Samuel – .NET, .NET Core, C#

The payments microservices of the McDonald's global mobile app to manage customer cards, payment methods, and sales transactions with PSPs and integrate with fraud service providers (FSPs).

• Designed and implemented new payment methods integration;
• Created new queues and consumers for SQL data migration in AWS SQS;
• Updated a version of payment provider integration;
• Worked on troubleshooting and providing hotfixes for production issues;
• Developed unit tests with XUnit and end-to-end integration tests using Cypress;
• Refactored code for SonarQube compliance;
• Provided support for production deployments by monitoring prod transactions, logs, and performance;
• Collaborated with cross-functional teams.

It's a SaaS for digital hiring in Brazil that collects employee data and documents via OCR and integrates them with popular payroll systems.

• Optimized the back end by refactoring code and adding caching to boost response time;
• Designed and provided technical analysis for new features implementation;
• Incorporated payroll system integrations such as SAP and TOTVS;
• Delivered bug fixes and feature enhancements for the Angular front end.

It's a medical certificate emission system to be used by medical centers across Espírito Santo state in Brazil.

• Built the back end and front end of the medical certificate system from scratch;
• Delivered bug fixes for a legacy system built with WebForms and jQuery;
• Created unit tests to ensure code reliability;
• Handled project deployment using Microsoft Azure.

It's the company responsible for developing and maintaining city hall's public systems. The projects included user authentication and pet adoption systems.

• Added new features to the authentication system used by all city hall services;
• Delivered bug fixes and new features for a public pet adoption system;
• Set up a data replication system between databases using RabbitMQ queues.

It's a Brazilian bank offering financial solutions for customers and local companies in Paraná and Rio Grande do Sul states.

• Improved an ASP.NET application for managing customer credit cards with bug fixes and new features;
• Contributed to migrating a legacy application to .NET Core;
• Built a full-stack project from scratch with React and .NET Core;
• Integrated Google Maps API and PostgreSQL geolocation queries to find nearby stores for customers;
• Created unit tests using XUnit and NUnit frameworks.