I'm a full stack developer specializing in mobile app (Android) and web development with experience in fulltime and freelance work for over 4 years. We could discuss together how to make better performance for your business and applying it through website & app. Some projects I had been involved in including making 2D game, ERP and backoffice system for companies and small bank, marketplace app, utilities app, e-learning app, and some landing page websites.
Some key technologies that I've used during my experience:
Android: basic components, sqlite database, networking library, firebase, google play services
Web: PHP frameworks (Laravel, Yii2, and CodeIgniter), REST API
Database: relational database, triggers, stored procedure
UI/UX: responsive design, wireframing, use case, and design sprint method