Conceptualization and development of a multi-tenant project focused on managing benefits cards for employees of medium and large companies, making it easier for our clients to provide benefits such as meal vouchers, food allowances, education assistance, mobility, leisure, and more.In this project, we used AWS Lambda, along with AWS SQS for queues and SNS for notifications. We also utilized Amazon S3 for storage and SES for message sending.We adopted the CQRS pattern due to the use of multiple databases, which proved advantageous by segregating responsibilities. Additionally, we applied Clean Architecture and aimed for high decoupling, considering the diversity of clients and integrations. In terms of testing, we implemented unit tests with good coverage, complemented by integration tests.For observability, we used Grafana in conjunction with Prometheus for monitoring. For log management, we employed the ELK Stack (Elasticsearch, Logstash, Kibana). For distributed tracing, we adopted AWS X-Ray.

Development and maintenance of a medical data and consultation management system, built entirely with Lambda Functions. The system included features such as appointment scheduling, health questionnaires, integrations with other medical systems, and subscription and consultation payment management. We implemented the CQRS pattern alongside the Ports and Adapters architecture, ensuring a high level of decoupling and flexibility. We used Jest for unit testing, adopting TDD practices to ensure code quality and functional reliability.

Backend development in Node.js for the startup "Quando Eu Partir," a platform focused on End-of-Life, designed to store and share users' most sensitive information with their families. Given the sensitive nature of the data, we implemented comprehensive security measures, including both symmetric and asymmetric encryption. This ranged from encrypting data in transit, using handshakes, to securing the database with AES-256 encryption. The encryption logic was inspired by digital password vault systems.The system was entirely built using Lambda Functions, a strategic choice to optimize costs, as the platform wouldn’t be used constantly by users. We also utilized various AWS services, such as Cognito, Secret Manager, SQS, S3, CodeBuild, and KMS. To ensure a flexible and maintainable architecture, we adopted the hexagonal model (ports and adapters). We used Jest for unit testing to ensure that the system's logic remained intact during code changes and refactors. PostgreSQL was chosen as the database, and we also integrated with payment systems to manage monthly and annual subscription plans.

Backend development in Node.js for an internal recruitment and selection platform at South System. The project involved creating a BFF (Backend for Frontend) in Node.js to integrate and leverage existing Java services, adapting them to the new solution. We chose the Nest.js framework due to its built-in tools and conveniences, which accelerated the development of new features. The project structure was meticulously organized, following best practices recommended by the community and based on the official framework documentation.

Development of a food delivery platform that served major brands like Burger King, McDonald's, Giraffas, and Outback. Our solution acted as an intermediary between these clients and delivery platforms like iFood, Uber Eats, and Rappi, offering a fully automated web platform integrated with various partners. This solution significantly simplified the order management process for retailers, providing greater efficiency and organization.

A sport-tech platform focused on soccer and futsal, where we've developed a product that enables and facilitates integration among teams, players, tournaments, and scouts. This platform streamlines real-time match integration, featuring a dashboard for users to follow games. At the end of each match, players can evaluate themselves.The system was developed using best practices, adhering to design standards, and emphasizing backend unit testing. We utilized Supertest for interface testing. We had two services: one for player management and another for tournament management. The system was built in node.JS using RabbitMQ, Typescript, and Socket.IO for real-time match updates.For the mobile application, we used React Native for swift development, as it was widely adopted in the market, expediting development and delivery processes. Styled-Components were employed for CSS, ContextAPI for context control, and various input validation libraries to streamline app development.

Strong performance with Node.js, and its methodologies, always looking for the best pattern for the project for high scalability and better maintenance. Development of an API for the client Corsan (water treatment plant) that consumed data from a SAP service, where we took the tasks of the street technicians, treated this data and returned it to a mobile application, in this system it was possible to carry out the entire operation of a service , from the customer's order, with addresses, type of faults, how much material management that the technician had and could use, upload of images and PDF files and an order completion email trigger system.

- Development in a WEB and Mobile platform that managed food deliveries, where we could monitor the order and orders of customers and food delivery boy. System developed in: Node.Js, MongoDB using the Express framework, use of integration tests, following the MVC pattern.- Development of a platform for management of driving schools franchises, where it was possible to carry out the entire process from registering a new driver and payments, issuing results. Platform built in Node, Js, Express, TDD, Typescript following the Modules pattern.

Maintenance of the company's CMS system, which focused on marketing and improving customer traffic, providing services to different customers, Faders, Unirriter, Egali, etc... Developed in Node.Js React.Js and relational database (Postgres).

Acting in the development of freelance projects, in different clients and segments, using technologies such as PHP, MySQL, HTML, SCSS, React, Vue