-stack Web3 development, and I am still open to a hybrid or on-site mission if it is interesting.
If you are building anything in these areas, please don't hesitate to reach out.
French
Native or bilingual
English
Native or bilingual
Spanish
Conversational
Can work on-site
Paris (up to 50km), Lyon (up to 50km), Bordeaux (up to 50km), Toulouse (up to 50km), Bayonne (up to 50km)
Experience
- FreelanceSmart Contract / Backend Web3 DeveloperSeptember 2024 - Today (1 year and 9 months)Lyon, FranceSmart contract developer and blockchain architect building complete dApps end to end. Core expertise in Solidity, Foundry, and EVM, with full-stack delivery in TypeScript/Next.js. Built ArkAge (AI agents that hire, pay, and judge each other in USDC on Arc, 487+ on-chain settlements), StabL (stablecoin payment gateway, 60-80% gas savings), and KronoScan (AI auditor with x402 micropayments). ETHGlobal Cannes 2026 prize winner. Open to freelance and contract work across smart contracts, full-stack Web3, and DeFi.---------------------------------------------------------------------------Smart contract developer and blockchain architect, I design and develop complete dApps from end to end. My core expertise: Solidity, Foundry, and EVM, with full-stack mastery in TypeScript/Next.js. I have notably created ArkAge (AI agents that recruit, pay, and evaluate each other in USDC on Arc, over 487 on-chain settlements), StabL (stablecoin payment gateway, 60 to 80% gas savings), and KronoScan (AI smart contract auditor with x402 micropayments). Awarded at ETHGlobal Cannes 2026. Available for freelance missions in smart contracts, full-stack Web3 development, and DeFi.
- AKUITEOFull-Stack Software DeveloperSeptember 2018 - September 2022 (4 years)Lyon, France
- Designed and implemented custom ERP protocols in close collaboration with enterprise clients, translating business requirements into technical solutions
- Developed full-stack applications using Java, SQL, and AngularJS, handling both backend business logic and frontend user interfaces
- Built RESTful APIs and designed database schemas for multi-user enterprise applications
- Collaborated in Agile teams, conducting code reviews and ensuring code quality across the development lifecycle
- Gained strong foundation in stateful systems, concurrent programming, and production-grade software architecture directly applicable to smart contract development
---------------------------------------------------------------------------- Conçu et implémenté des protocoles ERP sur mesure en étroite collaboration avec des clients grands comptes, en traduisant leurs besoins métier en solutions techniques
- Développé des applications full-stack en Java, SQL et AngularJS, en gérant aussi bien la logique métier côté backend que les interfaces utilisateur côté frontend
- Développé des API REST et conçu des schémas de base de données pour des applications d'entreprise multi-utilisateurs
- Travaillé en équipes Agile, en réalisant des revues de code et en garantissant la qualité du code tout au long du cycle de développement
- Acquis de solides bases en systèmes à état, programmation concurrente et architecture logicielle de niveau production, directement applicables au développement de smart contracts
- LEADERGAMEC++ Software Developer InternFebruary 2018 - April 2018 (2 months)Écully, France• Developed VR-oriented serious games using C++, gaining experience in performance-critical programming
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Education
- Blockchain & Smart Contract DevelopmentCyfrin Updraft2025Blockchain & Web3 Development : Comprehensive curriculum covering Solidity, smart contract security, gas optimization, DeFi protocols, cross-chain development, and ZK cryptography
- Master in Computer Engineering Expert - RNCP Level 7EPSI2021Five-year engineering program specializing in software development, architecture, and systems engineering
Certifications
- Advanced FoundryCyfrin Updraft2025
- Blockchain FundamentalsCyfrin Updraft2025