Dedicated MEAN stack developers have certified skills in NodeJS and ExpressJS: npm, REST, CRUD, Gulp, Grunt, Socket.io, and Node.js multi-processing skills. They must be savvy in AngularJS: knowledge of the Bootstrap grid system, TypeScript, dependency injection, SPAs, pipelines, and testing. For backend engineering, they also need to know MongoDB: for ingestion, querying, data modeling, replication, and sharding. Besides, they should be familiar with the fundamentals of JavaScript, CSS, HTML, GIT, and DevOps.