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

Software Developer in Kunming, Yunnan, China

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.
William is now available for hire




Kunming, Yunnan, China



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.


  • 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.

  • Efficient React Components: A Guide to Optimizing React Performance (Publication)
    Why does a React web app run slow? The answer often lies in when and how frequently your components re-render, and whether those re-renders were even necessary. React doesn’t promise magical performance gains, but it provides just the right tools and functionalities to make it easy. In this article, Toptal Freelance Software Engineer William Wang walks us through some optimization techniques that can help you build performant React web apps.


  • Languages

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

    React Native, Lumen, Laravel, Slim, PHPUnit, Jest, Express.js, CakePHP, Redux, ThinkPHP, Chrome
  • Libraries/APIs

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

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

    JSON, Memcached, MySQL, MongoDB, Redis, SQLite
  • Other

    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
  • Tools

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

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


  • Bachelor's Degree in Business Administration
    2002 - 2006
    Southwestern University of Finance and Economics - Chengdu, China


  • AWS Solutions Architect Associate
    NOVEMBER 2019 - NOVEMBER 2022
    Amazon Web Services, Inc.

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