I am passionate about programming professional web and mobile applications with React, and Flutter, on top of custom build web servers with Express, GraphQL and ArangoDB. What Can I do? > Consume or secure RESTful & GraphQL APIs Build from scratch > Build Full Stack applications with React, NodeJs, Express, ArangoDB > Build secure user management systems (user login management with username/passwor/token, logout, password reset...) > Build efficient multi level marketing platforms with diagrams, sales and points (volumes) management, automatic earnings dispatch ... > Build and publish Hybrid, Native Full Stack Mobile applications with Flutter and Dart > Build automated billing or payment systems based on the Bitcoin technology...