Career Profile
12+ years experienced Software Engineer with a strong background in FinTech and Blockchain. Led the development of a €9M+ funded B2B spending & treasury management platform at Multis. Proven track record in team leadership, innovative solutions, and technology exploration.
Since 2016, I am an active member in the Blockchain and cryptocurrency space and more precisely within the Ethereum community, I am a true believer of digital decentralization, especially in Finance and a privacy advocate.
My key values revolve around team spirit, open-source, transparency and knowledge sharing. I am a constant learner, problem solver and hard worker who loves contributing to something greater than me.
Before moving to the blockchain space, I worked in Finance and IT as Lead Developer, Software Architect and Technical Manager in Europe (London, Paris, Brussels) for large and small companies in a wide range of areas (Finance, Insurance, Energy, Media).
In my free time, I appreciate traveling and discovering new cultures, going out with friends for a beer or a movie, playing Jazz music and building personal projects with Raspberry Pi.
Last but not least, I am a proud husband & father, and happy owner of a lovely Dachshund.
Professional Experiences
Safe • Tech Lead (Apr. 2024 to present)
Safe is the leading smart account infrastructure in the Ethereum ecosystem, enabling secure, modular, and programmable asset management.
As the Tech Lead for Safenet¹, I am working on the development of a chain abstraction protocol that enhances the security and usability of smart accounts. Safenet enables seamless cross-chain transactions, collateralized execution, and advanced transaction validation. My role includes designing the architecture, leading development efforts, and ensuring robust security mechanisms to improve user experience and interoperability across blockchain networks.
¹Safe (dec. 2024) · Introducing Safenet
Multis • CTO (Apr. 2021 to Apr. 2024) & Lead Engineer (Apr. 2020 to Mar. 2021)
Multis (acquired by Safe¹) is a B2B spending & treasury management platform for crypto-native businesses leveraging crypto-currencies and Decentralized Finance (DeFi)². Trusted by 250+ businesses
• Responsible for building and maintaining our products and infrastructure
• Hired and led a world-class engineering team (7 engineers)
• Implemented assets & transactions monitoring for 10+ Blockchains (including Ethereum, Polygon & Bitcoin), 50+ Exchanges (via Vezgo), and 10k+ financial institutions (via Plaid and Powens). 10M+ transactions recorded
• Implemented a cryptocurrency payment module on top of 8 Blockchains (including Ethereum, Polygon, and Arbitrum) leveraging SAFE (multi-signature), Metamask, Web3Auth, and Ledger. $200M+ payout
• Integrated a Bank-as-a-Service provider (SynapseFi) enabling bank accounts, cards, and on/off-ramp³.
• Multis is backed by investors including Sequoia Capital, Coinbase Venture and Y Combinator⁴.
• Technologies: TypeScript, NestJS, Ethereum, SAFE, Clojure(Script), Re-Frame, Tailwind, GCP, Firebase, PostgreSQL, Redis
¹Safe (apr. 2024) · Multis Team Joins Safe to Build Cross-Chain Smart Wallet Infrastructure
²TechCrunch (feb. 2022) · Multis wants to build the financial backbone of crypto-native organizations
³TechCrunch (sept. 2020) · Multis is a business bank account for cryptocurrencies
⁴TheBlock (nov. 2022) · Sequoia-backed Multis rolls out corporate cards to facilitate crypto treasury spending
Kauri • Senior Software Engineer / Co-Founder (Oct. 2017 - Apr. 2020)
Kauri was a project incubated by ConsenSys (Blockchain startups studio) aiming to improve the onboarding experience for web3 developers with a platform to learn, share, contribute, and maintain high-quality technical content¹. 5000 articles published by 1000 contributors
• The platform was built on top of decentralized technologies securing data on IPFS and Ethereum to bring trustless content ownership, content incentivization, and an open-by-default API to distribute content².
• Kauri.io and Consensys also strived to promote educational content to beginner and advanced Blockchain developers online or IRL (events, conferences, hackhaton)³.
• Worked on Protocol Design, Backend & Frontend development, infrastructure, and content strategy.
