J Rossy
Freelance Software Engineer at Self-employed
Ontario, Canada
Summary
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Rockstar🎓
Top SchoolJ Rossy is a freelance software engineer with 11 years of experience building full-stack web and blockchain applications, focused on the intersection of development, design, and finance. A University of Waterloo alum, he has led engineering efforts at cLabs on the Celo ecosystem and shipped production wallets, governance, and staking DApps as an independent builder. His work spans front-end design, backend services, developer tooling, and SDK/infrastructure contributions — notably improving TypeScript linting and Ethers.js integrations for the Hyperlane monorepo. Comfortable in both product and technical leadership roles, he’s built foundational pieces for projects like Valora, Uniswap.org’s mobile wallet, and Mento.finance. Based in Ontario and active in the Ethereum/DeFi space, he blends product instincts with hands-on coding and a knack for clear developer experience.
11 years of coding experience
7 years of employment as a software developer
Bachelors, Software Engineering w International Studies option, Bachelors, Software Engineering w International Studies option at University of Waterloo
Stackoverflow
973reputation
398kreached
5answers
1question
firebase
top-5%
google-cloud-functions
top-5%
Github Skills (23)
typescript10
sdk10
blockchain10
typescript-types10
monorepo10
typescripts10
google-cloud-functions9
interchain9
nodejs9
firebase9
hardhat8
javascript8
cicd7
ethereum7
html6
Programming languages (13)
Github contributions (5)
hyperlane-xyz/hyperlane-monorepo
May 2022 - Jan 2023
The home for Hyperlane core contracts, sdk packages, and other infrastructure
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:22 releases, 1206 reviews, 62 commits in 8 months
Contributions summary:J primarily focused on the codebase's infrastructure and SDK packages. They set up and configured linting tools for TypeScript assets, improving code quality. The user updated and refactored Ethers.JS dependencies and refactored a Hello World app to demonstrate the Hyperlane SDK. Significant changes were made to the codebase by merging SDK, Hardhat and Deploy packages.
interchainmonorepohyperlaneethereumblockchain
mento-protocol/mento-web
Sep 2021 - Feb 2023
A simple DApp for Celo Mento exchanges
Contributions:5 releases, 26 reviews, 140 commits in 1 year 4 months
exchangedappethereumceloweb3
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