Created various RESTful APIs using NestJS with microservices architecture for credit card core management. Implemented unit and end-to-end tests for all endpoints. Improved credit card core response time by 90%.

Developed RESTful APIs (80% PHP, 20% Golang) for event handling, registration, login, and social features. Migrated SQL Server database to Amazon DynamoDB. Created modular libraries improving code reusability by 70%. Led development of an application for articles, blogs, and podcasts, increasing publication performance by 90%.

Developed new features for an electronic invoicing application for the Ministry of Finance. Improved synchronization system between local billing and the ministerial communication interface, enhancing code quality by 65%.

Created RESTful API with full CRUD functionality and Active Directory authentication for shelf inventory management. Assisted in developing an application for precise shelf inventory auditing and integrated various Walmart ecosystem technologies.

Migrated application from .NET to PHP. Developed new libraries and functions to improve end-user experience. Built RESTful API for inter-system data exchange, improving reporting and data exchange efficiency by 80%.

Developed modules and processes for Banca2000 core banking system. Participated in data and system migration from Oracle Forms & Reports 6i to 11g. Performed reengineering of the Ascel/x insurance system, developing new modules and PL/SQL code which increased sales and case resolution speed.