David Mihal, Developer in Boston, United States
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David Mihal

Verified Expert  in Engineering

Chrome Extensions Developer

Boston, United States
Toptal Member Since
January 8, 2017

David has been developing websites and web applications for all of his adult life. As a software engineer, he's worked for many diverse software companies from early-stage startups to Google. David is experienced with many web frameworks and environments, but he particularly enjoys developing with Meteor.js. He appreciates the importance of quality code as well as the need to meet scheduling demands.


Parity Polkadot, Ethereum
Minuteman Capital
React, Meteor, Web3.js, Truffle, Solidity, Blockchain, Ethereum
Zen Labs
Chrome Extensions, React




Preferred Environment

Git, Sublime Text, MacOS

The most amazing...

...project I've worked on was an infobox that appeared in Google Search results.

Work Experience

Blockchain Engineer

2018 - PRESENT
  • Development of Parity sidechain networks.
Technologies: Parity Polkadot, Ethereum

Software Engineer

2018 - PRESENT
Minuteman Capital
  • Developed an Ethereum ERC20 token contract as well as smart contracts for democratic voting by token holders.
  • Built the back-end server for monitoring Ethereum contracts and creating transactions.
  • Developed a Meteor/React web app (DApp) for holding tokens and voting on proposals.
Technologies: React, Meteor, Web3.js, Truffle, Solidity, Blockchain, Ethereum

Software Engineer

2017 - 2017
Zen Labs
  • Built a Google Chrome extension for monitoring and blocking browsing activity.
Technologies: Chrome Extensions, React

Software Engineer

2017 - 2017
  • Updated and maintained an existing Meteor/React application.
  • Built an animated landing page using React/Next.js.
Technologies: Next.js, Node.js, React, Meteor

Software Engineer

2015 - 2016
  • Worked on the civics team to display primary election result information in Google Search.
  • Added text-to-speech responses to civic-related queries in Google Search.
Technologies: Protocol Buffers, Java, Google Closure, JavaScript

Software Engineering Intern

2014 - 2014
  • Developed a Chrome extension and a Google app engine back-end. Managed the transactional email system for the product and was responsible for maintaining it and ensuring its success.
  • Built and maintained a transactional email system for the product.
Technologies: Google App Engine, Python, Backbone.js, JavaScript

Software Engineering Intern

2013 - 2013
Rakuten Loyalty
  • Developed multiple Node.js web services.
  • Built browser extensions for multiple browsers.
Technologies: Node.js

Software Engineering Intern

2012 - 2012
Constant Contact
  • Maintained a large web application using the Java and Spring Framework.
Technologies: Spring, Java

Piñata Overlay

Pinata Overlay is a system consisting of a smart contract and IPFS oracles that allows for decentralized funding of IPFS storage.

It was the winning project at ETH Berlin 2018.


A JavaScript polyfill designed to extend the capabilities of Google Chrome and other browsers that support web workers but lack subworkers. This polyfill effectively implements the desired functionality by creating all subworkers within the main page's context and simulating communication.

Gas Guzzler

A web app for comparing the amount of Ether consumed by various Solidity code blocks; it's useful for building efficient Ethereum smart contracts. The app uses web workers to compile and execute the Solidity code in the browser all without requiring a back-end server.
2011 - 2015

Bachelor’s Degree in Computer Science

Worcester Polytechnic Institute - Worcester, MA, USA


Web3.js, jQuery, React, Node.js, Google Closure, Backbone.js


IntelliJ IDEA, Sublime Text, Git, Docker Compose


Meteor, Ethereum, MacOS, Google App Engine, DigitalOcean, Docker, Blockchain


Redux, Bootstrap, Spring, Next.js, Truffle, Parity Polkadot, Express.js


JavaScript, Solidity, Python, SQL, Java, C#


MySQL, MongoDB


Test-driven Development (TDD)


Chrome Extensions, Software Development, Front-end Development, DApps, Ethereum Smart Contracts, Protocol Buffers, Networks

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