If you want to hire Vue.js developers, you need to assess their skills before hiring them. The most important skills are the following:
Knowledge of the Vue.js framework
Knowledge of Javascript ES6 + ECMAScript 2015 standards and TypeScript
Experience with Vuex
Ability to write HTML, CSS, and JavaScript code
Understanding of CSS preprocessors (Sass and Less / Stylus)
Experience with Gulp / Webpack
Git and GitFlow skills
Knowledge of refactoring, code smells, and design patterns
Ability to write a test to assess the quality of features developed