Junichi Sugiura
Software Engineer at Mistral AI
Paris, Ile-de-France
Summary
🤩
Rockstar🎓
Top SchoolJunichi Sugiura is a front-end focused full-stack engineer with 10 years’ experience building production-grade interfaces and platform integrations, now working at Mistral AI in Paris. He specializes in React, TypeScript and Rust, and has led large migrations (Flow to TypeScript) and mobile platformization efforts at Ledger, improving type safety and E2E testing across mono-repos. At Cartridge he shipped game-focused onchain tooling—wallets, explorers, and CLIs—bridging Web2 UX with smart-contract ecosystems and authoring diptools as an OSS maintainer. Comfortable navigating large legacy codebases, he moves proof-of-concepts into scalable products and standardizes design systems using tools like Tailwind, Storybook and snapshot testing. A rapid learner and active open-source contributor, he has hands-on experience integrating complex crypto flows (swap, countervalues, Cosmos delegations) and building white-label, high-reliability front-ends for crypto-native experiences.
10 years of coding experience
9 years of employment as a software developer
Computer Science, Computer Science at Canisius College
English, Japanese
Github Skills (41)
javascript10
react-native10
mobile-development10
electron10
typescript10
bitcoin10
cosmos10
user-interface10
bitcoins10
cryptocurrency10
uid10
front-end-development10
typescript-types10
error-handling10
typescripts10
Programming languages (10)
Github contributions (5)
LedgerHQ/ledger-live-mobile
Nov 2020 - May 2022
⛔️ DEPRECATED - Ledger Live (Mobile)
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:46 reviews, 129 commits, 76 PRs in 1 year 6 months
Contributions summary:Junichi primarily focused on integrating a new CounterValues API within the Ledger Live Mobile application. This involved upgrading dependencies, setting up and configuring the CounterValues provider, and adopting related components. The user refactored existing countervalue logic, including removing obsolete code, and updated various UI elements such as AmountInput, refresh controls, and portfolio-related components. The user also performed bug fixes and implemented various code improvements.
react-nativebluetoothblockchainwalletcryptocurrency
LedgerHQ/ledger-live-common
Mar 2020 - May 2022
⛔️ DEPRECATED - Common ground for the Ledger Wallet apps
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:26 reviews, 214 commits, 30 PRs in 2 years 2 months
Contributions summary:Junichi primarily contributed to the Cosmos-related features within the Ledger Live common library. They implemented functionality for formatted Cosmos delegations, including the ability to claim rewards and manage redelegations/undelegations. Furthermore, the user added a query selector for Cosmos delegations, facilitating filtering and selection within the application. Their work involved modifications to both the react components and associated types files.
ethereumblockchainwalletcryptocurrencyledger
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