Mark Johnson

- Acted as a Full Stack developer in a 30+ dev team for 2 years - Improved UI/UX with React, Node, styled-components, d3.js, TradingView - Developed and improved performance of +10 animation effects with custom styling - Simplified global state management by using Mobx - Suggested and Integrated real-time communication mechanism with Socket.IO and ws(npm package)

- Built RESTful APIs for Mozart Image processing, DICOM image processing, study APIs, user management - Implemented application authentication system with MFA (Multi- Factor Authentication) - Used PostgreSQL for system database, knexjs for SQL query builder in Node.js - Managed Amazon S3 bucket to store study cases and DICOM image resources - Add Flow (which is similar to TypeScript) and StandardJS flow type checking and style linting of the codebase - Unit tested for all APIs using Sinon, Jest and Mocha

- Upgraded architecture of an enterprise clothing platform React, Node, MongoDB, Firebase (+7% improved in a number of requests per second) - Developed headless CRM by using Strapi, Node, and React - Redesigned database MySQL to MongoDB - Developed price analysis platform depend on Price API and Google Merchant API with React and .Net - Set up and administered a continuous integration systembased on CruiseControl.NET, including nightly builds with unit tests run and delivery to the test servers.

- Launched a Team Management CRM platform with jQuery, Node, Firebase, Salesforce and Twilio API - Integrated Socket.IO for real-time team collaboration using NodeJS - Developed chrome extension app for video conferencing by using WebRTC and Socket.IO

- Implemented and maintained the user-facing part of the system using PHP and Symfony 2 for the back-end and a custom made JS framework for the front-end. - Created a Node.js notification server and front-end client that uses WebSockets to distribute notifications. - Implemented most of the site's back-end for user statistics, affiliate tracking, system, data, user management, and maintenance. - Implemented a crawler and automatic page tester for the website using Node.js