Backend development of authentication services, using the technologies bellow:- Customer Identity and Access Management (CIAM) platform.- OAuth2 protocol.- WebAuthn and FIDO2.

Backend development of a Certificate Authority which is a platform responsible to issue digital certificates.- Communication with hardware security module (HSM) and Tokens/Smartcards via PKCS11.- Communication with Tokens/Smartcards via Microsoft CryptoAPI (MS CAPI).- Generation of cryptographic keys (RSA and ECC).- Generation of certificate signing request (CSR), certificate and attribute certificate (X509).- Generation of revocation list (CRL), and OCSP request and response.

Backend development for different cases:- A C# serial communication module implementation to secure the communication between a client and server.- A C# system implementation to communicate with the computer TPM module and secure the stored cryptography keys.- An ASP.NET Web API implementation for key generation and interaction with the system cited before.- A Java module implementation for signing and timestamping PDFs.- A desktop application for signing digital documents like university degrees and course certificates, this time developing the frontend and the backend using Java and JavaFx.

Backend development of a web platform to support appointment scheduling, and helps a government project which makes appointments for patients who cannot consult in their city. In that project was utilized a brazilian framework called Scriptcase which integrates Bootstrap and the PHP language for developing web applications.

Backend development of an air quality monitoring platform, using Java for implementing RESTful web services interacting with a MySQL database.

Backend development for games in the Windows platform using Unity framework and the C# program language.