Chris Yuen, Developer in Hong Kong, Hong Kong
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Chris Yuen

Verified Expert  in Engineering

Software Developer

Hong Kong, Hong Kong
Toptal Member Since
October 5, 2016

Chris is an experienced full-stack entrepreneur who has built a variety of applications over the years: from the back-end to front-end, from disassembly to machine learning. He is passionate about staying on the forefront of technology and leveraging his experience to bring projects to a great level of success.


JavaScript, Python, Objective-C, Swift, Java, Ruby on Rails (RoR), Ruby
R, Ruby on Rails (RoR), Ruby
ASP.NET, C++, C#




Preferred Environment

Git, Vi, MacOS

The most amazing...

...thing i've implemened is a native Word (.docx) file renderer with industrial grade fidelity and performance.

Work Experience

Chief Technology Officer

2014 - PRESENT
  • Created from the ground up an O2O (online-to-offline) application that has obtained 1 million+ users worldwide. I was involved in the development of the mobile apps and back-end server.
  • Scaled and optimized the service architecture to be able to support tens of thousands of transactions per day.
  • Created and managed the development workflow for the whole company's technical teams.
Technologies: JavaScript, Python, Objective-C, Swift, Java, Ruby on Rails (RoR), Ruby

Analytical Engineer

2012 - 2014
  • Designed and developed decision support framework for financial institutions. It leverages cutting-edge machine learning and big data technologies.
  • Managed the server cluster to enable the infrastructure to perform more than a million real-time transactions per day. The AWS powered platform was runner-up in Amazon AWS Global Start-Up Challenge 2012.
  • Tailored proof-of-concept demonstrations and reports to individual clients.
Technologies: R, Ruby on Rails (RoR), Ruby

Analyst Programmer

2010 - 2012
  • Developed, maintained a HTML to PDF library (C++ and .NET). This product set a new standard in the industry in terms of quality and quantity of features.
  • Solely created a fast and accurate Microsoft Office document renderer. This product opened a new market for the company.
  • Created a robust multi-process library for out of process code execution in .NET.
  • Pioneered a streamlined building infrastructure and fully automated testing framework. Also built the supporting tools and implemented the process.
Technologies: ASP.NET, C++, C#


This is a high performance and high fidelity PDF library for .NET. It does HTML to PDF conversion.

DemsytData is a platform to help organizations unlock financial services through the use of better data, smarter decisions, and best in class infrastructure.


GoGoVan is the first and most popular logistics booking mobile app in Hong Kong. In less than one year, we built the largest logistic fleet in Hong Kong, which including 18,000+ cargo vans and trucks.

Since then, GoGoVan has expanded operations to 6 countries and attained 1 million+ users in the Southeast Asia region.


React, jQuery, ABCpdf


Eclipse IDE, Vim Text Editor, Microsoft Visual Studio, Jenkins, Git, IntelliJ IDEA


Ruby on Rails (RoR), Hadoop, Apache Spark, ASP.NET, React Native, Sinatra, Express.js, Django, AngularJS, Hapi.js


JavaScript, HTML5, Lua, Swift, Objective-C, C++, Haskell, C#, OCaml, Python, Ruby, Java, PHP, Erlang, Scala, F#, Clojure, Assembly, R, Go, Rust


Scrum, Agile, Functional Programming


Amazon Web Services (AWS), Windows, Linux, Android, iOS, Docker, MacOS, Kubernetes, Arduino


MySQL, Cassandra, PostgreSQL, MongoDB, Microsoft SQL Server


Freelancing, Software Development, Vi

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