William Wang, Developer in Kunming, Yunnan, China
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William Wang

Verified Expert  in Engineering

Software Developer

Kunming, Yunnan, China
Toptal Member Since
December 12, 2016

William is a full-stack developer who has worked as a freelancer, senior developer, and CTO for local IT companies. He's developed and completed many web and mobile projects. He mainly uses PHP and MySQL for the back end and jQuery or React for the front end. William is a passionate learner who picks up things quickly, loves coding, and truly enjoys the perks of freelancing.


Shiftsmart Inc.
React, React Native, MobX, Node.js, Socket.IO
Gezher Technology
Node.js, React Native, React, Laravel, MySQL, PHP
3Rong Technology
Front-end, Laravel, MySQL, PHP




Preferred Environment

Git, ECMAScript (ES6), Laravel, PHP, Linux, MacOS, Visual Studio Code (VS Code), React, React Native

The most amazing...

...project I've developed was an advertisement distribution platform for a one-man company that helped him earn over $100,000 per month.

Work Experience

React Native Developer

2017 - 2021
Shiftsmart Inc.
  • Developed the initial version of our employer app based on React Native and MobX and incorporated features, fixed bugs, and optimized the app for four years. The company has two main apps, one for the worker and one for the employer.
  • Refined and optimized our worker app, a React Native app, added features, resolved bugs, maintained webpack configurations, and more.
  • Boosted our main web platform system using Jira as a task tracking tool, created features, eliminated bugs, improved optimization, sustained SSR and CSR configurations, etc.
  • Built a React Native form generator library. It uses JSON as a form schema definer and automatically generates the form interface, client-side validation, and form submission logic.
Technologies: React, React Native, MobX, Node.js, Socket.IO

Co-founder and CTO

2015 - 2016
Gezher Technology
  • Co-founded this company whose chief product is farm management software and managed the business's technical aspect.
  • Established a reliable and flexible working process for the product and technical team.
  • Collaborated with the product manager to design the product prototype and make all product decisions.
  • Managed the developer team to build the product, its maintenance, and iterations.
Technologies: Node.js, React Native, React, Laravel, MySQL, PHP

Senior Developer and CTO

2013 - 2015
3Rong Technology
  • Created a wedding hotel booking website that became the top hotel booking website for the local area.
  • Developed a CRM system for sales to manage their client.
  • Built a car rental platform including a website, mobile website, and mobile app for both users and merchants, including a WeChat micro-site.
  • Architected a P2P investment website, mobile site, and mobile app.
  • Created the company's internal process: product design, code architecture, coding, testing, and deployment.
Technologies: Front-end, Laravel, MySQL, PHP

Freelance Web Developer

2007 - 2013
Freelance Work
  • Finished hundreds of projects, including many web and mobile projects. Received some very good testimonials from my customers and established a long-term relationship with some of them.
  • Built many WordPress sites, including many custom-developed themes and plugins.
  • Developed many web and mobile projects, mainly PHP and MySQL projects.
  • Integrated APIs like the PayPal payment gateway API, Google Maps API, OAuth API, social media APIs, and others for many client sites.
  • Worked remotely on many long-term projects, building and maintaining them, using SSH login and automatic deploy script to manage the code and server.
Technologies: CSS, HTML, JavaScript, MySQL, PHP

FutureFarm App

FutureFarm is a platform that enables you to manage your farm in a new way. This app will help you manage all aspects of your farm and integrate other data sources into it, including weather, soil, and more.

FutureFarm has two parts: an app and website.

The app is built on React Native technology and uses MobX to manage the state. The web part is based on Laravel and uses React for the front end.

Advertisment Distribution System

This is a platform that distributes advertisements onto many affiliates sites. It can custom-design the lead capture form and define delivery methods for different types (regular HTTP, REST, SOAP, web services, and more). I built this system in its entirety.

Note Anywhere Chrome Extension

This Chrome extension enables the user to make notes on any web page, with a summary page to show all the notes and many custom settings. I built this Chrome extension in just a weekend.

HasLockers Content Locking System

A cloud-based tool for web admins to lock their web page content and maximize their content CPA campaign income. The user can customize the pop-up interface in a WYSIWYG way.

Node.js and Markdown-based Blog

A simple Node.js and Markdown-based blog that I made for my own personal use.


HTML5, CSS3, ECMAScript (ES6), JavaScript, PHP, SCSS, SQL, Less, TypeScript, HTML, CSS, Python, Ruby, GraphQL, Markdown


React Native, Lumen, Laravel, Slim, PHPUnit, Jest, Express.js, CakePHP, Redux, ThinkPHP, Chrome


React, jQuery, Node.js, Backbone.js, Vue, MooTools, Socket.IO, MobX


WordPress, Linux, MacOS, Firebase, Amazon Web Services (AWS), Visual Studio Code (VS Code), Docker


JSON, Memcached, MySQL, MongoDB, Redis, SQLite


Front-end, Bootstrap UI, Ajax, Front-end Development, Software Development, Cordova, Bitcoin, WebSockets, DOM, PIP, Machine Learning, SOAP, HTTP, CPA, WYSIWYG Web Builders, Business Administration


Git, Gulp, Webpack, Apache, NPM, Grunt, Composer, JSX, Sublime Text, Babel, NGINX


Model View Controller (MVC), Agile Software Development, PHP Standards Recommendations (PSR), Functional Programming, Model View Presenter (MVP), REST

2002 - 2006

Bachelor's Degree in Business Administration

Southwestern University of Finance and Economics - Chengdu, China


AWS Solutions Architect Associate

Amazon Web Services, Inc.