Hello! I’m Henry Lee, a blockchain and full-stack developer based in Waterloo, Ontario, Canada. I bring 5 years of experience building secure, scalable, and high-performance decentralized applications using MERN, React, Web3.js, and Node.js, with backend work on MongoDB and PostgreSQL. I’ve led end-to-end initiatives, including spearheading a $750k software project as a senior engineer in a 12-person team, designing reusable components used across multiple projects, and significantly reducing development effort. I’ve migrated automation into commercial software, improved query efficiency by up to 59%, cut deployment costs, and even built a chatbot that helped reduce customer service costs by 240%. I enjoy turning complex problems into practical solutions on Ethereum and Binance Smart Chain with ERC standards.…

Henry Lee

Hello! I’m Henry Lee, a blockchain and full-stack developer based in Waterloo, Ontario, Canada. I bring 5 years of experience building secure, scalable, and high-performance decentralized applications using MERN, React, Web3.js, and Node.js, with backend work on MongoDB and PostgreSQL. I’ve led end-to-end initiatives, including spearheading a $750k software project as a senior engineer in a 12-person team, designing reusable components used across multiple projects, and significantly reducing development effort. I’ve migrated automation into commercial software, improved query efficiency by up to 59%, cut deployment costs, and even built a chatbot that helped reduce customer service costs by 240%. I enjoy turning complex problems into practical solutions on Ethereum and Binance Smart Chain with ERC standards.…

Available to hire

Hello! I’m Henry Lee, a blockchain and full-stack developer based in Waterloo, Ontario, Canada. I bring 5 years of experience building secure, scalable, and high-performance decentralized applications using MERN, React, Web3.js, and Node.js, with backend work on MongoDB and PostgreSQL.

I’ve led end-to-end initiatives, including spearheading a $750k software project as a senior engineer in a 12-person team, designing reusable components used across multiple projects, and significantly reducing development effort. I’ve migrated automation into commercial software, improved query efficiency by up to 59%, cut deployment costs, and even built a chatbot that helped reduce customer service costs by 240%. I enjoy turning complex problems into practical solutions on Ethereum and Binance Smart Chain with ERC standards.

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Skills

Experience Level

JavaScript
Expert
CSS
Expert
GitHub
Expert
TypeScript
Expert
MongoDB
Expert
AWS
Expert
Laravel
Expert
Docker
Expert
Ethereum
Intermediate
MySQL
Intermediate
Ruby on Rails
Intermediate
Solidity
Intermediate
Kubernetes
Intermediate
PHP
Intermediate
PostgreSQL
Intermediate
Python
Intermediate
SQL
Intermediate
Django
Intermediate
WordPress
Intermediate
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Language

English
Fluent

Work Experience

Senior Full Stack & Blockchain Developer at OpenText
January 1, 2021 - Present
Developed and deployed smart contracts on Ethereum and Binance Smart Chain, focusing on ERC standards. Moved the automation solution into commercial software. Designed and developed reusable software components used in four projects, reducing development effort by 40%. Re-engineered critical modules with a centralized library to optimize performance by 59%. Awarded top performer ratings across years.
Freelance Full-Stack Developer at Self-Employed / Freelancer
January 20, 2025 - Present
Built full-stack decentralized applications with user interfaces using React, Web3.js, and Node.js. Developed backend systems with MongoDB and PostgreSQL. Created RESTful APIs to interface with smart contracts and blockchain networks. Delivered reusable software components, contributing to a 40% reduction in development effort.
Freelance Full Stack & Blockchain Developer at Freelancer
January 20, 2025 - Present
Built full-stack decentralized applications with user interfaces using React, Web3.js, and Node.js. Developed backend systems to interact with databases like MongoDB and PostgreSQL. API development: created RESTful APIs to interface with smart contracts and blockchain networks.
Senior Full Stack & Blockchain Developer at OpenText
January 1, 2021 - Present
Developed and deployed smart contracts on Ethereum and Binance Smart Chain, focusing on ERC standards. Moved automation solutions into a commercial software product by designing and developing reusable software components used across four projects, reducing development effort by 40%. Re-engineered critical modules to rely on a centralized library to optimize performance by 59%. Coordinated a year-long release of a six-part platform project.

Education

Software Licensing and Distribution at Kenfil Hong Kong
January 11, 2030 - January 1, 2009
at University of Waterloo
January 11, 2030 - January 1, 2013
Bachelor of Mathematics at University of Waterloo
January 1, 2009 - January 1, 2013

Qualifications

Gold Medalist
January 11, 2030 - October 5, 2025
CSR Volunteer
January 11, 2030 - October 5, 2025

Industry Experience

Software & Internet, Professional Services, Media & Entertainment, Computers & Electronics
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