Douglas Felchilcher Email & Phone Number

Palmitos, Santa Catarina, Brazil

• Responsible for designing a solution for the company that wants to have a new front-end and new mobile applications. Thinking about code reuse, I created private npm repositories for the UI Kit, utilities, and entities with the company's business rules. The repositories will be consumed by both the React front-end and React Native applications. All projects are being built using Typescript, Clean Architecture, automated tests, and CI/CD.• I am currently building a new sales application using Expo Bare Workflow, React Native, Typescript, Expo Router, React Hook Form, Zod, React Query, emotion, and SQLite. The application will have features that require synchronization, offline work, location capture, printing, signing, barcode and QR code scanning, attachments, and charts.

• I was responsible for implementing payment methods in the company's mobile applications, which were developed in React Native, using styled-components, React Hook Form, and Typescript. In some cases, I needed to create native modules for communication with the SDKs and, in others, I used Deeplink. I also implemented the entire communication process, where it was necessary to develop an HTTP or socket method switch in the microservice responsible for communication between the company's applications, to meet the particularities of each payment method. This API was created in Node.Js with Typescript, and I used Clean Architecture in the solution. The entire process was covered with unit tests. In the mobile apps and the Node.js API, I used Jest, and in the backend of the web application that uses PHP, I used PHPUnit. This was a feature that resellers were eagerly awaiting, and it was a success, transacting millions of reais in a few days, increasing sales and customer satisfaction.• I developed a feature for importing invoices in XML file format, which serialized the data and displayed it first on the front end, for linking internal codes and converting units of measurement values. When saving, the data was sent to the PHP backend, which persisted the main transaction data in a Postgres database, and sent some events, such as inventory changes, to the microservice responsible for the queue service, written in Go, which communicated with RabbitMQ. Other microservices consumed this queue, such as the microservice responsible for generating and storing files, written in Node.Js, which received the transaction XML and sent it to a Bucket in AWS.

Palmitos - Sc

• Co-founder and leader of the development team, I built Online ERP Cloud from scratch, a complete cloud management platform, using PHP, Bootstrap, Javascript, Ajax, JQuery, MySQL database, and several other applications that integrate it, such as a virtual store, customer center, sales application, point of sale, which was the solution for offline access, developed in Java, with a Postgres database.• I was also responsible for maintaining the servers, which were initially on-premises Linux servers, and were later transferred to cloud services, where AWS and Azure solutions were used.• We built a complete solution for reading water consumption, where the application took the reading at the locations, at the time of capture, the area was marked and sent along with the customer's information to the backend, which processed it, generated the invoice, and sent it to the customer, who could track it in a customer center.• I built a complete solution for auto repair shops. It included scheduling and initial vehicle registration. When the person in charge of the service arrived at the shop, they collected information about the vehicle and took photos and videos on their cell phone. After that, the mechanic, using their cell phone or touch screen at the company, had access to the initial data and launched the diagnosis. When it was ready, a message was sent to those responsible for the budget, who automatically sent it to several suppliers asking for quotes, and then sent it to the customer. It also included an output report, photos, and videos for comparison with the input, billing, financial, and satisfaction survey, and a customer center for follow-up.

Palmitos Sc

• This is where I began my career and became a specialist in technical support for information technology. I was responsible for technical support teams.• I specialized in hardware and software maintenance, networks, installation, and configuration of Linux and Windows Server servers, with web services (Apache), databases (MySQL), firewalls, DNS, email, FTP, SSH, and others.• Also where I had my first contact with website and software development. I developed websites and small applications using HTML, CSS, PHP, Javascript, and MySQL.