Éric Lamontagne, Developer in Montreal, QC, Canada
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Éric Lamontagne

Verified Expert  in Engineering

Blockchain Developer

Montreal, QC, Canada
Toptal Member Since
August 2, 2022

Éric has 23 years of software development experience since obtaining his bachelor's degree in software engineering. He has created a software development consultancy, founded a startup, and published mobile apps in Apple's App Store. He is certified in blockchain and is a Microsoft Certified Solution Developer (MCSD). Éric has worked with organizations of all sizes, from successful startups to corporations in the transportation, media, energy, aeronautics, insurance, and financial sectors.


National Bank of Canada
React Native, TypeScript, Web3.js, Solidity, Smart Contracts, Node.js, CSS
Solidity, React, React Native, Flutter, Web3.js, Ethers.js, Git...
Blockchain, Mobile, Web, CSS




Preferred Environment

JavaScript, Solidity, React, React Native, Git, Web3.js, Ethers.js, Hardhat, Smart Contracts, Truffle

The most amazing...

...thing I've contributed was to MetaMask at Consensys, driving innovation in blockchain and smart contract technologies.

Work Experience

Senior Mobile Developer

2020 - 2022
National Bank of Canada
  • Developed the new version of the National bank's banking application with React native.
  • Oversaw releases to the app store and researched and implemented OWASP security best practices.
  • Planned development, code, and unit-test new features.
Technologies: React Native, TypeScript, Web3.js, Solidity, Smart Contracts, Node.js, CSS

Blockchain Mobile and Web Developer

2017 - 2022
  • Developed a social media mobile app where users can tip the content creator using crypto.
  • Built a cryptographically secure Node.js library to request QR codes granting access to high-security buildings. I used React and React Native for the mobile and web apps and then used my secure library to get QR codes, allowing them to gain access.
  • Researched and developed a proof-of-concept to use NFT images as background for Apple Watch.
  • Developed and published a mobile app called Captain's Numbers.
Technologies: Solidity, React, React Native, Flutter, Web3.js, Ethers.js, Git, Non-fungible Tokens (NFT), Ethereum, Node.js, CSS

Software Developer

1999 - 2022
  • Developed a suite of new applications and user-facing functionalities for a banking and financial business. Created reusable libraries and web components to reduce further development costs.
  • Collaborated with back-end developers and web designers to improve usability. Optimized an application for maximum speed and scalability. Worked closely with UX, analysts, and back-end developers to optimize existing web technologies.
  • Facilitated using technologies like Angular 4, NGRX, Webpack, SCSS, and more. Developed a next-generation web application for a well-known American health care provider.
Technologies: Blockchain, Mobile, Web, CSS

Captain's Numbers Mobile Application

Captain's Numbers allows pilots to log their flights and expenses. It is available on App Store.

The app also allows the creation of financial reports typically expected from aircraft owners that must be submitted to the accountant at the end of the fiscal year.

Mobile Application for Canada's National Bank

The National Bank's mobile app allows users to manage their personal bank accounts, for example, depositing checks, paying bills, transferring money locally or internally, and more.

It is available on the Apple App store and Google Play store

GitHub Portfolio: Smart Contracts, Decentralized Finance, Blockchain, Web3 dApp

I have over 25 blockchain projects completed in this portfolio. The first 20 projects are Web3 Solidity dApp projects: decentralized finance dApps, social media dApps, Web3 game dApps, and NFT marketplace dApps. I also coded two core blockchain projects where I developed Ethereum from scratch using plain JavaScript. I did the same for the Bitcoin blockchain. Unit tests cover all.

For each of these projects, you can see the quality of my work, as each code commit is written and commented on by me.
1997 - 2003

Bachelor's Degree in Software Engineering

University of Quebec at Chicoutimi - Chicoutimi, Quebec, Canada


Advanced Smart Contracts

Block Geeks


Advanced Blockchain Concepts

Block Geeks


Microsoft Certified Solution Developer (MCSD)



React, Web3.js, OpenZeppelin, Node.js


Git, Ganache


JavaScript, TypeScript, Solidity, CSS


Web, Mobile, iOS, Blockchain, Ethereum


Unit Testing, Microservices


Azure Cloud Services


React Native, Flutter, Hardhat, .NET, Truffle


Software Development, Smart Contracts, Ethers.js, Cryptoeconomics, Non-fungible Tokens (NFT)

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