Jonathan Giamporcaro

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Core DeFi Smart-Contract Engineer

Feb 2025 - Current (1 year 9 months)

Core maintainer designing, implementing and securing Stake DAO’s on-chain vaults, lockers, gauges, yield + oracle integrations.

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Co-Founder

PUSH20 Labs

Feb 2025 - Current (1 year 9 months)

PUSH20 Labs designs, builds and secures high-value DeFi protocols (vaults, lockers, oracles, complex integrations). Deep EVM expertise (Solidity/Vyper, ERC-4626/5115/7540, AA), gas & security driven—from architecture to mainnet delivery.

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Technical Co-Founder & CEO

Smoo.th

Feb 2024 - Feb 2025 (1 year 1 month)

Smoo.th is the ultimate payment solution for digital assets, inspired by PayPal and Apple Pay. By leveraging passkeys and account abstraction, we deliver seamless 1-click onboarding for users, offering a secure, multi-device experience. For developers, Smoo.th is a plug-and-play solution fully compatible with all modern frameworks, making integration effortless and intuitive. As the CEO and Product Engineer, I was deeply involved in every aspect of Smoo.th’s vision, design, and exe

Lead Solidity Instructor

Ledger

Jan 2023 - May 2023 (5 months)

Driven by a genuine passion for blockchain technology, I developed and led a hands-on, project-based course on Solidity and Ethereum for 13 engineers at Ledger. Starting from the ground up, I crafted an immersive curriculum that transformed the team from beginners into proficient smart contract developers capable of creating, deploying, and maintaining contracts on the Ethereum Virtual Machine (EVM). The course spanned nearly 20 in-depth chapters, each designed to balance theory with intensive coding practice. Engineers tackled real-world simulations and complex puzzles, sharpening their skills in gas optimization and building confidence in Solidity. The program culminated in a rigorous, six-hour final project that tested their ability to a

Blockchain R&D engineer | Innovation Labs

Ledger

Feb 2022 - Feb 2024 (2 years 1 month)

As part of Ledger’s Innovation Team, I played a pivotal role in developing next-generation blockchain solutions to enhance user security, scalability, and usability. My primary focus was Ledger Fresh, a flagship innovation project designed to redefine wallet interactions and onboarding by combining uncompromising security with modern usability. Key Contributions: - Account Abstraction (AA) Researched and implemented account abstraction principles to enable wallets to operate as smart contracts, providing dynamic, customizable logic. Designed security profiles for daily and high-stakes transactions. - WebAuthn Integration Pioneered WebAuthn-based passwordless authentication, enabling seamless device registration and user flows. Addressed ver

Software Engineer

Ledger

Jul 2021 - Feb 2022 (8 months)

As a Software Engineer at Ledger, I contributed to the development and maintenance of Ledger Live, the company’s flagship wallet application for mobile and desktop platforms. My work focused on delivering new features, optimizing performance, and ensuring a seamless user experience. Key Contributions: Feature Development: - Implemented Ethereum Name Service (ENS) support, enabling users to interact with human-readable wallet addresses. - Led the rework of the swap functionality, improving usability and scalability. - Delivered various performance optimizations to enhance app responsiveness and reliability. Quality Assurance: - Established end-to-end (e2e) testing frameworks to improve product quality and streamline the release process. Main

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Lead Product-Focused Engineer

Aug 2020 - Jul 2021 (1 year)

👁 Front-End Development Built dynamic web applications with TypeScript, JavaScript, React, Next.js, and GraphQL. Implemented SSR, SSG, and incremental SSG for performance and scalability, using Gatsby, Storybook, and Chromatic for component-driven development. 🎨 UI/UX & Design Systems Partnered with design teams to build a cohesive design system, ensuring UI consistency across products. Skilled in CSS Modules and Figma for scalable design integration. 🔍 Testing & Quality Assurance Championed quality standards with Jest, React Testing Library, Cypress, ESLint, and Prettier, ensuring robust testing and code quality across the team. 💪 Team Collaboration & Leadership Managed and mentored the dev team, optimized Git workflows, and contribute

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Lead Product-Focused Software Engineer

Aug 2019 - Aug 2020 (1 year 1 month)

👁 Front-End Development Led the development of interactive, scalable web applications using JavaScript, React, Next.js, Vue.js, and GraphQL (Apollo). Utilized advanced tooling like Webpack, Babel, and Material UI for optimized and responsive user interfaces. 🎨 UI/UX Design & Systems Collaborated with designers to create and implement a cohesive design system, unifying product aesthetics and enhancing user experience across our primary and side products. Skilled in CSS, JSS, and UI frameworks to ensure seamless, consistent design. 🔍 Testing & Quality Assurance Focused on code quality with robust testing and linting practices using Jest, Enzyme, ESLint, Pytest, Black, and Flake8. Established CI/CD practices with web accessibility and perfo

