Freelancer profile translated to English.
Back to original languageAbout Mathys
Fullstack developer trained at 42 Paris, I design clear, reliable, and scalable tools, with an obsession for security and user experience.
I primarily work with C, Node.js, React, TypeScript, Prisma.
I also have Web3 expertise with several blockchains (Solana, XRPL, EVM).
I have won several Web3 and AI hackathons (ETHGlobal, PBW, XRPL, Kiln...) and I am part of the 42Blockchain team, where I lead technical workshops on blockchain, AI agents, and cybersecurity.
I am comfortable intervening on:
• fullstack application architecture
• blockchain integration (transaction, multisig, signature, contracts..)
• SDK/API/backend development
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 20km), Rennes (up to 10km), Quiberon (up to 10km)
Experience
- Mathys Cogne-FoucaultFullstack Web3 Developer — FreelanceSOFTWARE PUBLISHINGJune 2023 - Today (3 years and 2 months)Paris, FranceDevelopment of multi-chain Ledger authentication SDKs (XRPL, Solana, EVM)Blockchain integration with clear sign & secure flows (Solana + Squads, XRPL)Development of AI agents (transaction analysis, multisig coordination, trust score generation)Creation of Web3 interfaces (Next.js, ShadCN, Tailwind, REST/JSON)Workshops led for 42Blockchain (XRPL, GitHub API, ElizaOS, etc.)
- 42BlockchainCore Team - Events and Education ManagerEDUCATION AND E-LEARNINGFebruary 2025 - Today (1 year and 6 months)Paris, FranceOrganization and leading of technical workshops (blockchain, AI, GitHub API)Mentoring 42 students on Web3 topicsCollaboration with external partners for open source or educational projects
- XRPL CommonsXRPL Residency Program - Blockchain & AISOFTWARE PUBLISHINGApril 2025 - July 2025 (3 months)Paris, FranceSelected for a Web3 and AI builder residency program, with a focus on the XRPL ecosystem and intelligent agent applications.
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Education
- Master42 Paris2025Concepteur développeur de solutions informatiques – Software engineering
- Développeur front-endOpenClassrooms2023Formation professionnalisante axée sur le développement front-end moderne avec React, les bonnes pratiques UI/UX et la gestion d’état (Redux, API REST, etc.)