• Technologies: Java, SpringBoot, TypeScript, NextJS, Ethereum, Solidity, IPFS, Kafka, ElasticSearch, MongoDB, GCP, K8S
¹ConsensSys (mar. 2018) · Kauri: The Knowledge Network for the Ethereum Ecosystem
²YouTube (mar. 2018) · Joshua Cassidy of Kauri.io · Talks About Curating Open-Source Knowledge
³TheNextWeb (dec. 2018) · ConsenSys teaches devs how to make their first dApp on the blockchain
Ai-London • Tech Lead / Head of Innovation (Jan. 2016 - Oct. 2017)
Ai-London (acquired by Lumera¹) is a Life, Savings, and Investment software provider offering financial institutions across the world a large range of financial software.
• 2016 - Worked as Head of Middleware (Team Lead of 5 developers) for Ai-PAS, an end-to-end modular Policy Administration System.
• 2017 - Worked as Head of innovation exploring in collaboration with the CTO, new technical areas relevant to the Insurance & Financial industry such as Big Data, Machine Learning, and Blockchain.
• Technologies: Java, Spring, JBoss, Javascript, Angular, Keycloak, OracleDB, Ethereum
¹https://lumera.com/en/news/lumera-acquires-and-invests-in-ai-london-for-continued-european-expansion
RS2i • Software Engineer & Junior Manager (Feb. 2011 - Dec. 2015)
RS2i is a consultancy firm based in Paris, specializing in Enterprise solutions (BPM, ESB, ECM, Big Data) for medium to large companies across Europe.
• Worked as Software Engineer, Architect, or Technical Manager for several customers in a wide range of industries (Finance, Insurance, Energy, Transport, Media).
• Specialized in Java J2EE and TIBCO solutions integrations
Public Appearances
🎙 Podcasts
• 🇬🇧 Off-Chain Podcast #050 Greg Jeanmart: Revolutionising Cross-Chain Liquidity with Safenet Jan. 2025
• 🇫🇷 CTO’z #49 · Grégoire Jeanmart @Multis - “Voyage en pays crypto” Jul. 2022
🗣️ Conferences
• 🇬🇧 SafeCon 2024 · Keystore Introductory Workshop Jun. 2024
• 🇬🇧 DappCon 2022 · Building Within The Safe Ecosystem For A B2B Usecase, Meissner & Jeanmart Sept. 2022
• 🇬🇧 EthCC 2018 · Joshua CASSIDY & Grégoire JEANMART - An introduction to KAURI Q&A Mar. 2018
Articles and Publications
• 🇬🇧 Running an Ethereum Full Node on a RaspberryPi 4 (model B) Feb. 2020
• 🇬🇧 Build your very own self-hosting platform with Raspberry Pi and K3S Apr. 2020
• 🇬🇧 Use Elastic Stack to monitor Kubernetes Oct. 2019
• 🇬🇧 Manage an Ethereum account with Java and Web3j May 2020
• 🇬🇧 Multis integrates TheGraph to offer an even stronger multisig Jul. 2020
• See more on greg.jeanmart.me/blog/
Open-Source projects and contributions
• Rotki extension (Chrome extension, Rotki, Clojure/script, re-frame): The extension connects to Rotki backend API (running locally or remotely) and provides basic insights about your portfolio.
• Mahuta (IPFS, Java, Spring, ElasticSearch): IPFS Storage service with search capability.
• Awesome-state-machine (Java, Spring): State Machine library for Spring-Boot
• Pihole-kubernetes (K8S, Helm)
• Java-ipfs-http-client (Java, IPFS)
• Eventeum (Java, Ethereum, Kafka)
• See more on github.com/gjeanmart
Skills and Technologies
• Technical Skills: Fullstack
• Programming: TypeScript, JavaScript, Java, Clojure, Solidity, Kotlin, PHP, Python
• Frameworks: SpringBoot, NestJS, NextJS, Express, React, Re-Frame, Hardhat, Angular, Tailwind
• Infrastructure: GCP, Firebase, Azure, OracleDB, MySQL, PostgreSQL, MongoDB, ElasticSearch, Kafka, RabbitMQ, Redis, Git, GitHub, Docker, K8S
• Management skills: Project & Budget planning, Agile methodologies, Team leadership & mentoring, Design Thinking