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Product-Focused Software Engineer

Aug 2018 - Aug 2019 (1 year 1 month)

👁 Front-End Development Developed modern web applications with JavaScript, React, Next.js, and GraphQL (Apollo), leveraging CSS-in-JS for component styling and optimizing builds with Babel and Webpack. 🎨 UI/UX Design & Testing Enhanced user experience through UI/UX design, from conceptualization (personas, wireframes, mockups) to validation. Built and maintained a design system for product consistency, conducted user tests, and ensured quality with Jest, Enzyme, ESLint, and Prettier. 💪 Collaboration Coordinated with internal and remote teams (French, Ukrainian, Polish, Vietnamese) via Git, Jira, Confluence, and design platforms like Sketch, InVision, and Sketch Cloud. Created and documented a Gitflow process to streamline development. 🔬

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E-sport Manager & Coach

Yo Gaming

Nov 2017 - Apr 2018 (6 months)

Managed and coached a competitive Fortnite team, Yo Gaming, to enhance team performance and cohesion. 🤝 Team Management - Established collaborative tools to streamline communication and post-training debriefs. - Planned team-building sessions and prepared players for real-life events, including tournaments. - Provided ongoing support to players, fostering a positive and focused environment. 💪 Coaching - Developed winning strategies in collaboration with players and conducted detailed training debriefs. - Focused on mental coaching to help players reach their peak performance and maintain resilience under pressure. Show less

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Co-founder & Full-stack Engineer

Oct 2017 - Oct 2018 (1 year 1 month)

Yo News is your personal news assistant, delivering daily updates on your favorite topics directly through Messenger ➡️ m.me/YoNewsOfficiel. 🎒 Founder Led product strategy, marketing, and communication initiatives, focusing on a product-first, agile approach. Experienced in pitching and engaging with the startup ecosystem. 🤖 Full-stack Development Developed and maintained the platform using React, Node, Express, and Google Cloud with a NoSQL database, ensuring a seamless user experience. 🥂 Networking & Community Active participant in entrepreneurial networks, including IE Club, Strasbourg Startup, Alsace Digitale, and Startup Weekend. Show

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Front-End Developer (Web & Mobile)

WhiteQuest

Sep 2017 - Oct 2017 (2 months)

Web & Mobile Front-End Development Developed and maintained full-stack applications for web and mobile platforms, focusing on creating seamless, responsive user interfaces with React.js for the web and React Native for mobile. 🌐 Development Skilled in building scalable applications with React.js, Node.js, Express.js, and React Native, ensuring high performance and user-centric design. 🗿 Workflow & Tools Optimized workflow and code quality with tools like Git, ESLint, Babel, Webpack, and Flowtype. Collaborated effectively within the team using Git and Slack to maintain clear communication and streamlined development. Show less

Frontend Engineer

Freelance Web Development

Jul 2017 - Mar 2019 (1 year 9 months)

Strategic Planning & Solution Design: I collaborate with you from the concept phase, helping to define your project’s needs and identify the most effective technical solutions to achieve your goals. Custom Development: I develop your project from the ground up, crafting high-quality, scalable front-end applications tailored to your specifications. Reliable Hosting & Support: I handle all aspects of hosting and ensure your application runs smoothly and securely, allowing you to focus on your business. Ready to elevate your project? Let’s discuss how I can help make your ideas a reality. Don’t hesitate to reach out! Show less

Full-Stack Web Developer

Groupe Crédit Agricole

Sep 2016 - Aug 2017 (1 year)

🚲 Front-End Development Developed responsive web and mobile applications with JavaScript, React, Webpack, Babel, and ESLint, ensuring a consistent and engaging user experience. 🚢 Back-End Development Built and maintained back-end services with Node.js, RESTful APIs, and LAMP stack (Linux, Apache, MySQL, PHP), integrating efficient data management with MySQL and secure API requests via cURL. 🖌️ Web & Email Development Created and optimized web and email content for internal and external communications. 🗂️ Project Management Oversaw and managed web-related side projects, ensuring they aligned with organizational goals and timelines. 🎤 Internal Speaker Led discussions and presentations in internal meetings, sharing insights and updates on

Jonathan Giamporcaro

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Jonathan Giamporcaro

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