My specialization : - create Back-End ( Java / PHP ) with API Documentation too. for API Documentation, i usually use Swagger UI. - create a SPA ( Single Page Application ) using Angular, if you already have mockup, i can convert it into Web App. - create a Mobile Apps ( Ionic ) which is similar with the Web App version, advantages if using Ionic is you can force user who access your page use mobile phones to open your Mobile-Web App version.