Justin Kook
Senior Software Engineer at MoonPay
New York, New York, United States
Summary
👤
Senior🎓
Top SchoolJustin Kook is a Senior Software Engineer in New York with nine years of experience building full-stack systems at the intersection of blockchain, fintech, and web platforms. Trained in biomedical engineering and applied math, he blends scientific rigor with product-focused engineering—transitioning from medical research and biomechanics tooling to architecting payment systems, MPC wallets, and NFT/DeFi platforms. He’s driven production work at BitPay (multi-coin wallets, segwit, Web3 integrations) and contributed back-end and front-end code to prominent open-source Bitcoin projects like bitcore and BitPay Wallet. As a founder and CTO he launched event-economy tooling, and as an engineer he shipped high-accuracy automated license and royalty systems, scaling to tens of thousands of users on blockchain marketplaces. Currently at MoonPay, he focuses on scalable crypto infrastructure and has a particular interest in blockchain scalability and oracle/DeFi primitives. His background in lab automation and data-driven research gives him an uncommon knack for reliable, measurable system design.
9 years of coding experience
9 years of employment as a software developer
Full Stack Development Bootcamp, Full Stack Development Bootcamp at Georgia Institute of Technology
English, Korean, Spanish, Japanese, Portuguese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (22)
transaction10
javascript10
typescript10
bitcoin10
user-interface10
bitcoins10
sc10
transactionscope10
ionic-framework10
scs10
blockchain10
typescript-types10
html10
nodejs10
typescripts10
Programming languages (5)
Github contributions (5)
bitpay/bitcore
Jan 2019 - Aug 2020
A full stack for bitcoin and blockchain-based applications
Role in this project:
Back-end Developer
Back-end DeveloperContributions:260 commits, 130 PRs, 131 comments in 1 year 7 months
Contributions summary:Justin's commits focus on implementing features and modifying the back-end of the `bitcore/bitcore` repository, which is described as a full stack for bitcoin and blockchain-based applications. They've made changes to the `packages/bitcore-node` and `packages/bitcore-client` directories, indicating work on the core node and client-side functionality. These changes involve database interactions, transaction handling, and the addition of RPC methods, all contributing to the back-end systems.
full-stackcryptocurrencyblockchainbitcoin
bitpay/wallet
Apr 2019 - Aug 2020
Bitpay Wallet (formerly Copay) is a secure Bitcoin and other crypto currencies wallet platform for both desktop and mobile devices.
Role in this project:Front-end Developer
Front-end DeveloperContributions:2 reviews, 194 commits, 151 PRs in 1 year 4 months
Contributions summary:Justin primarily worked on implementing and refining the user interface for the Bitpay Wallet, specifically within the gift card features. Their commits introduced new UI pages like the ConfirmInvoicePage, along with associated HTML, SCSS, and TypeScript code. They focused on integrating the UI with the gift card provider and integrating payment request interfaces for the gift card features.
currencieswalletsegwitcrypto-currenciessecure
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