Xenor Chang, Developer in Taipei, Taiwan
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Xenor Chang

Verified Expert  in Engineering

Turbolinks Developer

Taipei, Taiwan
Toptal Member Since
September 30, 2019

Xenor is an experienced full-stack web and software developer with expertise in Ruby, Ruby on Rails, JavaScript, and HTML5/CSS.


Listia Inc.
Ethereum, Ruby on Rails (RoR), Ruby
Listia Inc.
Ethereum, CSS3, HTML5, JavaScript, Ruby on Rails (RoR), Ruby
Listia Inc.
CSS3, HTML5, JavaScript, Ruby on Rails (RoR), Ruby




Preferred Environment

Atom, Git, MacOS

The most amazing...

...thing I've coded is a delayed job framework combining relational database and non-relational database.

Work Experience

Independent Contractor

2019 - PRESENT
Listia Inc.
  • Solved web application issues and blockchain-related problems.
Technologies: Ethereum, Ruby on Rails (RoR), Ruby

Lead Developer

2015 - 2019
Listia Inc.
  • Migrated behavior-based vanilla JavaScript to ReactJS components.
  • Migrated Rails from 3 to 4, and using Rails 5 for new projects.
  • Maintained and wrote Ethereum Smart Contracts using Solidity.
  • Maintained and evolved an Ethereum blockchain processor framework built with CTO.
  • Managed a team of 4, being a bridge that communicates between US and TW team, pass down project specs and make critical technical decisions with CTO.
Technologies: Ethereum, CSS3, HTML5, JavaScript, Ruby on Rails (RoR), Ruby

Web Developer

2013 - 2015
Listia Inc.
  • Built API back-end for Listia mobile clients.
  • Built delayed job framework that combines SQL and NoSQL job serialization/deserialization, enqueue, and error handling.
  • Built a cron job framework with CLI that can securely run jobs with monitoring and reporting tools.
Technologies: CSS3, HTML5, JavaScript, Ruby on Rails (RoR), Ruby

Web Developer

2012 - 2013
Code Green IT
  • Worked on a golf handicap registration system using Rails 3.
Technologies: Ruby on Rails (RoR), Ruby

IT Manager

2011 - 2012
Winjet Co
  • Maintained and built a B2C EC platform combining front store and ERP management.
Technologies: C#, .NET, Symfony


An online free trading marketplace combined with ERC-20 XNK token.


Seller reputation and payment system built on top of Ethereum blockchain.
2002 - 2006

Bachelor's Degree in Psychology

National Chengchi University - Taipei, Taiwan


Twitter API


RSpec, Amazon Simple Queue Service (SQS), Amazon Simple Email Service (SES), Git, Atom


Ruby on Rails (RoR), Stimulus, Symfony, .NET, Jasmine, Symfony 2


MySQL, Redis, SQLite, MongoDB


Ruby, JavaScript, TypeScript, CSS3, HTML5, CoffeeScript, C#, PHP 7


Agile Software Development


AWS Elastic Beanstalk, MacOS, Ethereum, Android, iOS


Turbolinks, Amazon Route 53

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