Mandate : NestJS, Microservices, MongoDB and MysqlExpert in advanced JavaScript, strong coding proficiency with Node.js, Express, and JavaScript.Understanding the nature of asynchronous programming and its quirks and workarounds.Proficiency and hands-on experience with one or more of the following : Backbone / KnockoutJS / EmberJS / ReactJS / AngularJSWorking knowledge of Promises, callback hell, and ways to avoid it.Experience with real-time technologies like engine.io, and socket.io (preferred)AWS experience including EC2, SQS, SNS, Lambda, and API Gateway a plusFamiliarity with database technologies such as SQL Server, NoSQL, etc.Familiarity with cloud message APIs and push notificationsRestful web services, service-oriented architecturesExperience with threading, and performance tuningUnderstanding differences between multiple delivery platforms, such as mobile vs. desktop, and optimizing output to match the specific platformUnderstanding fundamental design principles behind a scalable application.