I reimplemented the web service originally written in PHP into a new web service written in Java with the Spring Boot framework.
I added the notion of security with Spring Security.

Presence control system with SMS notifications. Developed on the basis of the ZK Téco sdk.
Tools: Visual studio 2017, MYSQL, OZEKISMS, WPF, .Net framework, SDK ZK, ...

It is a REST API, written according to the Codeigniter framework model.
This web service makes it possible to provide the resources for a marketplace which is accessible via mobile terminals in general.

it therefore integrates all the resources to manage the operations of:
Creation of products, orders, delivery, inventory management, activity analysis, group management, ...

Exchange platform for supplier - seller. Management of commercial activities (sales, stock, orders, auction, publication of service, promotion of products). It also offers an optimization mode for order management ...
Tools: Visual studio 2017/2019, Xamarin.forms (Android / IOS / UWP), Nuget, Syncfusion UI KIT, Firebase, MVVM, Xaml, ...

Automated tracking system. Based on J2ee.
Tools: Glassfish server, Gisgraphy, Geoserver, POSTGIS, OzekiSMS, ...