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Lionel BeltrandoLB

Lionel Beltrando

Blockchain AI Consultant | PhD

€650/day
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Lionel

Technical and strategic consultant specialized in blockchain and emerging technologies, I assist companies and financial institutions in consulting, architecture, and audit missions — from the exploration phase to production. My positioning is based on a rare combination: an excellent academic background — PhD in Computer Science from Sorbonne University, with a thesis on the design of low-energy blockchain protocols for the financial sector — and nearly 7 years of practical field experience through concrete missions at Thales, Archos, and Finaxys. This dual culture of research and operations allows me to rigorously address both technical subjects — Solidity smart contract development, protocol architecture, decentralized system audits — and more strategic issues: technological choices, feasibility assessment, decision support. I also train technical and business teams on blockchain, with a pedagogical approach built over time and adapted to various audiences. Passionate about artificial intelligence, I closely follow its advancements and their practical applications in business — especially at the intersection with decentralized systems, a field of innovation that I naturally integrate into my thoughts and missions. Key skills: Blockchain · Smart Contracts · Solidity · Ethereum · Cryptography · Decentralized Architecture · Web3 · Applied AI · Technology Consulting · Training
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km)

Experience

  • Finaxys
    PhD Student Cifre
    February 2021 - December 2025 (4 years and 10 months)
    Puteaux, France
    As part of a CIFRE agreement between Sorbonne University and Finaxys, I conducted applied research on Byzantine Fault Tolerance (BFT) consensus protocols for the financial sector. I designed and developed TenderTEE, an energy-efficient BFT protocol reducing energy consumption by about 50% compared to existing solutions, incorporating a tri-party governance structure adapted to the constraints of financial institutions. This work resulted in three scientific publications, including an article in the journal Theoretical Computer Science. I also ensured the transfer of results to Finaxys' business teams, translating fundamental research issues into recommendations applicable to the fintech sector.
    Blockchain Decentralized Finance Cryptography Web3 Scientific Publication
  • Finaxys
    Blockchain Engineer
    November 2019 - February 2021 (1 year and 3 months)
    Neuilly-sur-Seine, France
    Blockchain R&D, training, overseeing a blockchain project in a team of 4, blockchain acculturation through presentations to various audiences.
    Smart Contract Training
  • Archos
    Blockchain Development Engineer
    November 2018 - November 2019 (1 year)
    Igny, France
    • Participation in the architecture and development of a hardware wallet, integration of cryptocurrencies (Bitcoin, Ethereum, Litecoin, Erc20); Development of a secure graphical interface (PIN code, seed recovery...)
    Language C Hardware Wallet Cryptography ERC20 Bitcoin

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Education

  • Master of Mathematics
    Sorbonne University
    2025
    Master Mathématiques
  • null
    Sorbonne University

Skill set

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